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[原创]北斗变形程序补充说明
发表于: 2011-12-12 10:06 8699

[原创]北斗变形程序补充说明

jgaoabc 活跃值
1
2011-12-12 10:06
8699

外面跑了一个星期，回来看到我的北斗变形程序好多疑问，我想补充说明一下：

一、程序肯定有不完善的地方，需要改进，因此公布出来征求意见，大家可以把变形后不能运行的原程序传给我，方便我改进。我只是业余研究，没有任何商业目的。我的QQ：85495610。

二、如果变形的时候提示“选项错误或者文件格式不对”，那是压缩选项选择不对，程序的压缩选项如下图，一定要按照这些设置，因为我的程序有针对性的。最好把需要变形的程序和bx02.exe放在同一目录下。运行变形后的程序时最好把360之类的软件关闭掉。
 

三、如果昨天能运行，今天不能运行，最大的可能是你今天运行的时候同时打开了OD，因为我的程序是可以检测OD的，在OD里是更不能运行变形后的程序的。详见我的文章《反StrongOD的原理和实例》http://bbs.pediy.com/showthread.php?t=139657。

四、我提供的变形后的calc.exe和notepad.exe是XP的SP2系统里的，如果用在64位或者linux系统，我想肯定会出错。我系统里装有XP的SP2和SP3、WINDOWS 7.0和WINDOWS 2003，在这些系统里我测试过这二个变形后的程序，可以正常运行。

五、变形程序里的DEL和REN是DOS命令，如果你的系统连这二条命令都不能执行的话，就不要考虑用这个变形程序了。

六、附件中的calc_yuanxing.exe是程序的原形。就是还没有变形过的shellcode脱壳代码，运用VMP变形的一个好处就是每变形一次，就会产生一个不同的变形代码。这段shellcode脱壳代码非常简单，总共只有约300 byte，经过VMP变形可以达到5000 byte。代码中我就用了二个反调试。一个就是NtQueryObject反调试，另外一个是ZwClose反调试。附件中的calc_ya.exe和notepad_ya.exe是经过北斗压缩过还没有变形的程序，方便大家测试。

