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[原创]看雪 2022·KCTF 春季赛 > 第五题 危机四伏 by 心学
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发表于: 2022-6-12 21:16 13014
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日期：2022-06-12
CTF：htg
题目：看雪 2022·KCTF 春季赛 > 第五题 危机四伏
工具：IDA、Windbg
要点：C++异常处理机制、32与64bit代码切换、代码混淆
【C++反汇编与逆向分析技术揭秘】
在X64系统下的进程有32位和64位两种工作模式，这两种工作模式的区别在于CS寄存器。32模式时，CS=0x23；64位模式时，CS=0x33。
这两种工作模式可以进行切换，一般通过retf指令。retf指令等效于2条汇编指令pop ip、pop cs。
如果此时栈中有0x33，则会将0x33弹出到CS寄存器中，实现32位程序切换到64位代码的过程。反之，如果栈中有0x23，将0x23弹出到CS寄存器，则实现64位程序切换到32位代码的过程。
识别32位、64位工作模式切换的两个标志：
（1）出现retf、0x23或0x33。
（2）使用类似call fword的远处调用，譬如call fword ptr [ebp-0xC]。
无法F5转换C伪代码
建立主函数的异常处理结构体
运行调试后，出现了异常，无法继续进行。
分析模式切换的代码，搞清楚32转64,64转32的执行机制，以及代码切换位置
##############################################################
定位关键的位置，找出运行成功前的所有分支判断
【起始阶段】全局变量初始值
【数据分析】初始值
【第一阶段】解密
bp 00401E94; ecx 存储 解密地址
bp 00401E99; 使用 IDC 执行
////////////////////////////////////////////【ecx 修改】begin
////////////////////////////////////////////
【第一阶段】全局变量
bp 00401F0D;
////////////////////////////////////////////
////////////////////////////////////////////
【数据分析】第一阶段执行之后
////////////////////////////////////////////
////////////////////////////////////////////
【第二阶段】解密
bp 00401F9C; ecx 存储 解密地址
bp 00401FA1;
////////////////////////////////////////////【ecx 修改】begin
////////////////////////////////////////////
【第二阶段】全局变量
bp 00401FF9;
////////////////////////////////////////////
////////////////////////////////////////////
【数据分析】第二阶段执行之后
////////////////////////////////////////////
////////////////////////////////////////////
【第三阶段】解密
bp 004020CE; ecx 存储 解密地址
bp 004020D3;
////////////////////////////////////////////【ecx 修改】begin
////////////////////////////////////////////
////////////////////////////////////////////
【第三阶段】全局变量
bp 00402194;
////////////////////////////////////////////
【数据分析】第三阶段执行之后
对dump出来的三处代码，分别进行分析，去除混淆，理清主要的加密机制
回顾代码，理清题目的主体结构。
（未完待续）
（未完待续）
.rdata:00427050 FuncInfo1 FuncInfo <19930522h, 19h, offset stru_427078, 0Ch, offset stru_427140,\
.rdata:00427050 ; DATA XREF: .text:0041C000↑o
.rdata:00427050 0, 0, 0, 1>
#############################.rdata:00427140 stru_427140 TryBlockMapEntry <1, 1, 2, 2, offset stru_427230> __msRttiDscr <9, 00892A20, 0, 401D04h>
.rdata:00427140 ; DATA XREF: .rdata:FuncInfo1↑o
.rdata:00427140 TryBlockMapEntry <7, 7, 8, 1, offset stru_427230.nFlag+20h> __msRttiDscr <0, 00892A10, 0FFFFFD10h, 401F6Eh>
.rdata:00427140 TryBlockMapEntry <9, 9, 0Ah, 1, offset stru_427230.nFlag+30h> __msRttiDscr <9, 00892A20, 0, 401FEEh>
.rdata:00427140 TryBlockMapEntry <0Dh, 0Dh, 0Eh, 1, offset stru_427230.nFlag+40h> __msRttiDscr <9, 00892A20, 0, 4020D8h>
.rdata:00427140 TryBlockMapEntry <0Bh, 0Bh, 0Eh, 1, offset stru_427230.nFlag+50h> __msRttiDscr <0, 008929FC, 0FFFFFCC8h, 402089h>
.rdata:00427140 TryBlockMapEntry <13h, 13h, 14h, 1, offset stru_427230.nFlag+60h> __msRttiDscr <9, 00892A20, 0, 402211h>
.rdata:00427140 TryBlockMapEntry <11h, 11h, 14h, 1, offset stru_427230.nFlag+70h> __msRttiDscr <0, 00892A3C, 0FFFFFD4Fh, 4021D2h>
.rdata:00427140 TryBlockMapEntry <17h, 17h, 18h, 2, offset stru_427230.nFlag+80h> __msRttiDscr <9, 00892A20, 0, 402321h>
.rdata:00427140 TryBlockMapEntry <15h, 15h, 18h, 1, offset stru_427230.nFlag+0A0h> __msRttiDscr <0, 008929C4, 0FFFFFCD0h, 402289h>
.rdata:00427140 TryBlockMapEntry <0Fh, 0Fh, 18h, 1, offset stru_427230.nFlag+0B0h> __msRttiDscr <0, 008929FC, 0FFFFFCC4h, 40213Ch>
.rdata:00427140 TryBlockMapEntry <5, 5, 18h, 1, offset stru_427230.nFlag+0C0h> __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh>
.rdata:00427140 TryBlockMapEntry <3, 3, 18h, 1, offset stru_427230.nFlag+0D0h> __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h>
throw 会找到 __msRttiDscr ，可能存在多个同样的，如何区分了，查看 tryLow、tryHight、catchHigh进行比对，就是看作用域#############################.rdata:00427230 stru_427230 __msRttiDscr <9, 00892A20, 0, 401D04h> //class std::exception
.rdata:00427230 ; DATA XREF: .rdata:stru_427140↑o
.rdata:00427230 __msRttiDscr <0, 008929F0, 0FFFFFCC0h, 401DACh> //int `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 00892A10, 0FFFFFD10h, 401F6Eh> //unsigned char * `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 401FEEh> //class std::exception
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 4020D8h> //class std::exception
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCC8h, 402089h> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402211h> //class std::exception
.rdata:00427230 __msRttiDscr <0, 00892A3C, 0FFFFFD4Fh, 4021D2h> //bool `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402321h> //class std::exception
.rdata:00427230 __msRttiDscr <40h, 0, 0, 402349h> //
.rdata:00427230 __msRttiDscr <0, 008929C4, 0FFFFFCD0h, 402289h> //void * `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCC4h, 40213Ch> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h> //unsigned char * `RTTI Type Descriptor'
#############################.data:00892A20 ; public class std::exception /* mdisp:0 */
.data:00892A20 ; class std::exception `RTTI Type Descriptor'
.data:00892A20 ??_R0?AVexception@std@@@8 dd offset off_41D184
.data:00892A20 ; DATA XREF: .rdata:00426CA0↑o
.data:00892A20 ; .rdata:std::exception::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A20 ; reference to RTTI's vftable
.data:00892A24 dd 0 ; internal runtime reference
.data:00892A28 aAvexceptionStd db '.?AVexception@std@@',0 ; type descriptor name
#############################.data:008929F0 ; int `RTTI Type Descriptor'
.data:008929F0 ??_R0H@8 dd offset off_41D184 ; DATA XREF: .rdata:004279F4↑o
.data:008929F0 ; reference to RTTI's vftable
.data:008929F4 dd 0 ; internal runtime reference
.data:008929F8 db '.H',0 ; type descriptor name
#############################.data:00892A10 ; unsigned char * `RTTI Type Descriptor'
.data:00892A10 ??_R0PAE@8 dd offset off_41D184 ; DATA XREF: .rdata:0042793C↑o
.data:00892A10 ; reference to RTTI's vftable
.data:00892A14 dd 0 ; internal runtime reference
.data:00892A18 aPae db '.PAE',0 ; type descriptor name
.data:00892A1D align 10h
#############################.data:008929FC ; void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.data:008929FC ??_R0P6AXPAE@Z@8 dd offset off_41D184 ; DATA XREF: .rdata:00427958↑o
.data:008929FC ; reference to RTTI's vftable
.data:00892A00 dd 0 ; internal runtime reference
.data:00892A04 aP6axpaeZ db '.P6AXPAE@Z',0 ; type descriptor name
#############################.data:00892A3C ; bool `RTTI Type Descriptor'
.data:00892A3C ??_R0_N@8 dd offset off_41D184 ; DATA XREF: .rdata:00427A10↑o
.data:00892A3C ; reference to RTTI's vftable
#############################.data:008929C4 ; void * `RTTI Type Descriptor'
.data:008929C4 ??_R0PAX@8 dd offset off_41D184 ; DATA XREF: .rdata:00427910↑o
.data:008929C4 ; reference to RTTI's vftable
.data:008929C8 dd 0 ; internal runtime reference
.data:008929CC aPax db '.PAX',0 ; type descriptor name
##########################################################.data:008929A4 ; public class std::bad_exception /* mdisp:0 */ :
.data:008929A4 ; public class std::exception /* mdisp:0 */
.data:008929A4 ; class std::bad_exception `RTTI Type Descriptor'
.data:008929A4 ??_R0?AVbad_exception@std@@@8 dd offset off_41D184
.data:008929A4 ; DATA XREF: FindHandler<__FrameHandler3>(EHExceptionRecord *,EHRegistrationNode *,_CONTEXT *,void *,_s_FuncInfo const *,uchar,int,EHRegistrationNode *)+116↑o
.data:008929A4 ; .rdata:00426C54↑o ...
.data:008929A4 ; reference to RTTI's vftable
.data:008929A8 dd 0 ; internal runtime reference
.data:008929AC aAvbadException db '.?AVbad_exception@std@@',0 ; type descriptor name
.data:008929C4 ; void * `RTTI Type Descriptor'
.data:008929C4 ??_R0PAX@8 dd offset off_41D184 ; DATA XREF: .rdata:00427910↑o
.data:008929C4 ; reference to RTTI's vftable
.data:008929C8 dd 0 ; internal runtime reference
.data:008929CC aPax db '.PAX',0 ; type descriptor name
.data:008929D1 align 4
.data:008929D4 ; public class std::bad_alloc /* mdisp:0 */ :
.data:008929D4 ; public class std::exception /* mdisp:0 */
.data:008929D4 ; class std::bad_alloc `RTTI Type Descriptor'
.data:008929D4 ??_R0?AVbad_alloc@std@@@8 dd offset off_41D184
.data:008929D4 ; DATA XREF: .rdata:std::bad_alloc::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o
.data:008929D4 ; .rdata:00426D20↑o ...
