[原创]VMProtect分析（三）-加壳脱壳-看雪-安全社区|安全招聘|kanxue.com

[原创]VMProtect分析（三）

发表于: 2021-7-16 18:26 24887

[原创]VMProtect分析（三）

Anakin Stone 活跃值

2021-7-16 18:26

24887

参考上节的跟踪记录vm_tls.txt，可以看到第117行和第290行的VmCALL将代码分成3块，标记为Chunk1 - Chunk3，我们先看下VmCALL的实现，再分别分析这3块代码。

shrd rsi,rbx,cl

mov esi,dword ptr ss:[rbp]

Esi = 栈顶DWORD

clc

stc

add rbp,8

jmp vmp_userdebugger.7FF69E7403F7

bsf ax,di

sar r12d,cl

inc r12d

shl ch,5

lea r12,qword ptr ds:[7FF69E74065C]

R12 固定取7FF69E74065C

rcl al,7

not bh

mov rax,100000000

rcr rbx,10

add rsi,rax

Rsi += 100000000

xchg al,bh

bsr bx,dx

shld bx,sp,cl

rcr ebx,cl

mov rbx,rsi

Rbx = Rsi

movsx cx,cl

add rsi,qword ptr ss:[rbp]

Rsi += 栈顶QWORD, 注意此处未调整RBP栈指针

可以看到，VmCALL取栈中DWORD作为基数计算RBX和RSI，我们第一篇分析过，RSI指向字节码缓冲区，RBX为解密Seed，也就是说每个Chunk都有自己的RSI和RBX。

在继续分析Chunk之前，可先参考下节Nor Gate说明，其对用到的运算的Nor变换做了详细说明，下面的分析不在赘述。

[Anakin] VmPOP V_98 ;V_98 = $HandlerBase

[Anakin] VmPUSH FFFFFFFF9F5A5C32

[Anakin] VmADD

[Anakin] VmPOP V_40

[Anakin] VmPOP V_B8

[Anakin] VmPOP V_28

[Anakin] VmPOP V_18

[Anakin] VmPOP V_00

[Anakin] VmPOP V_78

[Anakin] VmPOP V_A0

[Anakin] VmPOP V_90

[Anakin] VmPOP V_40

[Anakin] VmPOP V_20

[Anakin] VmPOP V_68

[Anakin] VmPOP V_50

[Anakin] VmPOP V_58

[Anakin] VmPOP V_30

[Anakin] VmPOP V_B0

[Anakin] VmPOP V_38

[Anakin] VmPOP V_48

[Anakin] VmPOP V_70

[Anakin] VmPOP V_88

[Anakin] VmPOP V_10

[Anakin] VmPOP V_A8

[Anakin] VmPUSH 0000000064765E24 ;压栈分支1标识

[Anakin] VmPUSHB8 00

[Anakin] VmPUSH 000000014018B3E7

[Anakin] VmPUSH V_98

[Anakin] VmADD

[Anakin] VmPOP V_08

[Anakin] VmREADB ;b = BYTE:[000000014018B3E7 + $HandlerBase]

[Anakin] VmSBP

[Anakin] VmREADB

[Anakin] VmNOTANDB ;b = ~b

[Anakin] VmPOP V_60

[Anakin] VmADDB ;b = 00 + b

[Anakin] VmPOP V_10 ;V_10 = eflags

[Anakin] VmSBP

[Anakin] VmREADB

[Anakin] VmNOTANDB ;b = ~b

[Anakin] VmPOP V_80 ;V_80 = eflags

[Anakin] VmPOPW8 V_60 ;V_60 = b

[Anakin] VmPUSH V_10

[Anakin] VmNOTAND ;d1 = NOTAND(V_10, V_10) => d1 = ~V_10

[Anakin] VmPOP V_60

[Anakin] VmPUSH FFFFFFFFFFFFF7EA

[Anakin] VmNOTAND ;d1 = NOTAND(d1, FFFFF7EA) => d1 = Nor(~V_10, ~00000815) = V_10 & 00000815

[Anakin] VmPOP V_08

[Anakin] VmPUSH V_80

[Anakin] VmNOTAND ;d2 = NOTAND(V_80, V_80) => d2 = ~V_80

[Anakin] VmPOP V_60

[Anakin] VmPUSH 0000000000000815

[Anakin] VmNOTAND ;d2 = NOTAND(d2, 00000815) => d2 = Nor(~V_80, ~FFFFF7EA) = V_80 & FFFFF7EA