calc_yuanxing.exe程序代码说明：

01020000 calc_yua.<ModuleE>  8BFF                      mov edi,edi                                           ; ntdll.7C930228
01020002                     55                        push ebp
01020003                     8BEC                      mov ebp,esp
01020005                     81EC 00010000             sub esp,100
0102000B                     51                        push ecx
0102000C                     52                        push edx
0102000D                     53                        push ebx
0102000E                     56                        push esi
0102000F                     57                        push edi
01020010                     E8 00000000               call calc_yua.01020015
01020015                     5B                        pop ebx
01020016                     81C3 EB0C0000             add ebx,0CEB                                          ; ebx为数据区内存地址
0102001C                     8BCB                      mov ecx,ebx
0102001E                     83C1 10                   add ecx,10
01020021                     33D2                      xor edx,edx
01020023                     8331 56                   xor dword ptr ds:[ecx],56                             ; 解密数据区的字符
01020026                     41                        inc ecx
01020027                     42                        inc edx
01020028                     83FA 15                   cmp edx,15
0102002B                   ^ 75 F6                     jnz short calc_yua.01020023
0102002D                     33C9                      xor ecx,ecx
0102002F                     64:8B71 30                mov esi,dword ptr fs:[ecx+30]
01020033                     8B76 0C                   mov esi,dword ptr ds:[esi+C]
01020036                     8B76 1C                   mov esi,dword ptr ds:[esi+1C]
01020039                     8B46 08                   mov eax,dword ptr ds:[esi+8]
0102003C                     8B7E 20                   mov edi,dword ptr ds:[esi+20]
0102003F                     8B36                      mov esi,dword ptr ds:[esi]
01020041                     66:394F 18                cmp word ptr ds:[edi+18],cx
01020045                   ^ 75 F2                     jnz short calc_yua.01020039
01020047                     50                        push eax
01020048                     8F45 FC                   pop dword ptr ss:[ebp-4]                              ; [ebp-4]为kernel32.dll的基址
0102004B                     68 0EB45C23               push 235CB40E
01020050                     810424 9F1DD81D           add dword ptr ss:[esp],1DD81D9F
01020057                     FF75 FC                   push dword ptr ss:[ebp-4]
0102005A                     6A 00                     push 0
0102005C                     E8 9F0B0000               call calc_yua.01020C00
01020061                     8945 F8                   mov dword ptr ss:[ebp-8],eax                          ; [ebp-8]为LoadLibraryA内存地址
01020064                     833B 00                   cmp dword ptr ds:[ebx],0
01020067                     74 2C                     je short calc_yua.01020095
01020069                     0FB70B                    movzx ecx,word ptr ds:[ebx]
0102006C                     03CB                      add ecx,ebx
0102006E                     51                        push ecx
0102006F                     FF55 F8                   call dword ptr ss:[ebp-8]
01020072                     8BF8                      mov edi,eax
01020074                     0FB74B 02                 movzx ecx,word ptr ds:[ebx+2]
01020078                     03CB                      add ecx,ebx
0102007A                     8339 00                   cmp dword ptr ds:[ecx],0
0102007D                     74 11                     je short calc_yua.01020090
0102007F                     FF31                      push dword ptr ds:[ecx]
01020081                     57                        push edi
01020082                     6A 00                     push 0
01020084                     E8 770B0000               call calc_yua.01020C00
01020089                     8901                      mov dword ptr ds:[ecx],eax                            ; 取得各API函数的内存值，用于反调试
0102008B                     83C1 04                   add ecx,4
0102008E                   ^ EB EA                     jmp short calc_yua.0102007A
01020090                     83C3 04                   add ebx,4
01020093                   ^ EB CF                     jmp short calc_yua.01020064
01020095                     83EB 0C                   sub ebx,0C
01020098                     FF75 F8                   push dword ptr ss:[ebp-8]
0102009B                     8F83 5C010000             pop dword ptr ds:[ebx+15C]                            ; 脱壳用的LoadLibraryA
010200A1                     FF73 50                   push dword ptr ds:[ebx+50]
010200A4                     8F83 60010000             pop dword ptr ds:[ebx+160]                            ; 脱壳用的GetProcAddress
010200AA                     FF73 34                   push dword ptr ds:[ebx+34]
010200AD                     8F83 64010000             pop dword ptr ds:[ebx+164]                            ; 脱壳用的VirtualProtect
010200B3                     FF73 30                   push dword ptr ds:[ebx+30]
010200B6                     8F83 68010000             pop dword ptr ds:[ebx+168]                            ; 脱壳用的VirtualAlloc
010200BC                     FF73 38                   push dword ptr ds:[ebx+38]
010200BF                     8F83 6C010000             pop dword ptr ds:[ebx+16C]                            ; 脱壳用的VirtualFree
010200C5                     FF73 40                   push dword ptr ds:[ebx+40]
010200C8                     8F83 70010000             pop dword ptr ds:[ebx+170]                            ; 脱壳用的ExitProcess
010200CE                     6A 40                     push 40                                               ; 申请内存，用于NtQueryObject反调试和解压代码
010200D0                     68 00100000               push 1000
010200D5                     68 00200000               push 2000
010200DA                     6A 00                     push 0
010200DC                     FF53 30                   call dword ptr ds:[ebx+30]                            ; kernel32.VirtualAlloc
010200DF                     8983 9C000000             mov dword ptr ds:[ebx+9C],eax
010200E5                     6A 40                     push 40                                               ; 申请内存，用于放置压缩体代码
010200E7                     68 00100000               push 1000
010200EC                     FFB3 A8000000             push dword ptr ds:[ebx+A8]
010200F2                     6A 00                     push 0
010200F4                     FF53 30                   call dword ptr ds:[ebx+30]                            ; kernel32.VirtualAlloc
010200F7                     8983 A8000000             mov dword ptr ds:[ebx+A8],eax
010200FD                     6A 00                     push 0                                                ; NtQueryObject反调试开始
010200FF                     68 00200000               push 2000
01020104                     FFB3 9C000000             push dword ptr ds:[ebx+9C]
0102010A                     6A 03                     push 3
0102010C                     6A 00                     push 0
0102010E                     FF93 88000000             call dword ptr ds:[ebx+88]                            ; ntdll.ZwQueryObject
01020114                     36:8B8B 9C000000          mov ecx,dword ptr ss:[ebx+9C]
0102011B                     33D2                      xor edx,edx
0102011D                     81FA E01F0000             cmp edx,1FE0
01020123                     74 51                     je short calc_yua.01020176
01020125                     8039 44                   cmp byte ptr ds:[ecx],44
01020128                     75 3E                     jnz short calc_yua.01020168
0102012A                     8079 02 65                cmp byte ptr ds:[ecx+2],65
0102012E                     75 38                     jnz short calc_yua.01020168
01020130                     8079 04 62                cmp byte ptr ds:[ecx+4],62
01020134                     75 32                     jnz short calc_yua.01020168
01020136                     8079 06 75                cmp byte ptr ds:[ecx+6],75
0102013A                     75 2C                     jnz short calc_yua.01020168