.data:008929D4 ; reference to RTTI's vftable
.data:008929D8 dd 0 ; internal runtime reference
.data:008929DC aAvbadAllocStd db '.?AVbad_alloc@std@@',0 ; type descriptor name
.data:008929F0 ; int `RTTI Type Descriptor'
.data:008929F0 ??_R0H@8 dd offset off_41D184 ; DATA XREF: .rdata:004279F4↑o
.data:008929F0 ; reference to RTTI's vftable
.data:008929F4 dd 0 ; internal runtime reference
.data:008929F8 db '.H',0 ; type descriptor name
.data:008929FB align 4
.data:008929FC ; void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.data:008929FC ??_R0P6AXPAE@Z@8 dd offset off_41D184 ; DATA XREF: .rdata:00427958↑o
.data:008929FC ; reference to RTTI's vftable
.data:00892A00 dd 0 ; internal runtime reference
.data:00892A04 aP6axpaeZ db '.P6AXPAE@Z',0 ; type descriptor name
.data:00892A0F align 10h
.data:00892A10 ; unsigned char * `RTTI Type Descriptor'
.data:00892A10 ??_R0PAE@8 dd offset off_41D184 ; DATA XREF: .rdata:0042793C↑o
.data:00892A10 ; reference to RTTI's vftable
.data:00892A14 dd 0 ; internal runtime reference
.data:00892A18 aPae db '.PAE',0 ; type descriptor name
.data:00892A1D align 10h
.data:00892A20 ; public class std::exception /* mdisp:0 */
.data:00892A20 ; class std::exception `RTTI Type Descriptor'
.data:00892A20 ??_R0?AVexception@std@@@8 dd offset off_41D184
.data:00892A20 ; DATA XREF: .rdata:00426CA0↑o
.data:00892A20 ; .rdata:std::exception::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A20 ; reference to RTTI's vftable
.data:00892A24 dd 0 ; internal runtime reference
.data:00892A28 aAvexceptionStd db '.?AVexception@std@@',0 ; type descriptor name
.data:00892A3C ; bool `RTTI Type Descriptor'
.data:00892A3C ??_R0_N@8 dd offset off_41D184 ; DATA XREF: .rdata:00427A10↑o
.data:00892A3C ; reference to RTTI's vftable
.data:00892A40 dd 0 ; internal runtime reference
.data:00892A44 aN db '._N',0 ; type descriptor name
.data:00892A48 ; public class std::bad_array_new_length /* mdisp:0 */ :
.data:00892A48 ; public class std::bad_alloc /* mdisp:0 */ :
.data:00892A48 ; public class std::exception /* mdisp:0 */
.data:00892A48 ; class std::bad_array_new_length `RTTI Type Descriptor'
.data:00892A48 ??_R0?AVbad_array_new_length@std@@@8 dd offset off_41D184
.data:00892A48 ; DATA XREF: .rdata:00426D54↑o
.data:00892A48 ; .rdata:std::bad_array_new_length::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A48 ; reference to RTTI's vftable
.data:00892A4C dd 0 ; internal runtime reference
.data:00892A50 aAvbadArrayNewL db '.?AVbad_array_new_length@std@@',0 ; type descriptor name
.data:00892A6F align 10h
.data:00892A70 ; public class type_info /* mdisp:0 */
.data:00892A70 ; class type_info `RTTI Type Descriptor'
.data:00892A70 ??_R0?AVtype_info@@@8 dd offset off_41D184
.data:00892A70 ; DATA XREF: .rdata:00426C0C↑o
.data:00892A70 ; .rdata:type_info::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o
.data:00892A70 ; reference to RTTI's vftable
.data:00892A74 dd 0 ; internal runtime reference
.data:00892A78 aAvtypeInfo db '.?AVtype_info@@',0 ; type descriptor name
.rdata:00427050 FuncInfo1 FuncInfo <19930522h, 19h, offset stru_427078, 0Ch, offset stru_427140,\
.rdata:00427050 ; DATA XREF: .text:0041C000↑o
.rdata:00427050 0, 0, 0, 1>
#############################.rdata:00427140 stru_427140 TryBlockMapEntry <1, 1, 2, 2, offset stru_427230> __msRttiDscr <9, 00892A20, 0, 401D04h>
.rdata:00427140 ; DATA XREF: .rdata:FuncInfo1↑o
.rdata:00427140 TryBlockMapEntry <7, 7, 8, 1, offset stru_427230.nFlag+20h> __msRttiDscr <0, 00892A10, 0FFFFFD10h, 401F6Eh>
.rdata:00427140 TryBlockMapEntry <9, 9, 0Ah, 1, offset stru_427230.nFlag+30h> __msRttiDscr <9, 00892A20, 0, 401FEEh>
.rdata:00427140 TryBlockMapEntry <0Dh, 0Dh, 0Eh, 1, offset stru_427230.nFlag+40h> __msRttiDscr <9, 00892A20, 0, 4020D8h>
.rdata:00427140 TryBlockMapEntry <0Bh, 0Bh, 0Eh, 1, offset stru_427230.nFlag+50h> __msRttiDscr <0, 008929FC, 0FFFFFCC8h, 402089h>
.rdata:00427140 TryBlockMapEntry <13h, 13h, 14h, 1, offset stru_427230.nFlag+60h> __msRttiDscr <9, 00892A20, 0, 402211h>
.rdata:00427140 TryBlockMapEntry <11h, 11h, 14h, 1, offset stru_427230.nFlag+70h> __msRttiDscr <0, 00892A3C, 0FFFFFD4Fh, 4021D2h>
.rdata:00427140 TryBlockMapEntry <17h, 17h, 18h, 2, offset stru_427230.nFlag+80h> __msRttiDscr <9, 00892A20, 0, 402321h>
.rdata:00427140 TryBlockMapEntry <15h, 15h, 18h, 1, offset stru_427230.nFlag+0A0h> __msRttiDscr <0, 008929C4, 0FFFFFCD0h, 402289h>
.rdata:00427140 TryBlockMapEntry <0Fh, 0Fh, 18h, 1, offset stru_427230.nFlag+0B0h> __msRttiDscr <0, 008929FC, 0FFFFFCC4h, 40213Ch>
.rdata:00427140 TryBlockMapEntry <5, 5, 18h, 1, offset stru_427230.nFlag+0C0h> __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh>
.rdata:00427140 TryBlockMapEntry <3, 3, 18h, 1, offset stru_427230.nFlag+0D0h> __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h>
throw 会找到 __msRttiDscr ，可能存在多个同样的，如何区分了，查看 tryLow、tryHight、catchHigh进行比对，就是看作用域#############################.rdata:00427230 stru_427230 __msRttiDscr <9, 00892A20, 0, 401D04h> //class std::exception
.rdata:00427230 ; DATA XREF: .rdata:stru_427140↑o
.rdata:00427230 __msRttiDscr <0, 008929F0, 0FFFFFCC0h, 401DACh> //int `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 00892A10, 0FFFFFD10h, 401F6Eh> //unsigned char * `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 401FEEh> //class std::exception
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 4020D8h> //class std::exception
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCC8h, 402089h> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402211h> //class std::exception
.rdata:00427230 __msRttiDscr <0, 00892A3C, 0FFFFFD4Fh, 4021D2h> //bool `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402321h> //class std::exception
.rdata:00427230 __msRttiDscr <40h, 0, 0, 402349h> //
.rdata:00427230 __msRttiDscr <0, 008929C4, 0FFFFFCD0h, 402289h> //void * `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCC4h, 40213Ch> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh> //void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.rdata:00427230 __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h> //unsigned char * `RTTI Type Descriptor'
#############################.data:00892A20 ; public class std::exception /* mdisp:0 */
.data:00892A20 ; class std::exception `RTTI Type Descriptor'
.data:00892A20 ??_R0?AVexception@std@@@8 dd offset off_41D184
.data:00892A20 ; DATA XREF: .rdata:00426CA0↑o
.data:00892A20 ; .rdata:std::exception::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A20 ; reference to RTTI's vftable
.data:00892A24 dd 0 ; internal runtime reference
.data:00892A28 aAvexceptionStd db '.?AVexception@std@@',0 ; type descriptor name
#############################.data:008929F0 ; int `RTTI Type Descriptor'
.data:008929F0 ??_R0H@8 dd offset off_41D184 ; DATA XREF: .rdata:004279F4↑o
.data:008929F0 ; reference to RTTI's vftable
.data:008929F4 dd 0 ; internal runtime reference
.data:008929F8 db '.H',0 ; type descriptor name
#############################.data:00892A10 ; unsigned char * `RTTI Type Descriptor'
.data:00892A10 ??_R0PAE@8 dd offset off_41D184 ; DATA XREF: .rdata:0042793C↑o
.data:00892A10 ; reference to RTTI's vftable
.data:00892A14 dd 0 ; internal runtime reference
.data:00892A18 aPae db '.PAE',0 ; type descriptor name
.data:00892A1D align 10h
#############################.data:008929FC ; void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.data:008929FC ??_R0P6AXPAE@Z@8 dd offset off_41D184 ; DATA XREF: .rdata:00427958↑o
.data:008929FC ; reference to RTTI's vftable
.data:00892A00 dd 0 ; internal runtime reference
.data:00892A04 aP6axpaeZ db '.P6AXPAE@Z',0 ; type descriptor name
#############################.data:00892A3C ; bool `RTTI Type Descriptor'
.data:00892A3C ??_R0_N@8 dd offset off_41D184 ; DATA XREF: .rdata:00427A10↑o
.data:00892A3C ; reference to RTTI's vftable
#############################.data:008929C4 ; void * `RTTI Type Descriptor'
.data:008929C4 ??_R0PAX@8 dd offset off_41D184 ; DATA XREF: .rdata:00427910↑o
.data:008929C4 ; reference to RTTI's vftable
.data:008929C8 dd 0 ; internal runtime reference
.data:008929CC aPax db '.PAX',0 ; type descriptor name
##########################################################.data:008929A4 ; public class std::bad_exception /* mdisp:0 */ :
.data:008929A4 ; public class std::exception /* mdisp:0 */
.data:008929A4 ; class std::bad_exception `RTTI Type Descriptor'
.data:008929A4 ??_R0?AVbad_exception@std@@@8 dd offset off_41D184
.data:008929A4 ; DATA XREF: FindHandler<__FrameHandler3>(EHExceptionRecord *,EHRegistrationNode *,_CONTEXT *,void *,_s_FuncInfo const *,uchar,int,EHRegistrationNode *)+116↑o
.data:008929A4 ; .rdata:00426C54↑o ...
.data:008929A4 ; reference to RTTI's vftable
.data:008929A8 dd 0 ; internal runtime reference
.data:008929AC aAvbadException db '.?AVbad_exception@std@@',0 ; type descriptor name
.data:008929C4 ; void * `RTTI Type Descriptor'
.data:008929C4 ??_R0PAX@8 dd offset off_41D184 ; DATA XREF: .rdata:00427910↑o
.data:008929C4 ; reference to RTTI's vftable
.data:008929C8 dd 0 ; internal runtime reference
.data:008929CC aPax db '.PAX',0 ; type descriptor name
.data:008929D1 align 4
.data:008929D4 ; public class std::bad_alloc /* mdisp:0 */ :
.data:008929D4 ; public class std::exception /* mdisp:0 */
.data:008929D4 ; class std::bad_alloc `RTTI Type Descriptor'
.data:008929D4 ??_R0?AVbad_alloc@std@@@8 dd offset off_41D184
.data:008929D4 ; DATA XREF: .rdata:std::bad_alloc::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o
.data:008929D4 ; .rdata:00426D20↑o ...
.data:008929D4 ; reference to RTTI's vftable
.data:008929D8 dd 0 ; internal runtime reference
.data:008929DC aAvbadAllocStd db '.?AVbad_alloc@std@@',0 ; type descriptor name
.data:008929F0 ; int `RTTI Type Descriptor'
.data:008929F0 ??_R0H@8 dd offset off_41D184 ; DATA XREF: .rdata:004279F4↑o
.data:008929F0 ; reference to RTTI's vftable
.data:008929F4 dd 0 ; internal runtime reference
.data:008929F8 db '.H',0 ; type descriptor name
.data:008929FB align 4
.data:008929FC ; void (__cdecl *)(unsigned char *) `RTTI Type Descriptor'
.data:008929FC ??_R0P6AXPAE@Z@8 dd offset off_41D184 ; DATA XREF: .rdata:00427958↑o
.data:008929FC ; reference to RTTI's vftable
.data:00892A00 dd 0 ; internal runtime reference
.data:00892A04 aP6axpaeZ db '.P6AXPAE@Z',0 ; type descriptor name
.data:00892A0F align 10h
.data:00892A10 ; unsigned char * `RTTI Type Descriptor'
.data:00892A10 ??_R0PAE@8 dd offset off_41D184 ; DATA XREF: .rdata:0042793C↑o
.data:00892A10 ; reference to RTTI's vftable
.data:00892A14 dd 0 ; internal runtime reference
.data:00892A18 aPae db '.PAE',0 ; type descriptor name
.data:00892A1D align 10h
.data:00892A20 ; public class std::exception /* mdisp:0 */
.data:00892A20 ; class std::exception `RTTI Type Descriptor'
.data:00892A20 ??_R0?AVexception@std@@@8 dd offset off_41D184
.data:00892A20 ; DATA XREF: .rdata:00426CA0↑o
.data:00892A20 ; .rdata:std::exception::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A20 ; reference to RTTI's vftable
.data:00892A24 dd 0 ; internal runtime reference
.data:00892A28 aAvexceptionStd db '.?AVexception@std@@',0 ; type descriptor name
.data:00892A3C ; bool `RTTI Type Descriptor'
.data:00892A3C ??_R0_N@8 dd offset off_41D184 ; DATA XREF: .rdata:00427A10↑o
.data:00892A3C ; reference to RTTI's vftable
.data:00892A40 dd 0 ; internal runtime reference
.data:00892A44 aN db '._N',0 ; type descriptor name
.data:00892A48 ; public class std::bad_array_new_length /* mdisp:0 */ :
.data:00892A48 ; public class std::bad_alloc /* mdisp:0 */ :
.data:00892A48 ; public class std::exception /* mdisp:0 */
.data:00892A48 ; class std::bad_array_new_length `RTTI Type Descriptor'
.data:00892A48 ??_R0?AVbad_array_new_length@std@@@8 dd offset off_41D184
.data:00892A48 ; DATA XREF: .rdata:00426D54↑o
.data:00892A48 ; .rdata:std::bad_array_new_length::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o ...