[Anakin] VmPOP V_08

[Anakin] VmADD

[Anakin] VmPOP V_08

[Anakin] VmPOP V_70 ;V_70 = d1 + d2 => V_70 = EFLAGS(BYTE:[000000014018B3E7 + $HandlerBase] - 0)

[Anakin] VmPUSH 0000000064766651 ;压栈分支2标识

[Anakin] VmSBP ;压栈栈顶指针，用于后文选择分支

[Anakin] VmPUSHB8 03

[Anakin] VmPUSHD 000000BF

[Anakin] VmPUSH V_70

[Anakin] VmNOTAND ;q = CDQ(NOTAND(V_70, 000000BF)) => ZF == 0 ? 0b1000000 : 0

[Anakin] VmPOP V_68

[Anakin] VmSHR ;q = SHR(q, 3) => ZF == 0 ? 8 : 0

[Anakin] VmPOP V_08

[Anakin] VmADD ;q += SavedRBP (上文压栈的栈顶指针，选择分支)

[Anakin] VmPOP V_08

[Anakin] VmREADQ

[Anakin] VmPOP V_A8 ;V_A8 = QWORD:[q]（取分支标识）

[Anakin] VmPOP V_68

[Anakin] VmPOP V_08

[Anakin] VmPUSH V_A8

[Anakin] VmPOPD V_A8 ;V_A8 = CQD(V_A8)

[Anakin] VmPUSHD V_A8

[Anakin] VmSBP

[Anakin] VmREADD

[Anakin] VmNOTANDD ;d1 = NOTAND(V_A8, V_A8)

[Anakin] VmPOP V_08

[Anakin] VmPUSHD DB91AA8C

[Anakin] VmNOTANDD ;d1 = NOTAND(d1, DB91AA8C) => d1 = Nor(~V_A8, ~246E5573)

[Anakin] VmPOP V_68

[Anakin] VmPUSHD 246E5573

[Anakin] VmPUSHD V_A8

[Anakin] VmNOTANDD ;d2 = NOTAND(V_A8, 246E5573) => d2 = Nor(V_A8, 246E5573)

[Anakin] VmPOP V_60

[Anakin] VmNOTANDD

[Anakin] VmPOP V_60

[Anakin] VmPOP V_08 ;V_08 = NOTAND(d2, d1) => V_08 = Nor(d1, d2) = V_A8 ^ 246E5573 （分支标识解密）

[Anakin] VmPUSH V_18

[Anakin] VmPUSH V_98

[Anakin] VmPUSH V_60

[Anakin] VmPUSH V_00

[Anakin] VmPUSH V_88

[Anakin] VmPUSH V_50

[Anakin] VmPUSH V_30

[Anakin] VmPUSH V_B0

[Anakin] VmPUSH V_20

[Anakin] VmPUSH V_28

[Anakin] VmPUSH V_38

[Anakin] VmPUSH V_78

[Anakin] VmPUSH V_A0

[Anakin] VmPUSH V_90

[Anakin] VmPUSH V_58

[Anakin] VmPUSH V_48

[Anakin] VmPUSH V_40

[Anakin] VmPUSH V_18

[Anakin] VmPUSH V_70

[Anakin] VmPUSH V_B8

[Anakin] VmPUSH 0000000060A5A3CE

[Anakin] VmADD

[Anakin] VmPOP V_60

[Anakin] VmPUSH V_98

[Anakin] VmPUSH V_08 ;压栈解码后的分支标识

[Anakin] VmCALL ;调用选择分支

等价逻辑：

If (*(BYTE*)(000000014018B3E7 + $HandlerBase) != 0)