0102013C                     8079 08 67                cmp byte ptr ds:[ecx+8],67
01020140                     75 26                     jnz short calc_yua.01020168
01020142                     8079 0A 4F                cmp byte ptr ds:[ecx+A],4F
01020146                     75 20                     jnz short calc_yua.01020168
01020148                     8079 0C 62                cmp byte ptr ds:[ecx+C],62
0102014C                     75 1A                     jnz short calc_yua.01020168
0102014E                     8079 0E 6A                cmp byte ptr ds:[ecx+E],6A
01020152                     75 14                     jnz short calc_yua.01020168
01020154                     8079 10 65                cmp byte ptr ds:[ecx+10],65
01020158                     75 0E                     jnz short calc_yua.01020168
0102015A                     8079 12 63                cmp byte ptr ds:[ecx+12],63
0102015E                     75 08                     jnz short calc_yua.01020168
01020160                     8079 14 74                cmp byte ptr ds:[ecx+14],74
01020164                     75 02                     jnz short calc_yua.01020168
01020166                     EB 04                     jmp short calc_yua.0102016C
01020168                     41                        inc ecx
01020169                     42                        inc edx
0102016A                   ^ EB B1                     jmp short calc_yua.0102011D
0102016C                     83E9 58                   sub ecx,58
0102016F                     8339 00                   cmp dword ptr ds:[ecx],0
01020172                     75 02                     jnz short calc_yua.01020176
01020174                     EB 05                     jmp short calc_yua.0102017B
01020176                     6A 00                     push 0
01020178                     FF53 40                   call dword ptr ds:[ebx+40]                            ; kernel32.ExitProcess
0102017B                     8BBB A8000000             mov edi,dword ptr ds:[ebx+A8]                         ; 将压缩体代码放入内存中
01020181                     8BF3                      mov esi,ebx
01020183                     2BB3 A4000000             sub esi,dword ptr ds:[ebx+A4]
01020189                     03B3 F0000000             add esi,dword ptr ds:[ebx+F0]
0102018F                     81C6 E0060000             add esi,6E0
01020195                     33C0                      xor eax,eax
01020197                     833E 00                   cmp dword ptr ds:[esi],0
0102019A                     74 0C                     je short calc_yua.010201A8
0102019C                     FF36                      push dword ptr ds:[esi]
0102019E                     8F07                      pop dword ptr ds:[edi]
010201A0                     83C6 04                   add esi,4
010201A3                     83C7 04                   add edi,4
010201A6                   ^ EB EF                     jmp short calc_yua.01020197
010201A8                     FFB3 9C000000             push dword ptr ds:[ebx+9C]                            ; 将解压代码放入内存中
010201AE                     8BF3                      mov esi,ebx
010201B0                     2BB3 A4000000             sub esi,dword ptr ds:[ebx+A4]
010201B6                     03B3 F0000000             add esi,dword ptr ds:[ebx+F0]
010201BC                     56                        push esi
010201BD                     E8 8E090000               call calc_yua.01020B50
010201C2                     60                        pushad                                                ; 开始解压
010201C3                     8BEB                      mov ebp,ebx
010201C5                     81C5 B0000000             add ebp,0B0
010201CB                     8BD5                      mov edx,ebp
010201CD                     2B55 10                   sub edx,dword ptr ss:[ebp+10]
010201D0                     8955 10                   mov dword ptr ss:[ebp+10],edx
010201D3                     0155 40                   add dword ptr ss:[ebp+40],edx
010201D6                     8DB5 84000000             lea esi,dword ptr ss:[ebp+84]
010201DC                     0116                      add dword ptr ds:[esi],edx
010201DE                     0155 04                   add dword ptr ss:[ebp+4],edx
010201E1                     8B36                      mov esi,dword ptr ds:[esi]
010201E3                     8BBB A8000000             mov edi,dword ptr ds:[ebx+A8]
010201E9                     FFB5 BC000000             push dword ptr ss:[ebp+BC]
010201EF                     FFB5 B8000000             push dword ptr ss:[ebp+B8]
010201F5                     8BD6                      mov edx,esi
010201F7                     8BCF                      mov ecx,edi
010201F9                     8B83 9C000000             mov eax,dword ptr ds:[ebx+9C]
010201FF                     05 A9050000               add eax,5A9
01020204                     FFD0                      call eax
01020206                     61                        popad                                                 ; 解压结束
01020207                     68 00800000               push 8000
0102020C                     6A 00                     push 0
0102020E                     FFB3 9C000000             push dword ptr ds:[ebx+9C]
01020214                     FF53 38                   call dword ptr ds:[ebx+38]                            ; kernel32.VirtualFree
01020217                     68 00800000               push 8000
0102021C                     6A 00                     push 0
0102021E                     FFB3 A8000000             push dword ptr ds:[ebx+A8]
01020224                     FF53 38                   call dword ptr ds:[ebx+38]                            ; kernel32.VirtualFree
01020227                     33C9                      xor ecx,ecx
01020229                     51                        push ecx
0102022A                     51                        push ecx
0102022B                     51                        push ecx
0102022C                     51                        push ecx
0102022D                     51                        push ecx
0102022E                     51                        push ecx
0102022F                     51                        push ecx
01020230                     51                        push ecx
01020231                     83C4 20                   add esp,20
01020234                     68 88A9CBED               push EDCBA988
01020239                     FF93 90000000             call dword ptr ds:[ebx+90]                            ; ntdll.ZwClose反调试
0102023F                     837C24 F0 00              cmp dword ptr ss:[esp-10],0
01020244                   ^ 75 DE                     jnz short calc_yua.01020224
01020246                     8B83 A0000000             mov eax,dword ptr ds:[ebx+A0]
0102024C                     05 5FC30000               add eax,0C35F                                         ; 设置入口点的值为数据区相应值加0C35F
01020251                     8BD3                      mov edx,ebx
01020253                     2B93 A4000000             sub edx,dword ptr ds:[ebx+A4]
01020259                     03C2                      add eax,edx
0102025B                     8BCB                      mov ecx,ebx
0102025D                     81E9 000D0000             sub ecx,0D00
01020263                     83C1 05                   add ecx,5
01020266                     50                        push eax
01020267                     2BC1                      sub eax,ecx
01020269                     C641 FB E9                mov byte ptr ds:[ecx-5],0E9
0102026D                     8941 FC                   mov dword ptr ds:[ecx-4],eax                          ; 设置现入口点，使其跳至入口点，DLL用
01020270                     58                        pop eax
01020271                     5F                        pop edi
01020272                     5E                        pop esi
01020273                     5B                        pop ebx
01020274                     5A                        pop edx
01020275                     59                        pop ecx
01020276                     81C4 00010000             add esp,100
0102027C                     5D                        pop ebp
0102027D                     FFE0                      jmp eax                                               ; 跳至入口点