.data:00892A48 ; reference to RTTI's vftable
.data:00892A4C dd 0 ; internal runtime reference
.data:00892A50 aAvbadArrayNewL db '.?AVbad_array_new_length@std@@',0 ; type descriptor name
.data:00892A6F align 10h
.data:00892A70 ; public class type_info /* mdisp:0 */
.data:00892A70 ; class type_info `RTTI Type Descriptor'
.data:00892A70 ??_R0?AVtype_info@@@8 dd offset off_41D184
.data:00892A70 ; DATA XREF: .rdata:00426C0C↑o
.data:00892A70 ; .rdata:type_info::`RTTI Base Class Descriptor at (0,-1,0,64)'↑o
.data:00892A70 ; reference to RTTI's vftable
.data:00892A74 dd 0 ; internal runtime reference
.data:00892A78 aAvtypeInfo db '.?AVtype_info@@',0 ; type descriptor name
GO_32_1:
//RET_32_1
__asm{
_emit 0E8h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 0C7h;
_emit 44h;
_emit 24h;
_emit 04h;
_emit 23h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 83h;
_emit 04h;
_emit 24h;
_emit 0Dh;
_emit 0CBh;
}
#这是一段 64 转 32 的代码.text:00401EFB
.text:00401EFB loc_401EFB:
.text:00401EFB E8 00 00 00 00 call $+5 ; Call Procedure /// 执行下一条指令。
.text:00401F00 C7 44 24 04 23 00 00 00 mov [esp+394h+var_390], 23h ; '#' /// windbg64 此时写入了 堆栈第二条：用于64转32
00000000`0019e9b8 00401f00 00000023
.text:00401F08 83 04 24 0D add [esp+394h+var_394], 0Dh ; Add /// windbg64 此时写入了 堆栈第一条：程序返回地址跳过retf，接续执行
00000000`0019e9b8 00401f0d 00000023
.text:00401F0C CB retf ; Return Far from Procedure
GO_32_1:
//RET_32_1
__asm{
_emit 0E8h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 0C7h;
_emit 44h;
_emit 24h;
_emit 04h;
_emit 23h;
_emit 00h;
_emit 00h;
_emit 00h;
_emit 83h;
_emit 04h;
_emit 24h;
_emit 0Dh;
_emit 0CBh;
}
#这是一段 64 转 32 的代码.text:00401EFB
.text:00401EFB loc_401EFB:
.text:00401EFB E8 00 00 00 00 call $+5 ; Call Procedure /// 执行下一条指令。
.text:00401F00 C7 44 24 04 23 00 00 00 mov [esp+394h+var_390], 23h ; '#' /// windbg64 此时写入了 堆栈第二条：用于64转32
00000000`0019e9b8 00401f00 00000023
.text:00401F08 83 04 24 0D add [esp+394h+var_394], 0Dh ; Add /// windbg64 此时写入了 堆栈第一条：程序返回地址跳过retf，接续执行
00000000`0019e9b8 00401f0d 00000023
.text:00401F0C CB retf ; Return Far from Procedure
unk_8934A0：g_sdunk_8934B9：g_sd_g_szSerialunk_8935D9：8个字节为0
unk_8995F1：0x10个字节与 用户名相等
8935D9 - 8934A0 = 139
8995F1 - 8934A0 = 6151
8934B9 - 8934A0 = 19
g_sd_g_szSerial：用户输入的序列号，32字节
##############################################################.text:00401406 68 8C 68 42 00 push offset aInputName ; "Input name:"
.text:0040140B E8 90 FC FF FF call sub_4010A0 ; Call Procedure
.text:00401410 83 C4 04 add esp, 4 ; Add
.text:00401413 BA 10 00 00 00 mov edx, 10h
.text:00401418 8D 4D D8 lea ecx, [ebp+Buf1] ; Buffer
.text:0040141B E8 70 FE FF FF call sub_401290 ; Call Procedure
.text:00401420 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401423 85 D2 test edx, edx ; Logical Compare
.text:00401425 75 21 jnz short loc_401448 ; Jump if Not Zero (ZF=0)
【Buf1】【局部变量】：用户输入的用户名.text:004014D0
.text:004014D0 loc_4014D0:
.text:004014D0 68 AC 68 42 00 push offset aInputKey ; "Input key:"
.text:004014D5 E8 C6 FB FF FF call sub_4010A0 ; Call Procedure
.text:004014DA 83 C4 04 add esp, 4 ; Add
.text:004014DD BA 40 00 00 00 mov edx, 40h ; '@'
.text:004014E2 8D 8D 70 FF FF FF lea ecx, [ebp+Buffer] ; Buffer
.text:004014E8 E8 A3 FD FF FF call sub_401290 ; Call Procedure
.text:004014ED 0F B6 C0 movzx eax, al ; Move with Zero-Extend
.text:004014F0 85 C0 test eax, eax ; Logical Compare
.text:004014F2 75 21 jnz short loc_401515 ; Jump if Not Zero (ZF=0)
【Buffer】【局部变量】：用户输入的序列号
.text:00401515
.text:00401515 loc_401515:
.text:00401515 33 C9 xor ecx, ecx ; Logical Exclusive OR
.text:00401517 89 4D B8 mov [ebp+var_48], ecx
.text:0040151A 89 4D BC mov [ebp+var_44], ecx
.text:0040151D 89 4D C0 mov [ebp+var_40], ecx
.text:00401520 89 4D C4 mov [ebp+var_3C], ecx
.text:00401523 89 4D C8 mov [ebp+var_38], ecx
.text:00401526 89 4D CC mov [ebp+var_34], ecx
.text:00401529 89 4D D0 mov [ebp+var_30], ecx
.text:0040152C 89 4D D4 mov [ebp+var_2C], ecx
######【ebp+var_48】【局部变量】【 unsigned char byteEnc[32] = { 0 };】.text:0040152F 8D 55 B8 lea edx, [ebp+var_48] ; Load Effective Address
.text:00401532 8D 8D 70 FF FF FF lea ecx, [ebp+Buffer] ; Load Effective Address
.text:00401538 E8 A3 FD FF FF call sub_4012E0 ; Call Procedure
######【ebp+var_48 = string2hex(szEnc)】【局部变量】【 string2hex(szEnc, byteEnc);】【此处是 16进制字符串 转 16进制】.text:0040153D 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401540 85 D2 test edx, edx ; Logical Compare
.text:00401542 75 21 jnz short loc_401565 ; Jump if Not Zero (ZF=0)
【第一个是将用户输入的 序列号 拷贝到了 全局变量 unk_8934B9 长度是 32 字节（转换之后），之前是64个字符。】
######【unk_8934B9】【输入 序列号】【memcpy(g_sd_g_szSerial, byteEnc, 32);】.text:00401565 loc_401565:
.text:00401565 B9 08 00 00 00 mov ecx, 8
.text:0040156A 8D 75 B8 lea esi, [ebp+var_48] ; Load Effective Address
.text:0040156D BF B9 34 89 00 mov edi, offset unk_8934B9
.text:00401572 F3 A5 rep movsd ; Move Byte(s) from String to String
【第二个是将内置的数据拷贝到了 全局变量】.text:00401574 C6 85 6C FD FF FF 95 mov [ebp+var_294], 95h
.text:0040157B C6 85 6D FD FF FF E2 mov [ebp+var_293], 0E2h
.text:00401582 C6 85 6E FD FF FF 80 mov [ebp+var_292], 80h
.text:00401589 C6 85 6F FD FF FF C6 mov [ebp+var_291], 0C6h
.text:00401590 C6 85 70 FD FF FF EA mov [ebp+var_290], 0EAh
.text:00401597 C6 85 71 FD FF FF C3 mov [ebp+var_28F], 0C3h
………………………………………………………………………………………………………………………………………………………………………….text:00401C58 C6 85 68 FE FF FF CF mov [ebp+var_198], 0CFh
.text:00401C5F C6 85 69 FE FF FF AE mov [ebp+var_197], 0AEh
.text:00401C66 C6 85 6A FE FF FF 8B mov [ebp+var_196], 8Bh
.text:00401C6D C6 85 6B FE FF FF CA mov [ebp+var_195], 0CAh
#########################################################################################################.text:00401C74 8D 85 6C FE FF FF lea eax, [ebp+var_194] ; Load Effective Address
.text:00401C7A 50 push eax
.text:00401C7B 8D 8D 6C FD FF FF lea ecx, [ebp+var_294] ; Load Effective Address
.text:00401C81 51 push ecx
.text:00401C82 8D 8D 7C FC FF FF lea ecx, [ebp+var_384] ; Load Effective Address
.text:00401C88 E8 D3 07 00 00 call unknown_libname_3 ; Microsoft VisualC 14/net runtime
.text:00401C8D 8B 50 04 mov edx, [eax+4]
.text:00401C90 52 push edx
.text:00401C91 8B 00 mov eax, [eax]
.text:00401C93 50 push eax
.text:00401C94 8D 8D E8 FC FF FF lea ecx, [ebp+var_318] ; Load Effective Address
.text:00401C9A E8 41 08 00 00 call sub_4024E0 ; Call Procedure
#########################################################################################################上面这段代码，应该是执行了一个内部的机制。list<uint8_t> list_table = {}
程序现将所有的数据赋值给了一堆局部变量，然后将 [ebp+var_294] 作为 list<uint8_t> list_table 的地址，调用了 unknown_libname_3 方法
接下来：call sub_4024E0 没看明白。。。。（2022-06-03 2120）
######【ebp+var_194】：长度 0x100 = 256 字节#########################################################################################################.text:00401C9F C7 45 FC 00 00 00 00 mov [ebp+var_4], 0 【try】【0】
.text:00401CA6 68 00 01 00 00 push 100h ;
.text:00401CAB 6A 00 push 0 ;
.text:00401CAD 8D 8D 70 FE FF FF lea ecx, [ebp+var_190] ;
.text:00401CB3 51 push ecx ; void *
.text:00401CB4 E8 17 71 00 00 call _memset ; Call Procedure【内存拷贝，其实是初始化了局部变量 】【[ebp+var_190]】
.text:00401CB9 83 C4 0C add esp, 0Ch ;
.text:00401CBC C6 45 FC 01 mov byte ptr [ebp+var_4], 1 【try】【1】
.text:00401CC0 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401CC4 7D 1E jge short loc_401CE4 ; Jump if Greater or Equal (SF=OF)【大于等于100，则退出】
######【ebp+var_190】：长度 0x100 = 256 字节//对应于C# uint8_t table[256] = { };
.text:00401CC6 8D 8D B4 FC FF FF lea ecx, [ebp+pExceptionObject] ; Load Effective Address
.text:00401CCC E8 FF F3 FF FF call sub_4010D0 ; Call Procedure
.text:00401CD1 68 90 79 42 00 push offset __TI1?AVexception@std@@ ; pThrowInfo
.text:00401CD6 8D 95 B4 FC FF FF lea edx, [ebp+pExceptionObject] ; Load Effective Address
.text:00401CDC 52 push edx ; pExceptionObject
.text:00401CDD E8 0C 70 00 00 call __CxxThrowException@8 ; attributes:
.rdata:00427140 stru_427140 TryBlockMapEntry <1, 1, 2, 2, offset stru_427230> __msRttiDscr <9, 00892A20, 0, 401D04h>
【401D04】
.text:00401D04 C7 85 D8 FC FF FF D9 34 89 00 mov [ebp+var_328], offset unk_8934D9
.text:00401D0E C7 85 44 FD FF FF 00 00 00 00 mov [ebp+var_2BC], 0 【循环索引：0】
.text:00401D18 8D 8D E8 FC FF FF lea ecx, [ebp+var_318] ; Load Effective Address 【循环长度】
.text:00401D1E 89 8D 34 FD FF FF mov [ebp+var_2CC], ecx
.text:00401D24 8D 95 48 FD FF FF lea edx, [ebp+var_2B8] ; Load Effective Address
.text:00401D2A 52 push edx
.text:00401D2B 8B 8D 34 FD FF FF mov ecx, [ebp+var_2CC]
.text:00401D31 E8 5A 07 00 00 call sub_402490 ; Call Procedure 【找this指针？】
.text:00401D36 8D 85 DC FC FF FF lea eax, [ebp+var_324] ; Load Effective Address
.text:00401D3C 50 push eax
.text:00401D3D 8B 8D 34 FD FF FF mov ecx, [ebp+var_2CC]