{

//未执行

VmCALL 40180B57

}

Else

{

//即Chunk2

VmCALL 40183322

}

[Anakin] VmPOP V_90 ;V_90 = $HandlerBase

[Anakin] VmPUSH FFFFFFFF9F5A5C32

[Anakin] VmADD

[Anakin] VmPOP V_20

[Anakin] VmPOP V_00

[Anakin] VmPOP V_70

[Anakin] VmPOP V_80

[Anakin] VmPOP V_60

[Anakin] VmPOP V_98

[Anakin] VmPOP V_38

[Anakin] VmPOP V_48

[Anakin] VmPOP V_28

[Anakin] VmPOP V_18

[Anakin] VmPOP V_30

[Anakin] VmPOP V_10

[Anakin] VmPOP V_88

[Anakin] VmPOP V_08

[Anakin] VmPOP V_A8

[Anakin] VmPOP V_40

[Anakin] VmPOP V_20

[Anakin] VmPOP V_68

[Anakin] VmPOPD V_78 ;V_78 = eflags

[Anakin] VmPUSHD V_78

[Anakin] VmNOTANDD

[Anakin] VmPOP V_B0

[Anakin] VmPUSHD DB91AA8C

[Anakin] VmNOTANDD

[Anakin] VmPOP V_B8

[Anakin] VmPUSHD 246E5573

[Anakin] VmPUSHD V_78

[Anakin] VmNOTANDD

[Anakin] VmPOP V_50

[Anakin] VmNOTANDD

[Anakin] VmPOP V_B0

[Anakin] VmPOP V_A0 ;V_A0 = V_78 ^ 246E5573

[Anakin] VmPOP V_58

[Anakin] VmPOP V_B8

[Anakin] VmPUSH V_70

[Anakin] VmPUSH V_88

[Anakin] VmPUSH V_08

[Anakin] VmPUSH V_48

[Anakin] VmPUSH V_98

[Anakin] VmPUSH V_80

[Anakin] VmPUSH V_A8

[Anakin] VmPUSH 000000000CABFA9E ;PUSH Branch1

[Anakin] VmPUSH 000000014018B3E7

[Anakin] VmPUSH V_90

[Anakin] VmADD

[Anakin] VmPOP V_50 ;PUSH (V_90 + 000000014018B3E7)

[Anakin] VmPUSH 0000000140000000

[Anakin] VmPUSH V_90

[Anakin] VmADD

[Anakin] VmPOP V_58

[Anakin] VmPOP V_50 ;V_50 = V_90 + 0000000140000000 => V_50 = PIMAGE_DOS_HEADER

[Anakin] VmPUSH V_50

[Anakin] VmPUSHD 0000003C

[Anakin] VmADD

[Anakin] VmPOP V_58 ;PUSH (V_50 + 0000003C)

[Anakin] VmREADD

[Anakin] VmPOPD V_88 ;V_88 = DWORD:[BP] => V_88 = PIMAGE_DOS_HEADER->e_lfanew

[Anakin] VmPUSH 0000000000000000

[Anakin] VmPOPD V_8C

[Anakin] VmPUSH V_88

[Anakin] VmPUSH V_50

[Anakin] VmADD

[Anakin] VmPOP V_A8 ;PUSH (V_50 + V_88) => PUSH PIMAGE_NT_HEADERS64

[Anakin] VmSBP

[Anakin] VmREADQ

[Anakin] VmPOP V_B0

[Anakin] VmPUSHD 00000028

[Anakin] VmADD

[Anakin] VmPOP V_A8 ;PUSH (PIMAGE_NT_HEADERS64 + 00000028) => PUSH PIMAGE_NT_HEADERS64->AddressOfEntryPoint

[Anakin] VmREADD

[Anakin] VmPOPD V_B0 ;V_B0 = AddressOfEntryPoint

[Anakin] VmPUSH 0000000000000000

[Anakin] VmPOPD V_B4 ;V_B4 = 0

[Anakin] VmPUSH V_50

[Anakin] VmPUSH V_B0

[Anakin] VmADD

[Anakin] VmPOP V_A8

[Anakin] VmPOP V_A8 ;V_A8 = V_B0 + V_50

[Anakin] VmPUSHB8 cc

[Anakin] VmPUSH V_A8

[Anakin] VmREADB ;b = BYTE:[V_A8], 判断程序入口点地址第一个字节是不是‘0xCC’