[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)

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jgaoabc
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2 楼
另外说明一下，我是在OD里编写程序的，在OD里编写程序的最大好处就是动态调试，所见所得。
这个程序里用的反调试不多.也没有用到任何异常.
2011-12-14 08:52
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幻影火
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3 楼
你的程式式不知道為什麼他會再殼層的程式出錯，我想應該是你的antidebug，把防毒軟體當作debugger了
2011-12-14 10:18
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jgaoabc
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4 楼
我用变形后的记事本在装有卡巴、瑞星、小红伞的XP SP3系统中运行都没出错，虽然小红伞是杀的，但是加个数字签名就不杀了。不知道你的系统为什么运行不起来。难道是繁体版本的原因？
2011-12-14 16:29
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youyouyue
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5 楼
求楼主扫盲，这个数字签名怎么回事？能不能具体点啊？
2011-12-16 09:15
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jgaoabc
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6 楼
可以百度下，我以前做过一个动画，附有工具，动画名称叫：【jgaoabc原创】做自己的数字签名
2011-12-16 10:27
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jgaoabc
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7 楼
千脑上关于数字签名的动画是别人上传的,其中的signcode.exe被人绑了木马,是这个地址:http://down.qiannao.com/space/file/513059994/share/-3010jgaoabc-539f-521b-6559-7a0b-3011-505a-81ea-5df1-7684-6570-5b57-7b7e-540d.rar/.page，不要下。
我重新上传了个,地址在:http://down.qiannao.com/space/file/jgaoabc/-4e0a-4f20-5206-4eab/-6b63-5b97-7684-3010jgaoabc-539f-521b-3011-505a-81ea-5df1-7684-6570-5b57-7b7e-540d.rar/.page
2011-12-16 16:03
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youyouyue
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8 楼
谢谢楼主指导！想再问一下杀毒软件是怎样分析文件数字签名的有效性呢？关于数字签名的密码学理论知识我很清楚，到具体微软和杀毒软件的判定方法我就不懂了，还望楼主启发式的谈谈，不甚感激！
2011-12-16 16:37
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jgaoabc
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9 楼
象360和小红伞之类的杀毒软件，做免杀的时候可以试试数字签名，具体原理不怎么清楚。
2011-12-16 17:16
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幻影火
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10 楼
我的是comodo，和eset，本身都有hook API，和HIPS、firewall功能。可能是因為這樣被你的當作debugger

對了，我還有測試過，北斗未變形之前linux的wine可以執行，變形之後，無法執行。
2011-12-17 11:25
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