.text:00401D43 E8 38 07 00 00 call ?_Unwrapped@?$_Tree_iterator@V?$_Tree_val@U?$_Tree_simple_types@U?$pair@QAXU_Mutex_count_pair@?A0x04e813ea@@@std@@@std@@@std@@@std@@QBE?AV?$_Tree_unchecked_iterator@V?$_Tree_val@U?$_Tree_simple_types@U?$pair@QAXU_Mutex_count_pair@?A0x04e813ea@@@std@@@std@@@std@@@2@XZ ; std::_Tree_iterator<std::_Tree_val<std::_Tree_simple_types<std::pair<void * const,`anonymous namespace'::_Mutex_count_pair>>>>::_Unwrapped(void)
.text:00401D48 EB 0B jmp short loc_401D55 ; Jump
.text:00401D55
.text:00401D55 loc_401D55:
.text:00401D55 8D 8D DC FC FF FF lea ecx, [ebp+var_324] ; Load Effective Address
.text:00401D5B 51 push ecx
.text:00401D5C 8D 8D 48 FD FF FF lea ecx, [ebp+var_2B8] ; Load Effective Address
.text:00401D62 E8 D9 06 00 00 call unknown_libname_2 ; Microsoft VisualC 14/net runtime
.text:00401D67 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401D6A 85 D2 test edx, edx ; Logical Compare
.text:00401D6C 74 38 jz short loc_401DA6 ; catch执行之后，下一个地址存入eax里面
.text:00401DA6 loc_401DA6: ; catch执行之后，下一个地址存入eax里面
.text:00401DA6 B8 EC 1D 40 00 mov eax, offset loc_401DEC
.text:00401DAB C3 retn ; Return Near from Procedure
.text:00401DEC loc_401DEC:
.text:00401DEC C7 45 FC 00 00 00 00 mov [ebp+var_4], 0【try】【0】
.text:00401DF3
.text:00401DF3 loc_401DF3:
.text:00401DF3 C7 85 64 FD FF FF FC 30 0D 00 mov [ebp+dwSize], 0D30FCh 【size_t decompress_size = 0x000d30f2 + 10;】
.text:00401DFD C7 85 D4 FC FF FF 00 00 00 00 mov [ebp+var_32C], 0 【LPBYTE lpbuff1 = NULL;】
.text:00401E07 C7 85 5C FD FF FF 00 00 00 00 mov [ebp+var_2A4], 0 【uLong shellcode_size = 0;】
.text:00401E11 C7 85 58 FD FF FF 00 00 00 00 mov [ebp+var_2A8], 0 【uLongf ulongfsize = 0;】
.text:00401E1B C6 45 FC 03 mov byte ptr [ebp+var_4], 3 【try】【3】
.text:00401E1F 6A 40 push 40h ; '@' ; flProtect
.text:00401E21 68 00 10 00 00 push 1000h ; flAllocationType
.text:00401E26 8B 95 64 FD FF FF mov edx, [ebp+dwSize]
.text:00401E2C 52 push edx ; dwSize
.text:00401E2D 6A 00 push 0 ; lpAddress
.text:00401E2F FF 15 00 D0 41 00 call ds:VirtualAlloc ; Indirect Call Near Procedure
【VirtualAlloc(NULL, decompress_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);】.text:00401E35 89 85 28 FD FF FF mov [ebp+var_2D8], eax 【LPBYTE lpbuff = 】
.text:00401E3B 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401E3F 7D 1D jge short loc_401E5E ; Jump if Greater or Equal (SF=OF)【<100】
【LPBYTE lpbuff】【局部变量】=即将存放的第一阶段代码
.text:00401E41 8B 85 28 FD FF FF mov eax, [ebp+var_2D8]
.text:00401E47 89 85 24 FD FF FF mov [ebp+var_2DC], eax
.text:00401E4D 68 4C 7A 42 00 push offset __TI2PAE ; pThrowInfo
.text:00401E52 8D 8D 24 FD FF FF lea ecx, [ebp+var_2DC] ; Load Effective Address
.text:00401E58 51 push ecx ; pExceptionObject
.text:00401E59 E8 90 6E 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <3, 3, 18h, 1, offset stru_427230.nFlag+0D0h> __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h>
【401E63】
.text:00401E63 89 65 F0 mov [ebp+var_10], esp
.text:00401E66 8B 95 64 FD FF FF mov edx, [ebp+dwSize] ; 解密长度 【ulongfsize = (size_t)decompress_size;】
.text:00401E6C 89 95 58 FD FF FF mov [ebp+var_2A8], edx
.text:00401E72 C7 85 5C FD FF FF 21 E9 0C 00 mov [ebp+var_2A4], 0CE921h ; 原始长度 【shellcode_size = sizeof(g_shellcode_compress_64_1);】
.text:00401E7C 8B 85 5C FD FF FF mov eax, [ebp+var_2A4]
.text:00401E82 50 push eax
.text:00401E83 68 90 D2 5C 00 push offset unk_5CD290 ; 原始数据密文 【g_shellcode_compress_64_1】
.text:00401E88 8D 95 58 FD FF FF lea edx, [ebp+var_2A8] ; 解密长度
.text:00401E8E 8B 8D 20 FD FF FF mov ecx, [ebp+var_2E0] ; 解密地址 【LPBYTE lpbuff】
.text:00401E94 E8 67 F1 FF FF call sub_401000 ; 【第一阶段解码】
.text:00401E99 83 C4 08 add esp, 8 ; Add
.text:00401E9C C7 85 40 FD FF FF 00 00 00 00 mov [ebp+var_2C0], 0 【PFNDEC pfnDec1 = NULL;】
.text:00401EA6 C6 45 FC 05 mov byte ptr [ebp+var_4], 5 【try】【5】
.text:00401EAA 8B 8D 20 FD FF FF mov ecx, [ebp+var_2E0]
.text:00401EB0 89 8D 40 FD FF FF mov [ebp+var_2C0], ecx 【pfnDec1 = (PFNDEC)lpbuff;】【存放64位代码】
.text:00401EB6 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401EBA 7D 1D jge short loc_401ED9 ; Jump if Greater or Equal (SF=OF)
.text:00401EBC 8B 95 40 FD FF FF mov edx, [ebp+var_2C0] 【catch 拷贝 对象】
.text:00401EC2 89 95 1C FD FF FF mov [ebp+var_2E4], edx
.text:00401EC8 68 80 79 42 00 push offset __TI1P6AXPAE@Z ; pThrowInfo
.text:00401ECD 8D 85 1C FD FF FF lea eax, [ebp+var_2E4] ; Load Effective Address
.text:00401ED3 50 push eax ; pExceptionObject
.text:00401ED4 E8 15 6E 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <5, 5, 18h, 1, offset stru_427230.nFlag+0C0h> __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh>
【401EDE】【接下来就是一个32转64，执行完了之后，再转32】
.text:00401EDE 89 65 F0 mov [ebp+var_10], esp
.text:00401EE1 6A FF push 0FFFFFFFFh
.text:00401EE3 83 04 24 01 add [esp+var_s0], 1 ; Add
.text:00401EE7 68 FB 1E 40 00 push offset loc_401EFB
.text:00401EEC 8D 0D A0 34 89 00 lea ecx, unk_8934A0 ; Load Effective Address
.text:00401EF2 6A 33 push 33h ; '3'
.text:00401EF4 FF B5 CC FC FF FF push [ebp+var_334]
.text:00401EFA CB retf ; Return Far from Procedure
.text:00401EFB
.text:00401EFB loc_401EFB:
.text:00401EFB E8 00 00 00 00 call $+5 ; Call Procedure
.text:00401F00 C7 44 24 04 23 00 00 00 mov [esp+394h+var_390], 23h ; '#'
.text:00401F08 83 04 24 0D add [esp+394h+var_394], 0Dh ; Add
.text:00401F0C CB retf ; Return Far from Procedure
///////////////////////////////////////////////////////
///////////////////////////////////////////////////////
【第二阶段开始】.text:00401F0D BA 00 03 00 00 mov edx, 300h
.text:00401F12 8B 8D 40 FD FF FF mov ecx, [ebp+var_2C0]
.text:00401F18 E8 03 F1 FF FF call sub_401020 ; Call Procedure 【change_mem_rand(pfnDec1, 0x300)】
.text:00401F1D C7 85 3C FD FF FF 00 00 00 00 mov [ebp+var_2C4], 0
.text:00401F27 C6 45 FC 07 mov byte ptr [ebp+var_4], 7 【try】【7】
.text:00401F2B C7 85 64 FD FF FF 0B E5 2F 00 mov [ebp+dwSize], 2FE50Bh 【decompress_size = 0x002fe501 + 10;】
.text:00401F35 6A 40 push 40h ; '@' ; flProtect
.text:00401F37 68 00 10 00 00 push 1000h ; flAllocationType
.text:00401F3C 8B 8D 64 FD FF FF mov ecx, [ebp+dwSize]
.text:00401F42 51 push ecx ; dwSize
.text:00401F43 6A 00 push 0 ; lpAddress
.text:00401F45 FF 15 00 D0 41 00 call ds:VirtualAlloc ; Indirect Call Near Procedure
【VirtualAlloc(NULL, decompress_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);】.text:00401F4B 89 85 18 FD FF FF mov [ebp+var_2E8], eax 【LPBYTE lpbuff】
.text:00401F51 8B 95 18 FD FF FF mov edx, [ebp+var_2E8]
.text:00401F57 89 95 14 FD FF FF mov [ebp+var_2EC], edx
.text:00401F5D 68 4C 7A 42 00 push offset __TI2PAE ; pThrowInfo
.text:00401F62 8D 85 14 FD FF FF lea eax, [ebp+var_2EC] ; Load Effective Address
.text:00401F68 50 push eax ; pExceptionObject
.text:00401F69 E8 80 6D 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <7, 7, 8, 1, offset stru_427230.nFlag+20h> __msRttiDscr <0, 00892A10, 0FFFFFD10h, 401F6Eh>
【401F6E】
.text:00401F6E 8B 8D 64 FD FF FF mov ecx, [ebp+dwSize] 【ulongfsize = (size_t)decompress_size;】
.text:00401F74 89 8D 58 FD FF FF mov [ebp+var_2A8], ecx
.text:00401F7A C7 85 5C FD FF FF EC 6D 1F 00 mov [ebp+var_2A4], 1F6DECh 【shellcode_size = sizeof(g_shellcode_compress_32_2);】
.text:00401F84 8B 95 5C FD FF FF mov edx, [ebp+var_2A4]
.text:00401F8A 52 push edx
.text:00401F8B 68 B8 BB 69 00 push offset unk_69BBB8 【g_shellcode_compress_32_2】加密地址
.text:00401F90 8D 95 58 FD FF FF lea edx, [ebp+var_2A8] ; Load Effective Address
.text:00401F96 8B 8D 10 FD FF FF mov ecx, [ebp+var_2F0] 【lpbuff】【解密地址】
.text:00401F9C E8 5F F0 FF FF call sub_401000 ; 第二阶段解码
.text:00401FA1 83 C4 08 add esp, 8 ; Add
.text:00401FA4 8B 85 10 FD FF FF mov eax, [ebp+var_2F0]
.text:00401FAA 89 85 3C FD FF FF mov [ebp+var_2C4], eax 【 pfnDec2 = (PFNDEC)lpbuff;】
.text:00401FB0 B8 BF 1F 40 00 mov eax, offset loc_401FBF
.text:00401FB5 C3 retn ; Return Near from Procedure
.text:00401FBF loc_401FBF:
.text:00401FBF C7 45 FC 06 00 00 00 mov [ebp+var_4], 6 【try】【6】
.text:00401FC6
.text:00401FC6 loc_401FC6:
.text:00401FC6 C6 45 FC 09 mov byte ptr [ebp+var_4], 9 【try】【9】
.text:00401FCA 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401FCE 7D 1C jge short loc_401FEC ; Jump if Greater or Equal (SF=OF)
.text:00401FD0 8D 8D A8 FC FF FF lea ecx, [ebp+var_358] ; Load Effective Address
.text:00401FD6 E8 F5 F0 FF FF call sub_4010D0 ; Call Procedure
.text:00401FDB 68 90 79 42 00 push offset __TI1?AVexception@std@@ ; pThrowInfo
.text:00401FE0 8D 8D A8 FC FF FF lea ecx, [ebp+var_358] ; Load Effective Address
.text:00401FE6 51 push ecx ; pExceptionObject
.text:00401FE7 E8 02 6D 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <9, 9, 0Ah, 1, offset stru_427230.nFlag+30h> __msRttiDscr <9, 00892A20, 0, 401FEEh>
【401FEE】