[Anakin] VmSBP ;判断逻辑参考Chunk1及Nor Gate

[Anakin] VmREADB

[Anakin] VmNOTANDB

[Anakin] VmPOP V_58

[Anakin] VmADDB

[Anakin] VmPOP V_58

[Anakin] VmSBP

[Anakin] VmREADB

[Anakin] VmNOTANDB

[Anakin] VmPOP V_B8

[Anakin] VmPOPW8 V_70

[Anakin] VmPUSH V_58

[Anakin] VmSBP

[Anakin] VmREADQ

[Anakin] VmNOTAND

[Anakin] VmPOP V_88

[Anakin] VmPUSH FFFFFFFFFFFFF7EA

[Anakin] VmNOTAND

[Anakin] VmPOP V_B0

[Anakin] VmPUSH V_B8

[Anakin] VmNOTAND

[Anakin] VmPOP V_70

[Anakin] VmPUSH 0000000000000815

[Anakin] VmNOTAND

[Anakin] VmPOP V_88

[Anakin] VmADD

[Anakin] VmPOP V_88

[Anakin] VmPOP V_70

[Anakin] VmPOP V_88

[Anakin] VmPUSH 000000000CABFDC1 ;PUSH Branch2

[Anakin] VmSBP

[Anakin] VmPUSHB8 03

[Anakin] VmPUSHD 000000BF

[Anakin] VmPUSH V_70

[Anakin] VmNOTAND

[Anakin] VmPOP V_A0

[Anakin] VmSHR

[Anakin] VmPOP V_B0

[Anakin] VmADD

[Anakin] VmPOP V_B0

[Anakin] VmREADQ

[Anakin] VmPOP V_58

[Anakin] VmPOP V_B0

[Anakin] VmPOP V_08

[Anakin] VmPUSH V_58

[Anakin] VmPOPD V_58

[Anakin] VmPUSHD V_58

[Anakin] VmSBP

[Anakin] VmREADD

[Anakin] VmNOTANDD

[Anakin] VmPOP V_A0

[Anakin] VmPUSHD B34CBE36

[Anakin] VmNOTANDD

[Anakin] VmPOP V_78

[Anakin] VmPUSHD 4CB341C9

[Anakin] VmPUSHD V_58

[Anakin] VmNOTANDD

[Anakin] VmPOP V_B0

[Anakin] VmNOTANDD

[Anakin] VmPOP V_B0

[Anakin] VmPOP V_08 ;V_08 = $Branch ^ 4CB341C9

[Anakin] VmPUSH V_50

[Anakin] VmPUSH V_08

[Anakin] VmPUSH V_80

[Anakin] VmPUSH V_B0

[Anakin] VmPUSH V_40

[Anakin] VmPUSH V_88

[Anakin] VmPUSH V_38

[Anakin] VmPUSH V_98

[Anakin] VmPUSH V_18

[Anakin] VmPUSH V_68

[Anakin] VmPUSH V_28

[Anakin] VmPUSH V_30

[Anakin] VmPUSH V_48

[Anakin] VmPUSH V_60

[Anakin] VmPUSH V_10

[Anakin] VmPUSH V_A8

[Anakin] VmPUSH V_20

[Anakin] VmPUSH V_50

[Anakin] VmPUSH V_70

[Anakin] VmPUSH V_00

[Anakin] VmPUSH 0000000060A5A3CE

[Anakin] VmADD

[Anakin] VmPOP V_B0

[Anakin] VmPUSH V_90

[Anakin] VmPUSH V_08 ;压栈选择的分支

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wx_随风_744 雪币：能力值： ( LV1，RANK：0 ) 在线值：发帖 1 回帖 3 粉丝 0 关注私信	wx_随风_744 2 楼厉害啊 2021-7-20 08:40 0
xiaohang 雪币： 2149 活跃值： (3211) 能力值： (RANK：260 ) 在线值：发帖 20 回帖 212 粉丝 83 关注私信	xiaohang 3 3 楼怎么都没人回复了，是看懵圈了吗？ 2021-7-21 10:41 1
wx_变。雪币： 553 活跃值： (241) 能力值： ( LV2，RANK：10 ) 在线值：发帖 1 回帖 3 粉丝 0 关注私信	wx_变。 4 楼看懵圈了 2021-7-21 19:19 0
朽_木雪币： 316 活跃值： (67) 能力值： ( LV2，RANK：10 ) 在线值：发帖 0 回帖 2 粉丝 1 关注私信	朽_木 5 楼厉害 2021-7-23 11:57 0
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