.text:00401FEE 68 A0 34 89 00 push offset unk_8934A0 【g_sd】【重要】【全局变量】
.text:00401FF3 FF 95 3C FD FF FF call [ebp+var_2C4] ; Indirect Call Near Procedure 【pfnDec2(g_sd);】
.text:00401FF9 83 C4 04 add esp, 4 ; Add
.text:00401FFC B8 0B 20 40 00 mov eax, offset loc_40200B
.text:00402001 C3 retn ; Return Near from Procedure
///////////////////////////////////////////////////////
///////////////////////////////////////////////////////
【第三阶段处理】.text:0040200B loc_40200B:
.text:0040200B C7 45 FC 06 00 00 00 mov [ebp+var_4], 6 【try】【6】
.text:00402012
.text:00402012 loc_402012:
.text:00402012 C7 85 38 FD FF FF 00 00 00 00 mov [ebp+var_2C8], 0 【LPBYTE lpbuff3 = NULL;】
.text:0040201C C6 45 FC 0B mov byte ptr [ebp+var_4], 0Bh 【try】【B】
.text:00402020 C7 85 64 FD FF FF 09 D0 1A 00 mov [ebp+dwSize], 1AD009h ; 【decompress_size = 0x001acfff + 10;】
.text:0040202A 6A 40 push 40h ; '@' ; flProtect
.text:0040202C 68 00 10 00 00 push 1000h ; flAllocationType
.text:00402031 8B 95 64 FD FF FF mov edx, [ebp+dwSize]
.text:00402037 52 push edx ; dwSize
.text:00402038 6A 00 push 0 ; lpAddress
.text:0040203A FF 15 00 D0 41 00 call ds:VirtualAlloc ; lpbuff3 = (LPBYTE)VirtualAlloc(NULL, decompress_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
【VirtualAlloc(NULL, decompress_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);】.text:00402040 89 85 38 FD FF FF mov [ebp+var_2C8], eax
.text:00402046 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:0040204A 7E 1E jle short loc_40206A ; Jump if Less or Equal (ZF=1 | SF!=OF)【】
.text:0040206A
.text:0040206A loc_40206A:
.text:0040206A 8B 8D 3C FD FF FF mov ecx, [ebp+var_2C4] 【pfnDec2】【准备将其随机化】
.text:00402070 89 8D 0C FD FF FF mov [ebp+var_2F4], ecx
.text:00402076 68 80 79 42 00 push offset __TI1P6AXPAE@Z ; pThrowInfo
.text:0040207B 8D 95 0C FD FF FF lea edx, [ebp+var_2F4] ; Load Effective Address
.text:00402081 52 push edx ; pExceptionObject
.text:00402082 E8 67 6C 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <0Bh, 0Bh, 0Eh, 1, offset stru_427230.nFlag+50h> __msRttiDscr <0, 008929FC, 0FFFFFCC8h, 402089h>
【402089】
.text:00402089 89 65 F0 mov [ebp+var_10], esp
.text:0040208C BA 00 03 00 00 mov edx, 300h
.text:00402091 8B 8D C8 FC FF FF mov ecx, [ebp+var_338]
.text:00402097 E8 84 EF FF FF call sub_401020 ; 随机打乱解码 【change_mem_rand(pfnDec, 0x300);】
.text:0040209C C6 45 FC 0D mov byte ptr [ebp+var_4], 0Dh 【try】【D】
.text:004020A0 8B 85 64 FD FF FF mov eax, [ebp+dwSize] 【ulongfsize = (size_t)decompress_size;】【解密长度】
.text:004020A6 89 85 58 FD FF FF mov [ebp+var_2A8], eax
.text:004020AC C7 85 5C FD FF FF DD 39 1A 00 mov [ebp+var_2A4], 1A39DDh 【 shellcode_size = sizeof(g_shellcode_compress_64_3);】【加密长度】
.text:004020B6 8B 8D 5C FD FF FF mov ecx, [ebp+var_2A4]
.text:004020BC 51 push ecx
.text:004020BD 68 B0 98 42 00 push offset unk_4298B0 【g_shellcode_compress_64_3】【加密地址】
.text:004020C2 8D 95 58 FD FF FF lea edx, [ebp+var_2A8] ; Load Effective Address
.text:004020C8 8B 8D 38 FD FF FF mov ecx, [ebp+var_2C8] 【lpbuff3】【解密地址】
.text:004020CE E8 2D EF FF FF call sub_401000 ; 第三阶段解码
.text:004020D3 83 C4 08 add esp, 8 ; Add
.text:004020D6 EB 06 jmp short loc_4020DE ; Jump
.text:004020DE C7 45 FC 0C 00 00 00 mov [ebp+var_4], 0Ch
.text:004020E5 EB 07 jmp short loc_4020EE ; Jump
.text:004020EE loc_4020EE:
.text:004020EE B8 FD 20 40 00 mov eax, offset loc_4020FD
.text:004020F3 C3 retn ; Return Near from Procedure
.text:004020FD loc_4020FD:
.text:004020FD C7 45 FC 06 00 00 00 mov [ebp+var_4], 6
.text:00402104
.text:00402104 loc_402104:
.text:00402104 8B 95 38 FD FF FF mov edx, [ebp+var_2C8] 【lpbuff3】【解密地址】
.text:0040210A 89 95 08 FD FF FF mov [ebp+var_2F8], edx
.text:00402110 C6 45 FC 0F mov byte ptr [ebp+var_4], 0Fh 【try】【F】
.text:00402114 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00402118 7D 1D jge short loc_402137 ; Jump if Greater or Equal (SF=OF)
.text:0040211A 8B 85 08 FD FF FF mov eax, [ebp+var_2F8]
.text:00402120 89 85 04 FD FF FF mov [ebp+var_2FC], eax
.text:00402126 68 80 79 42 00 push offset __TI1P6AXPAE@Z ; pThrowInfo
.text:0040212B 8D 8D 04 FD FF FF lea ecx, [ebp+var_2FC] ; Load Effective Address
.text:00402131 51 push ecx ; pExceptionObject
.text:00402132 E8 B7 6B 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <0Fh, 0Fh, 18h, 1, offset stru_427230.nFlag+0B0h> __msRttiDscr <0, 008929FC, 0FFFFFCC4h, 40213Ch>
【40213C】32转64，执行之后，返回32
.text:0040213C 89 65 F0 mov [ebp+var_10], esp
.text:0040213F 6A FF push 0FFFFFFFFh
.text:00402141 83 04 24 01 add [esp+var_s0], 1 ; Add
.text:00402145 68 59 21 40 00 push offset loc_402159
.text:0040214A 8D 0D A0 34 89 00 lea ecx, unk_8934A0 ; Load Effective Address
.text:00402150 6A 33 push 33h ; '3'
.text:00402152 FF B5 C4 FC FF FF push [ebp+var_33C]
.text:00402158 CB retf ; Return Far from Procedure
.text:00402159 loc_402159:
.text:00402159 E8 00 00 00 00 call $+5 ; Call Procedure
.text:0040215E C7 44 24 04 23 00 00 00 mov [esp+394h+var_390], 23h ; '#'
.text:00402166 83 04 24 0D add [esp+394h+var_394], 0Dh ; Add
.text:0040216A CB retf ; Return Far from Procedure
【shellcode执行完成】.text:0040216B 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:0040216F 7E 1B jle short loc_40218C ; Jump if Less or Equal (ZF=1 | SF!=OF)
.text:0040218C loc_40218C:
.text:0040218C C6 45 FC 11 mov byte ptr [ebp+var_4], 11h 【try】【11】
.text:00402190 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00402194 7D 3A jge short loc_4021D0 ; Jump if Greater or Equal (SF=OF) 【大于等于100 ，不用考虑】
.text:00402196 A1 D9 35 89 00 mov eax, dword_8935D9 【g_sd_g_qwDecSuccess】
【#define g_sd_g_qwDecSuccess (*(uint64_t*)(g_sd+313))】【他是8个字节，也就是要求 2个DWORD为都为0】【实际上是8个字节为0】
.text:0040219B 0B 05 DD 35 89 00 or eax, dword_8935DD ; Logical Inclusive OR
.text:004021A1 74 09 jz short loc_4021AC ; Jump if Zero (ZF=1) 【此时不能被触发，否则会failed】
.text:004021AC loc_4021AC:
.text:004021AC C6 85 6B FD FF FF 00 mov [ebp+var_295], 0 【g_sd_g_qwDecSuccess = False】
.text:004021A3 C6 85 6B FD FF FF 01 mov [ebp+var_295], 1 【g_sd_g_qwDecSuccess = True】【失败】
.text:004021AA EB 07 jmp short loc_4021B3 ; Jump
.text:004021B3
.text:004021B3 loc_4021B3:
.text:004021B3 8A 8D 6B FD FF FF mov cl, [ebp+var_295]
.text:004021B9 88 8D 62 FD FF FF mov [ebp+var_29E], cl
.text:004021BF 68 E0 79 42 00 push offset __TI1_N ; pThrowInfo
.text:004021C4 8D 95 62 FD FF FF lea edx, [ebp+var_29E] ; Load Effective Address
.text:004021CA 52 push edx ; pExceptionObject
.text:004021CB E8 1E 6B 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <11h, 11h, 14h, 1, offset stru_427230.nFlag+70h> __msRttiDscr <0, 00892A3C, 0FFFFFD4Fh, 4021D2h>
【4021D2】
.text:004021D2 89 65 F0 mov [ebp+var_10], esp
.text:004021D5 C6 45 FC 13 mov byte ptr [ebp+var_4], 13h
.text:004021D9 0F B6 85 4F FD FF FF movzx eax, [ebp+var_2B1] ; Move with Zero-Extend
.text:004021E0 85 C0 test eax, eax ; Logical Compare 【g_sd_g_qwDecSuccess】
.text:004021E2 74 2B jz short loc_40220F ; Jump if Zero (ZF=1)
.text:004021E4 BA 00 01 00 00 mov edx, 100h 【g_sd_g_qwDecSuccess = True】【此时应该是弹出 failed】
.text:004021E9 B9 D9 34 89 00 mov ecx, offset unk_8934D9
.text:004021EE E8 2D EE FF FF call sub_401020 ; Call Procedure
.text:004021F3 8D 8D 84 FC FF FF lea ecx, [ebp+var_37C] ; Load Effective Address
.text:004021F9 E8 D2 EE FF FF call sub_4010D0 ; Call Procedure
.text:004021FE 68 90 79 42 00 push offset __TI1?AVexception@std@@ ; pThrowInfo
.text:00402203 8D 8D 84 FC FF FF lea ecx, [ebp+var_37C] ; Load Effective Address
.text:00402209 51 push ecx ; pExceptionObject
.text:0040220A E8 DF 6A 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <13h, 13h, 14h, 1, offset stru_427230.nFlag+60h> __msRttiDscr <9, 00892A20, 0, 402211h>
///【402211】
.text:00402216 E8 85 EE FF FF call sub_4010A0 ; Call Procedure
.text:0040221B 83 C4 04 add esp, 4 ; Add
.text:0040221E 68 A4 68 42 00 push offset aPause ; "pause"
.text:00402223 E8 3F 9C 00 00 call sub_40BE67 ; Call Procedure
.text:00402228 83 C4 04 add esp, 4 ; Add
.text:0040222B 6A 00 push 0 ; uExitCode
.text:0040222D FF 15 04 D0 41 00 call ds:ExitProcess ; Indirect Call Near Procedure
【此时是：】【g_sd_g_qwDecSuccess = False】
.text:0040220F loc_40220F: 【g_sd_g_qwDecSuccess = False】
.text:0040220F EB 28 jmp short loc_402239 ; Jump
.text:00402239 loc_402239:
.text:00402239 C7 45 FC 12 00 00 00 mov [ebp+var_4], 12h
.text:00402240 EB 07 jmp short loc_402249 ; Jump
.text:00402249 loc_402249:
.text:00402249 B8 58 22 40 00 mov eax, offset loc_402258
.text:0040224E C3 retn ; Return Near from Procedure
.text:00402258 loc_402258:
.text:00402258 C7 45 FC 10 00 00 00 mov [ebp+var_4], 10h
.text:0040225F loc_40225F:
.text:0040225F C6 45 FC 15 mov byte ptr [ebp+var_4], 15h 【try】【15】
.text:00402263 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands 【if (argc < 100)】
.text:00402267 7D 1B jge short loc_402284 ; Jump if Greater or Equal (SF=OF) 【跳出try，也就是出错了】
.text:00402269 C7 85 FC FC FF FF F1 95 89 00 mov [ebp+var_304], offset unk_8995F1 【(void*)g_sd_g_szDec】【全局变量】【关键，就是序列号】
.text:00402273 68 BC 79 42 00 push offset __TI1PAX ; pThrowInfo
.text:00402278 8D 95 FC FC FF FF lea edx, [ebp+var_304] ; Load Effective Address
.text:0040227E 52 push edx ; pExceptionObject
.text:0040227F E8 6A 6A 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <15h, 15h, 18h, 1, offset stru_427230.nFlag+0A0h> __msRttiDscr <0, 008929C4, 0FFFFFCD0h, 402289h>
【402289】
.text:00402289 89 65 F0 mov [ebp+var_10], esp
.text:0040228C C6 45 FC 17 mov byte ptr [ebp+var_4], 17h 【try】【17】
.text:00402290 6A 10 push 10h ; Size
.text:00402292 8B 85 D0 FC FF FF mov eax, [ebp+Buf2] 【buff】【g_sd_g_szDec】【注意 try 与 catch 的参数的传递】
.text:00402298 50 push eax ; Buf2
.text:00402299 8D 4D D8 lea ecx, [ebp+Buf1] ; Load Effective Address 【szInput】
.text:0040229C 51 push ecx ; Buf1
.text:0040229D E8 2A 8B 01 00 call _memcmp ; Call Procedure 【memcmp(szInput, buff, 16);】
.text:004022A2 83 C4 0C add esp, 0Ch ; Add
.text:004022A5 89 85 F8 FC FF FF mov [ebp+var_308], eax 【结果】
.text:004022AB 33 D2 xor edx, edx ; Logical Exclusive OR
.text:004022AD 83 BD F8 FC FF FF 00 cmp [ebp+var_308], 0 ; Compare Two Operands 【相等，则 eax=1】
.text:004022B4 0F 94 C2 setz dl ; Set Byte if Zero (ZF=1)
.text:004022B7 88 95 61 FD FF FF mov [ebp+var_29F], dl
.text:004022BD 0F B6 85 61 FD FF FF movzx eax, [ebp+var_29F] ; Move with Zero-Extend
.text:004022C4 85 C0 test eax, eax ; Logical Compare
.text:004022C6 74 2D jz short loc_4022F5 ; Jump if Zero (ZF=1)
.text:004022C8 BA 00 01 00 00 mov edx, 100h 【此时 ZF=0，也就是非零】
.text:004022CD B9 D9 34 89 00 mov ecx, offset unk_8934D9
.text:004022D2 E8 49 ED FF FF call sub_401020 ; Call Procedure【随机化】
.text:004022D7 8D 8D 90 FC FF FF lea ecx, [ebp+var_370] ; Load Effective Address
.text:004022DD E8 EE ED FF FF call sub_4010D0 ; Call Procedure
.text:004022E2 68 90 79 42 00 push offset __TI1?AVexception@std@@ ; pThrowInfo
.text:004022E7 8D 8D 90 FC FF FF lea ecx, [ebp+var_370] ; Load Effective Address 【throw std::exception{};】//class std::exception
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402321h>
.text:004022ED 51 push ecx ; pExceptionObject
.text:004022EE E8 FB 69 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.text:004022F5 loc_4022F5: 【失败】
.text:004022F5 BA 00 01 00 00 mov edx, 100h
.text:004022FA B9 D9 34 89 00 mov ecx, offset unk_8934D9
.text:004022FF E8 1C ED FF FF call sub_401020 ; Call Procedure【随机化】
.text:00402304 C7 85 F4 FC FF FF 01 00 00 00 mov [ebp+var_30C], 1 【 throw 1;】.rdata:00427230 __msRttiDscr <40h, 0, 0, 402349h>
.text:0040230E 68 28 79 42 00 push offset __TI1H ; pThrowInfo
.text:00402313 8D 95 F4 FC FF FF lea edx, [ebp+var_30C] ; Load Effective Address
.text:00402319 52 push edx ; pExceptionObject
.text:0040231A E8 CF 69 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
【try：17 有两个catch，此时会通过对象值来判断用哪一个catch】
.rdata:00427140 TryBlockMapEntry <17h, 17h, 18h, 2, offset stru_427230.nFlag+80h> __msRttiDscr <9, 00892A20, 0, 402321h>
.rdata:00427230 __msRttiDscr <9, 00892A20, 0, 402321h> //class std::exception
.rdata:00427230 __msRttiDscr <40h, 0, 0, 402349h>
【402321】
.text:00402326 E8 75 ED FF FF call sub_4010A0 ; Call Procedure
.text:0040232B 83 C4 04 add esp, 4 ; Add
.text:0040232E 68 A4 68 42 00 push offset aPause ; "pause"
.text:00402333 E8 2F 9B 00 00 call sub_40BE67 ; Call Procedure
.text:00402338 83 C4 04 add esp, 4 ; Add
.text:0040233B 6A 00 push 0 ; uExitCode
.text:0040233D FF 15 04 D0 41 00 call ds:ExitProcess ; Indirect Call Near Procedure
unk_8934A0：g_sdunk_8934B9：g_sd_g_szSerialunk_8935D9：8个字节为0
unk_8995F1：0x10个字节与 用户名相等
8935D9 - 8934A0 = 139
8995F1 - 8934A0 = 6151
8934B9 - 8934A0 = 19
g_sd_g_szSerial：用户输入的序列号，32字节
##############################################################.text:00401406 68 8C 68 42 00 push offset aInputName ; "Input name:"
.text:0040140B E8 90 FC FF FF call sub_4010A0 ; Call Procedure
.text:00401410 83 C4 04 add esp, 4 ; Add
.text:00401413 BA 10 00 00 00 mov edx, 10h
.text:00401418 8D 4D D8 lea ecx, [ebp+Buf1] ; Buffer
.text:0040141B E8 70 FE FF FF call sub_401290 ; Call Procedure
.text:00401420 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401423 85 D2 test edx, edx ; Logical Compare
.text:00401425 75 21 jnz short loc_401448 ; Jump if Not Zero (ZF=0)
【Buf1】【局部变量】：用户输入的用户名.text:004014D0
.text:004014D0 loc_4014D0:
.text:004014D0 68 AC 68 42 00 push offset aInputKey ; "Input key:"
.text:004014D5 E8 C6 FB FF FF call sub_4010A0 ; Call Procedure
.text:004014DA 83 C4 04 add esp, 4 ; Add
.text:004014DD BA 40 00 00 00 mov edx, 40h ; '@'
.text:004014E2 8D 8D 70 FF FF FF lea ecx, [ebp+Buffer] ; Buffer
.text:004014E8 E8 A3 FD FF FF call sub_401290 ; Call Procedure
.text:004014ED 0F B6 C0 movzx eax, al ; Move with Zero-Extend
.text:004014F0 85 C0 test eax, eax ; Logical Compare
.text:004014F2 75 21 jnz short loc_401515 ; Jump if Not Zero (ZF=0)
【Buffer】【局部变量】：用户输入的序列号
.text:00401515
.text:00401515 loc_401515:
.text:00401515 33 C9 xor ecx, ecx ; Logical Exclusive OR
.text:00401517 89 4D B8 mov [ebp+var_48], ecx
.text:0040151A 89 4D BC mov [ebp+var_44], ecx
.text:0040151D 89 4D C0 mov [ebp+var_40], ecx
.text:00401520 89 4D C4 mov [ebp+var_3C], ecx
.text:00401523 89 4D C8 mov [ebp+var_38], ecx
.text:00401526 89 4D CC mov [ebp+var_34], ecx
.text:00401529 89 4D D0 mov [ebp+var_30], ecx
.text:0040152C 89 4D D4 mov [ebp+var_2C], ecx
######【ebp+var_48】【局部变量】【 unsigned char byteEnc[32] = { 0 };】.text:0040152F 8D 55 B8 lea edx, [ebp+var_48] ; Load Effective Address
.text:00401532 8D 8D 70 FF FF FF lea ecx, [ebp+Buffer] ; Load Effective Address
.text:00401538 E8 A3 FD FF FF call sub_4012E0 ; Call Procedure
######【ebp+var_48 = string2hex(szEnc)】【局部变量】【 string2hex(szEnc, byteEnc);】【此处是 16进制字符串 转 16进制】.text:0040153D 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401540 85 D2 test edx, edx ; Logical Compare
.text:00401542 75 21 jnz short loc_401565 ; Jump if Not Zero (ZF=0)
【第一个是将用户输入的 序列号 拷贝到了 全局变量 unk_8934B9 长度是 32 字节（转换之后），之前是64个字符。】
######【unk_8934B9】【输入 序列号】【memcpy(g_sd_g_szSerial, byteEnc, 32);】.text:00401565 loc_401565:
.text:00401565 B9 08 00 00 00 mov ecx, 8
.text:0040156A 8D 75 B8 lea esi, [ebp+var_48] ; Load Effective Address
.text:0040156D BF B9 34 89 00 mov edi, offset unk_8934B9
.text:00401572 F3 A5 rep movsd ; Move Byte(s) from String to String
【第二个是将内置的数据拷贝到了 全局变量】.text:00401574 C6 85 6C FD FF FF 95 mov [ebp+var_294], 95h
.text:0040157B C6 85 6D FD FF FF E2 mov [ebp+var_293], 0E2h
.text:00401582 C6 85 6E FD FF FF 80 mov [ebp+var_292], 80h
.text:00401589 C6 85 6F FD FF FF C6 mov [ebp+var_291], 0C6h
.text:00401590 C6 85 70 FD FF FF EA mov [ebp+var_290], 0EAh
.text:00401597 C6 85 71 FD FF FF C3 mov [ebp+var_28F], 0C3h
………………………………………………………………………………………………………………………………………………………………………….text:00401C58 C6 85 68 FE FF FF CF mov [ebp+var_198], 0CFh
.text:00401C5F C6 85 69 FE FF FF AE mov [ebp+var_197], 0AEh
.text:00401C66 C6 85 6A FE FF FF 8B mov [ebp+var_196], 8Bh
.text:00401C6D C6 85 6B FE FF FF CA mov [ebp+var_195], 0CAh
#########################################################################################################.text:00401C74 8D 85 6C FE FF FF lea eax, [ebp+var_194] ; Load Effective Address
.text:00401C7A 50 push eax
.text:00401C7B 8D 8D 6C FD FF FF lea ecx, [ebp+var_294] ; Load Effective Address
.text:00401C81 51 push ecx
.text:00401C82 8D 8D 7C FC FF FF lea ecx, [ebp+var_384] ; Load Effective Address
.text:00401C88 E8 D3 07 00 00 call unknown_libname_3 ; Microsoft VisualC 14/net runtime
.text:00401C8D 8B 50 04 mov edx, [eax+4]
.text:00401C90 52 push edx
.text:00401C91 8B 00 mov eax, [eax]
.text:00401C93 50 push eax
.text:00401C94 8D 8D E8 FC FF FF lea ecx, [ebp+var_318] ; Load Effective Address
.text:00401C9A E8 41 08 00 00 call sub_4024E0 ; Call Procedure
#########################################################################################################上面这段代码，应该是执行了一个内部的机制。list<uint8_t> list_table = {}
程序现将所有的数据赋值给了一堆局部变量，然后将 [ebp+var_294] 作为 list<uint8_t> list_table 的地址，调用了 unknown_libname_3 方法
接下来：call sub_4024E0 没看明白。。。。（2022-06-03 2120）
######【ebp+var_194】：长度 0x100 = 256 字节#########################################################################################################.text:00401C9F C7 45 FC 00 00 00 00 mov [ebp+var_4], 0 【try】【0】
.text:00401CA6 68 00 01 00 00 push 100h ;
.text:00401CAB 6A 00 push 0 ;
.text:00401CAD 8D 8D 70 FE FF FF lea ecx, [ebp+var_190] ;
.text:00401CB3 51 push ecx ; void *
.text:00401CB4 E8 17 71 00 00 call _memset ; Call Procedure【内存拷贝，其实是初始化了局部变量 】【[ebp+var_190]】
.text:00401CB9 83 C4 0C add esp, 0Ch ;
.text:00401CBC C6 45 FC 01 mov byte ptr [ebp+var_4], 1 【try】【1】
.text:00401CC0 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401CC4 7D 1E jge short loc_401CE4 ; Jump if Greater or Equal (SF=OF)【大于等于100，则退出】
######【ebp+var_190】：长度 0x100 = 256 字节//对应于C# uint8_t table[256] = { };
.text:00401CC6 8D 8D B4 FC FF FF lea ecx, [ebp+pExceptionObject] ; Load Effective Address
.text:00401CCC E8 FF F3 FF FF call sub_4010D0 ; Call Procedure
.text:00401CD1 68 90 79 42 00 push offset __TI1?AVexception@std@@ ; pThrowInfo
.text:00401CD6 8D 95 B4 FC FF FF lea edx, [ebp+pExceptionObject] ; Load Effective Address
.text:00401CDC 52 push edx ; pExceptionObject
.text:00401CDD E8 0C 70 00 00 call __CxxThrowException@8 ; attributes:
.rdata:00427140 stru_427140 TryBlockMapEntry <1, 1, 2, 2, offset stru_427230> __msRttiDscr <9, 00892A20, 0, 401D04h>
【401D04】
.text:00401D04 C7 85 D8 FC FF FF D9 34 89 00 mov [ebp+var_328], offset unk_8934D9
.text:00401D0E C7 85 44 FD FF FF 00 00 00 00 mov [ebp+var_2BC], 0 【循环索引：0】
.text:00401D18 8D 8D E8 FC FF FF lea ecx, [ebp+var_318] ; Load Effective Address 【循环长度】
.text:00401D1E 89 8D 34 FD FF FF mov [ebp+var_2CC], ecx
.text:00401D24 8D 95 48 FD FF FF lea edx, [ebp+var_2B8] ; Load Effective Address
.text:00401D2A 52 push edx
.text:00401D2B 8B 8D 34 FD FF FF mov ecx, [ebp+var_2CC]
.text:00401D31 E8 5A 07 00 00 call sub_402490 ; Call Procedure 【找this指针？】
.text:00401D36 8D 85 DC FC FF FF lea eax, [ebp+var_324] ; Load Effective Address
.text:00401D3C 50 push eax
.text:00401D3D 8B 8D 34 FD FF FF mov ecx, [ebp+var_2CC]
.text:00401D43 E8 38 07 00 00 call ?_Unwrapped@?$_Tree_iterator@V?$_Tree_val@U?$_Tree_simple_types@U?$pair@QAXU_Mutex_count_pair@?A0x04e813ea@@@std@@@std@@@std@@@std@@QBE?AV?$_Tree_unchecked_iterator@V?$_Tree_val@U?$_Tree_simple_types@U?$pair@QAXU_Mutex_count_pair@?A0x04e813ea@@@std@@@std@@@std@@@2@XZ ; std::_Tree_iterator<std::_Tree_val<std::_Tree_simple_types<std::pair<void * const,`anonymous namespace'::_Mutex_count_pair>>>>::_Unwrapped(void)
.text:00401D48 EB 0B jmp short loc_401D55 ; Jump
.text:00401D55
.text:00401D55 loc_401D55:
.text:00401D55 8D 8D DC FC FF FF lea ecx, [ebp+var_324] ; Load Effective Address
.text:00401D5B 51 push ecx
.text:00401D5C 8D 8D 48 FD FF FF lea ecx, [ebp+var_2B8] ; Load Effective Address
.text:00401D62 E8 D9 06 00 00 call unknown_libname_2 ; Microsoft VisualC 14/net runtime
.text:00401D67 0F B6 D0 movzx edx, al ; Move with Zero-Extend
.text:00401D6A 85 D2 test edx, edx ; Logical Compare
.text:00401D6C 74 38 jz short loc_401DA6 ; catch执行之后，下一个地址存入eax里面
.text:00401DA6 loc_401DA6: ; catch执行之后，下一个地址存入eax里面
.text:00401DA6 B8 EC 1D 40 00 mov eax, offset loc_401DEC
.text:00401DAB C3 retn ; Return Near from Procedure
.text:00401DEC loc_401DEC:
.text:00401DEC C7 45 FC 00 00 00 00 mov [ebp+var_4], 0【try】【0】
.text:00401DF3
.text:00401DF3 loc_401DF3:
.text:00401DF3 C7 85 64 FD FF FF FC 30 0D 00 mov [ebp+dwSize], 0D30FCh 【size_t decompress_size = 0x000d30f2 + 10;】
.text:00401DFD C7 85 D4 FC FF FF 00 00 00 00 mov [ebp+var_32C], 0 【LPBYTE lpbuff1 = NULL;】
.text:00401E07 C7 85 5C FD FF FF 00 00 00 00 mov [ebp+var_2A4], 0 【uLong shellcode_size = 0;】
.text:00401E11 C7 85 58 FD FF FF 00 00 00 00 mov [ebp+var_2A8], 0 【uLongf ulongfsize = 0;】
.text:00401E1B C6 45 FC 03 mov byte ptr [ebp+var_4], 3 【try】【3】
.text:00401E1F 6A 40 push 40h ; '@' ; flProtect
.text:00401E21 68 00 10 00 00 push 1000h ; flAllocationType
.text:00401E26 8B 95 64 FD FF FF mov edx, [ebp+dwSize]
.text:00401E2C 52 push edx ; dwSize
.text:00401E2D 6A 00 push 0 ; lpAddress
.text:00401E2F FF 15 00 D0 41 00 call ds:VirtualAlloc ; Indirect Call Near Procedure
【VirtualAlloc(NULL, decompress_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);】.text:00401E35 89 85 28 FD FF FF mov [ebp+var_2D8], eax 【LPBYTE lpbuff = 】
.text:00401E3B 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401E3F 7D 1D jge short loc_401E5E ; Jump if Greater or Equal (SF=OF)【<100】
【LPBYTE lpbuff】【局部变量】=即将存放的第一阶段代码
.text:00401E41 8B 85 28 FD FF FF mov eax, [ebp+var_2D8]
.text:00401E47 89 85 24 FD FF FF mov [ebp+var_2DC], eax
.text:00401E4D 68 4C 7A 42 00 push offset __TI2PAE ; pThrowInfo
.text:00401E52 8D 8D 24 FD FF FF lea ecx, [ebp+var_2DC] ; Load Effective Address
.text:00401E58 51 push ecx ; pExceptionObject
.text:00401E59 E8 90 6E 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <3, 3, 18h, 1, offset stru_427230.nFlag+0D0h> __msRttiDscr <0, 00892A10, 0FFFFFD20h, 401E63h>
【401E63】
.text:00401E63 89 65 F0 mov [ebp+var_10], esp
.text:00401E66 8B 95 64 FD FF FF mov edx, [ebp+dwSize] ; 解密长度 【ulongfsize = (size_t)decompress_size;】
.text:00401E6C 89 95 58 FD FF FF mov [ebp+var_2A8], edx
.text:00401E72 C7 85 5C FD FF FF 21 E9 0C 00 mov [ebp+var_2A4], 0CE921h ; 原始长度 【shellcode_size = sizeof(g_shellcode_compress_64_1);】
.text:00401E7C 8B 85 5C FD FF FF mov eax, [ebp+var_2A4]
.text:00401E82 50 push eax
.text:00401E83 68 90 D2 5C 00 push offset unk_5CD290 ; 原始数据密文 【g_shellcode_compress_64_1】
.text:00401E88 8D 95 58 FD FF FF lea edx, [ebp+var_2A8] ; 解密长度
.text:00401E8E 8B 8D 20 FD FF FF mov ecx, [ebp+var_2E0] ; 解密地址 【LPBYTE lpbuff】
.text:00401E94 E8 67 F1 FF FF call sub_401000 ; 【第一阶段解码】
.text:00401E99 83 C4 08 add esp, 8 ; Add
.text:00401E9C C7 85 40 FD FF FF 00 00 00 00 mov [ebp+var_2C0], 0 【PFNDEC pfnDec1 = NULL;】
.text:00401EA6 C6 45 FC 05 mov byte ptr [ebp+var_4], 5 【try】【5】
.text:00401EAA 8B 8D 20 FD FF FF mov ecx, [ebp+var_2E0]
.text:00401EB0 89 8D 40 FD FF FF mov [ebp+var_2C0], ecx 【pfnDec1 = (PFNDEC)lpbuff;】【存放64位代码】
.text:00401EB6 83 7D 08 64 cmp [ebp+argc], 64h ; 'd' ; Compare Two Operands
.text:00401EBA 7D 1D jge short loc_401ED9 ; Jump if Greater or Equal (SF=OF)
.text:00401EBC 8B 95 40 FD FF FF mov edx, [ebp+var_2C0] 【catch 拷贝 对象】
.text:00401EC2 89 95 1C FD FF FF mov [ebp+var_2E4], edx
.text:00401EC8 68 80 79 42 00 push offset __TI1P6AXPAE@Z ; pThrowInfo
.text:00401ECD 8D 85 1C FD FF FF lea eax, [ebp+var_2E4] ; Load Effective Address
.text:00401ED3 50 push eax ; pExceptionObject
.text:00401ED4 E8 15 6E 00 00 call __CxxThrowException@8 ; _CxxThrowException(x,x)
.rdata:00427140 TryBlockMapEntry <5, 5, 18h, 1, offset stru_427230.nFlag+0C0h> __msRttiDscr <0, 008929FC, 0FFFFFCCCh, 401EDEh>
【401EDE】【接下来就是一个32转64，执行完了之后，再转32】
.text:00401EDE 89 65 F0 mov [ebp+var_10], esp
.text:00401EE1 6A FF push 0FFFFFFFFh
.text:00401EE3 83 04 24 01 add [esp+var_s0], 1 ; Add
.text:00401EE7 68 FB 1E 40 00 push offset loc_401EFB
.text:00401EEC 8D 0D A0 34 89 00 lea ecx, unk_8934A0 ; Load Effective Address
.text:00401EF2 6A 33 push 33h ; '3'
.text:00401EF4 FF B5 CC FC FF FF push [ebp+var_334]
.text:00401EFA CB retf ; Return Far from Procedure
.text:00401EFB
.text:00401EFB loc_401EFB:
.text:00401EFB E8 00 00 00 00 call $+5 ; Call Procedure
.text:00401F00 C7 44 24 04 23 00 00 00 mov [esp+394h+var_390], 23h ; '#'
.text:00401F08 83 04 24 0D add [esp+394h+var_394], 0Dh ; Add
.text:00401F0C CB retf ; Return Far from Procedure
///////////////////////////////////////////////////////
///////////////////////////////////////////////////////
【第二阶段开始】.text:00401F0D BA 00 03 00 00 mov edx, 300h
.text:00401F12 8B 8D 40 FD FF FF mov ecx, [ebp+var_2C0]
.text:00401F18 E8 03 F1 FF FF call sub_401020 ; Call Procedure 【change_mem_rand(pfnDec1, 0x300)】
.text:00401F1D C7 85 3C FD FF FF 00 00 00 00 mov [ebp+var_2C4], 0
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期待完成
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混淆代码种类太多了，这是个体力活。 混淆循坏里嵌套混淆混淆、混淆循环里嵌入堆栈平衡无效代码，多种情况夹杂在一起，没有现成的脚本来实现去除。 目前还没写好的适配的脚本处理方法：科锐团队厉害  ，此题的WP都略过了去除混淆的方法，搞清楚此题，对能力提升非常有帮助。
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目前对三段代码进行分析的时候，里面有大量的花指令，还有固定格式的，还有嵌套的，原理摸得差不多，但是用代码消除有点费劲，有没有对花指令研究透的大脑，特别是 科锐团队，可以一起交流交流下。
一直想录制一段视频，发现整理框架代码可以讲清楚，但是三段代码如何去除花指令，最后得出加密的逻辑代码，卡壳了 |
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接主题帖： 首先贴出三段dump出来的代码。 |
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dump1.exe：第一段代码是64bit，里面有大量花指令，需要进行清除之后，才方便进行程序逻辑分析。（待续） |
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dump2.exe：第二段代码是32bit，里面有大量花指令，需要进行清除之后，才方便进行程序逻辑分析。 花指令的特征主要有如下几处： 一、连续的指令 1、ebp、esp还原【是后面的特例】 seg000:000CC824 014 55 push ebp seg000:000CC825 018 89 E5 mov ebp, esp seg000:000CC827 018 8D 64 24 FC lea esp, [esp-4] seg000:000CC82B 01C 89 EC mov esp, ebp seg000:000CC82D 01C 5D pop ebp 2、esp还原【是后面的特例】 seg000:000C5FBA 01C 52 push edx seg000:000C5FBB 020 8D 64 24 04 lea esp, [esp+4] 3、无用指令【待核实，只有一处】 seg000:0021C40D 84 56 C7 test [esi-39h], dl seg000:0021C410 08 00 or [eax], al
1、ebp、esp还原【中间嵌入长跳转】 seg000:000CC824 014 55 push ebp seg000:000CC825 018 89 E5 mov ebp, esp seg000:000CC827 018 8D 64 24 FC lea esp, [esp-4] seg000:000CC82B 01C 89 EC mov esp, ebp seg000:000CC82D 01C 5D pop ebp 2、esp还原【中间嵌入长跳转】 seg000:000C5FBA 01C 52 push edx seg000:000C5FBB 020 8D 64 24 04 lea esp, [esp+4] 3、pushf、popf还原【中间嵌入长跳转】 seg000:002A0496 loc_2A0496: ; CODE XREF: seg000:00000001↑j seg000:002A0496 9C pushf seg000:002A0497 51 push ecx seg000:002A0498 50 push eax seg000:002A0499 31 C0 xor eax, eax seg000:002A049B seg000:002A049B loc_2A049B: ; CODE XREF: seg000:002A04B3↓j seg000:002A049B 83 F8 03 cmp eax, 3 seg000:002A049E 74 15 jz short loc_2A04B5 seg000:002A04A0 40 inc eax seg000:002A04A1 81 E9 2E CD 9B A2 sub ecx, 0A29BCD2Eh seg000:002A04A7 81 C9 07 48 0C 20 or ecx, 200C4807h seg000:002A04AD 81 D9 2B 22 BB B1 sbb ecx, 0B1BB222Bh seg000:002A04B3 72 E6 jb short loc_2A049B seg000:002A04B5 seg000:002A04B5 loc_2A04B5: ; CODE XREF: seg000:002A049E↑j seg000:002A04B5 58 pop eax seg000:002A04B6 59 pop ecx seg000:002A04B7 9D popf 4、pushf、popf还原【中间嵌入长跳转、还嵌套自身】 seg000:002AE278 9C pushf seg000:002AE279 E9 5E 37 FB FF jmp loc_2619DC seg000:002619DC loc_2619DC: ; CODE XREF: seg000:002AE279↓j seg000:002619DC 52 push edx seg000:002619DD 51 push ecx seg000:002619DE 9C pushf 【此处 嵌套了自身】 seg000:002619DF 50 push eax seg000:002619E0 52 push edx seg000:002619E1 31 D2 xor edx, edx seg000:002619E3 seg000:002619E3 loc_2619E3: ; CODE XREF: seg000:002619F8↓j seg000:002619E3 83 FA 0A cmp edx, 0Ah seg000:002619E6 74 12 jz short loc_2619FA seg000:002619E8 42 inc edx seg000:002619E9 05 3F 86 3A 6F add eax, 6F3A863Fh seg000:002619EE 0D 99 24 DF 25 or eax, 25DF2499h seg000:002619F3 05 D0 BA 30 4B add eax, 4B30BAD0h seg000:002619F8 7E E9 jle short loc_2619E3 seg000:002619FA seg000:002619FA loc_2619FA: ; CODE XREF: seg000:002619E6↑j seg000:002619FA 5A pop edx seg000:002619FB 58 pop eax seg000:002619FC 9D popf seg000:002619FD E9 B6 62 EC FF jmp loc_127CB8 seg000:00127CB8 loc_127CB8: ; CODE XREF: seg000:002619FD↓j seg000:00127CB8 31 C9 xor ecx, ecx seg000:00127CBA seg000:00127CBA loc_127CBA: ; CODE XREF: seg000:000FAD33↑j seg000:00127CBA 83 F9 06 cmp ecx, 6 seg000:00127CBD 55 push ebp seg000:00127CBE 89 E5 mov ebp, esp seg000:00127CC0 8D 64 24 FC lea esp, [esp-4] seg000:00127CC4 89 EC mov esp, ebp seg000:00127CC6 5D pop ebp seg000:00127CC7 E9 E0 48 F4 FF jmp loc_6C5AC seg000:0006C5AC loc_6C5AC: ; CODE XREF: seg000:00127CC7↓j seg000:0006C5AC 0F 84 15 0A FF FF jz loc_5CFC7 seg000:0006C5B2 41 inc ecx seg000:0006C5B3 E9 78 7B 1B 00 jmp loc_224130 seg000:00224130 loc_224130: ; CODE XREF: seg000:0006C5B3↑j seg000:00224130 81 FA 6B 15 C8 6D cmp edx, 6DC8156Bh seg000:00224136 81 E2 38 42 C7 AF and edx, 0AFC74238h seg000:0022413C E9 EC 6B ED FF jmp loc_FAD2D seg000:000FAD2D loc_FAD2D: ; CODE XREF: seg000:0022413C↓j seg000:000FAD2D 81 DA FA A1 7F 86 sbb edx, 867FA1FAh seg000:000FAD33 0F 80 81 CF 02 00 jo loc_127CBA seg000:000FAD39 E9 89 22 F6 FF jmp loc_5CFC7 seg000:0005CFC7 loc_5CFC7: ; CODE XREF: seg000:loc_6C5AC↓j seg000:0005CFC7 ; seg000:000FAD39↓j seg000:0005CFC7 59 pop ecx seg000:0005CFC8 5A pop edx seg000:0005CFC9 E9 54 CF 1E 00 jmp loc_249F22 seg000:00249F22 loc_249F22: ; CODE XREF: seg000:0005CFC9↑j seg000:00249F22 9D popf seg000:00249F23 8D 64 24 04 lea esp, [esp+4] seg000:00249F27 E9 4B AA E9 FF jmp loc_E4977 seg000:000E4977 loc_E4977: ; CODE XREF: seg000:00249F27↓j seg000:000E4977 E9 C5 2E 1A 00 jmp loc_287841 seg000:00287841 loc_287841: ; CODE XREF: seg000:loc_E4977↑j seg000:00287841 9D popf 这两个花指令的简略特征是： 9C pushf 52 push edx 51 push ecx 31 C9 xor ecx, ecx 83 F9 08 cmp ecx, 8 【JZ 后续代码 的最后一个有条件跳转会 跳转到此处】 0F 84 A2 17 E4 FF jz loc_E9020 59 pop ecx 5A pop edx 9D popf 【JZ】后续代码 特征1： 47 inc edi 81 EA 4A 0A 6A C8 sub edx, 0C86A0A4Ah 81 F2 F7 12 2D EE xor edx, 0EE2D12F7h 81 EA C6 07 02 1C sub edx, 1C0207C6h 0F 89 FB E3 13 00 jns loc_1D2296 特征2: 43 inc ebx 1D F3 63 58 CC sbb eax, 0CC5863F3h 25 DC C9 C5 7F and eax, 7FC5C9DCh 05 C8 9D D9 2E add eax, 2ED99DC8h 0F 8D FB 01 FA FF jge loc_1A7C7E 特征3： 41 inc ecx 3D 7C AA 0E E6 cmp eax, 0E60EAA7Ch 35 93 5A FA 84 xor eax, 84FA5A93h 1D 64 15 D9 23 sbb eax, 23D91564h 0F 88 B0 7F EA FF js loc_158A72 特征4： 41 inc ecx 81 D2 B7 D6 07 45 adc edx, 4507D6B7h 81 CA 5A 03 73 78 or edx, 7873035Ah 81 C2 10 EA 7D 71 add edx, 717DEA10h 0F 88 E1 61 03 00 js loc_1CC00A 特征5： 41 inc ecx 15 CB 30 92 03 adc eax, 39230CBh 25 86 2C C9 70 and eax, 70C92C86h 15 17 1C 96 C5 adc eax, 0C5961C17h 0F 86 FE 34 11 00 jbe loc_2077A4 现在需要对其进行批量消除 1、首先去除固定的连续指令序列，这个较为简单，也能很快去除。 2、其次去除带有跳转的不连续指令序列，这个较为麻烦，需要分析指令。 3、检查，是否有遗漏，或是错误删除。 在消除过程中：注意需要将JZ处指令，改成JMP，强制跳转过去【可有效避免F5时垃圾代码生成】；将pushf处指令改为jmp，直接跳转到popf之后的指令【跳出花指令干扰】。 留出疑问： 1、尝试，不对垃圾指令进行nop，是否能够避免错误？ 2、代码里面存在 自加密解密，那采用nop会存在错误。。。 附python代码：仅供参考，去除完成之后，发现代码存在问题，一是没有全部清除干净，二是存在错误指令，疑似删错。 ##############################################################################
#清除单个：注意主线的JMP保留【0-8】、支线的JMP消除【9-13】。
def clearSingle(patternList):
#考虑清除
# 全部清0，将 jz 设置为 jmp
if len(patternList)<=0:
return
for p in patternList:
#实际上是第5条指令，如果有重复的JZ，那就需要只处理第5条指令。
if p[1].upper() == "JZ":
#修改机器码 JMP
if idc.get_wide_byte(p[0]) == 0x74:
ida_bytes.patch_byte(p[0],0xEB)
elif idc.get_wide_word(p[0])==0x840F:
ida_bytes.patch_word(p[0],0xE990)
continue
else:
#nop
#my_nop(p[0],NextHead(p[0]))#有可能误删
nextAddr = idaapi.decode_insn(idaapi.insn_t(),p[0]) + p[0]
my_nop(p[0],nextAddr)
###或者再进一步搜索一下，直接将分支都nop，但是如何才能得知回到循环了？
####修改首地址，跳转到末尾
def ModifySingle(patternList,endAddrIndex):
if len(patternList)<=0:
return
startAddr = patternList[0][0]
endAddr = patternList[endAddrIndex][0]
insn = idaapi.insn_t()
endAddr = idaapi.decode_insn(insn,endAddr) + endAddr
PrintInfo2("#"*10+"修改首位地址，使其跳转到尾部。")
PrintInfo2("startAddr=0x{:X},endAddr=0x{:X}".format(startAddr,endAddr))
patch_byte(startAddr,0xE9)
#########################
## startAddr = 0x2A0496
## endAddr = 0x2A04B8
##
## endAddr = 0x2A048D
#########################
####
diffValue = endAddr - startAddr - 5
####支持负数处理
value = struct.unpack('>L', struct.pack('l', diffValue))[0] & 0xFFFFFFFF
#value = 0x1d000000
bytesValue = struct.pack('>L',value)
#bytesValue = b'\x1d\x00\x00\x00'
#strValue = bytesValue.hex()
#strValue = '1d000000'
#value = hex(value)[2:]
idaapi.patch_bytes(startAddr+1,bytesValue)
最后于 2022-8-31 13:13
被htg编辑
，原因：
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2022-10-14 2325 发现新的匹配方式： 看来需要现对等效代码做一个替换，然后再用通用的方式来处理，这里还是涉及到长跳转的处理。 lea esp, [esp-4] jmp ...... mov [esp+8+var_8], edi ///等效为 【push edi】 等效为 【push edi】 ---------------------------------- mov eax, [esp+0Ch+var_C] ///等效为 【pop eax】 jmp loc_12F11B lea esp, [esp+4] 等效为 【pop eax】 seg000:000089C8 loc_89C8: ; CODE XREF: sub_1DC2DF:loc_58E65↓j seg000:000089C8 pushf seg000:000089C9 jmp loc_1EBF44 seg000:001EBF44 loc_1EBF44: ; CODE XREF: sub_1DC2DF-1D3916↑j seg000:001EBF44 pushf seg000:001EBF45 jmp loc_7961A seg000:0007961A loc_7961A: ; CODE XREF: seg000:001BE3E8↓j seg000:0007961A ; sub_1DC2DF+FC66↓j seg000:0007961A lea esp, [esp-4] seg000:0007961E mov [esp+8+var_8], edi ///等效为 【push edi】 seg000:00079621 jmp loc_1F1B2E seg000:001F1B2E loc_1F1B2E: ; CODE XREF: sub_1DC2DF-162CBE↑j seg000:001F1B2E lea esp, [esp-4] seg000:001F1B32 mov [esp+0Ch+var_C], eax ///等效为 【push eax】 seg000:001F1B35 jmp loc_85EEC seg000:00085EEC loc_85EEC: ; CODE XREF: sub_1DC2DF+15856↓j seg000:00085EEC jmp loc_20B1E8 seg000:0020B1E8 loc_20B1E8: ; CODE XREF: sub_1DC2DF:loc_85EEC↑j seg000:0020B1E8 xor eax, eax seg000:0020B1EA jmp loc_1A1C4 seg000:0001A1C4 loc_1A1C4: ; CODE XREF: sub_1DC2DF+2EF0B↓j seg000:0001A1C4 jmp loc_E2395 seg000:000E2395 loc_E2395: ; CODE XREF: sub_1DC2DF:loc_1A1C4↑j seg000:000E2395 ; seg000:loc_7AB77↑j seg000:000E2395 cmp eax, 6 seg000:000E2398 jmp loc_86E48 seg000:00086E48 loc_86E48: ; CODE XREF: sub_1DC2DF-F9F47↓j seg000:00086E48 jz loc_82FF5 seg000:00086E4E jmp loc_6F4B4 seg000:0006F4B4 loc_6F4B4: ; CODE XREF: sub_1DC2DF-155491↓j seg000:0006F4B4 inc eax seg000:0006F4B5 jmp loc_21BB65 seg000:0021BB65 loc_21BB65: ; CODE XREF: sub_1DC2DF-16CE2A↑j seg000:0021BB65 adc edi, 17EF568Dh seg000:0021BB6B pushf 【新的嵌套循环】 seg000:0021BB6C jmp loc_1440CF seg000:001440CF loc_1440CF: ; CODE XREF: sub_1DC2DF+3F88D↓j seg000:001440CF jmp loc_15C847 seg000:0015C847 loc_15C847: ; CODE XREF: sub_1DC2DF:loc_1440CF↑j seg000:0015C847 push ebx seg000:0015C848 push eax seg000:0015C849 jmp loc_273C72 ------ seg000:00082FF5 loc_82FF5: ; CODE XREF: seg000:0007AB7D↑j seg000:00082FF5 ; sub_1DC2DF:loc_86E48↓j seg000:00082FF5 mov eax, [esp+0Ch+var_C] ///等效为 【pop eax】 seg000:00082FF8 jmp loc_12F11B seg000:0012F11B loc_12F11B: ; CODE XREF: sub_1DC2DF-1592E7↑j seg000:0012F11B lea esp, [esp+4] seg000:0012F11F pushf 【新的嵌套循环】 seg000:0002042D loc_2042D: ; CODE XREF: sub_1DC2DF-AD1BF↓j seg000:0002042D push edx seg000:0002042E push ecx seg000:0002042F jmp loc_2606FB |
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