Pespin v1.0外壳完全分析

【目标】: PeSpin 1.0主程序

【工具】:Olydbg1.1

【任务】:抓它的衣服个光光.哈哈

【操作平台】:WINXP pro sp1

【作者】:loveboom[DFCG][FCG][US]

【简要说明】:不知不觉就过了这么久了，很久没写什么文章。看到别的朋友们在不断的进步，我都感觉自己是不是真的老了哦:-).写这篇文章也算是给大家中秋节的一个礼物吧，祝大家中秋快乐!身体健康!工作顺利!!

【详细过程】:

设置没什么特别，因为这次想稍微看细一点，所以是慢慢的来跟。打开全部的异常就行了。

00410087 > 90 NOP ; EP,壳入口,是垃圾代码，所以我直接nop掉它了

00410088 90 NOP

00410089 90 NOP

0041008A 60 PUSHAD

0041008B E8 00000000 CALL 00410090

00410090 8B1C24 MOV EBX,DWORD PTR SS:[ESP] ; 这里就就是pop ebx

00410093 83C3 12 ADD EBX,12

00410096 812B E8B10600 SUB DWORD PTR DS:[EBX],6B1E8 ; 这里开始就动态改变代码

0041009C FE4B FD DEC BYTE PTR DS:[EBX-3]

0041009F 812C24 E02A4000 SUB DWORD PTR SS:[ESP],00402AE0

004100A6 DC9E 83B17501 FCOMP QWORD PTR DS:[ESI+175B183]

004100AC 90 NOP

004100AD 8173 04 D77AF72>XOR DWORD PTR DS:[EBX+4],2FF77AD7 ; 又是动态生成代码

004100B4 8173 19 770043B>XOR DWORD PTR DS:[EBX+19],B7430077

004100BB 81C3 28000000 ADD EBX,28

004100C1 F9 STC ; 设置C标志

004100C2 FFE3 JMP EBX

004100C4 C9 LEAVE

004100C5 C2 0800 RETN 8

004100C8 90 NOP

004100C9 90 NOP

004100CA 72 01 JB SHORT 004100CD ; 其实就是jmp xxx,因为上面已经设置了C标志

004100CC 90 NOP

004100CD 5D POP EBP

004100CE 33C9 XOR ECX,ECX

004100D0 41 INC ECX

004100D1 E2 17 LOOPD SHORT 004100EA

004100D3 /EB 07 JMP SHORT 004100DC

004100D5 |90 NOP

004100D6 |EB 01 JMP SHORT 004100D9

004100D8 |90 NOP

004100D9 |EB 0D JMP SHORT 004100E8

004100DB |90 NOP

004100DC \E8 01000000 CALL 004100E2

004100E1 90 NOP

004100E2 5A POP EDX

004100E3 83EA 0B SUB EDX,0B

004100E6 FFE2 JMP EDX ; 这个壳里好多这样的东西哦

004100F1 8B95 D2424000 MOV EDX,DWORD PTR SS:[EBP+4042D2] ; [EBP+4042D2]=4042d2+d5b0处存放的就是程序的IMGBASE

004100F7 8B42 3C MOV EAX,DWORD PTR DS:[EDX+3C] ; 这里不就是取PE所以在的地方+3C

004100FA 03C2 ADD EAX,EDX ; 相加后就是PE文件的开始处了

004100FC 8985 DC424000 MOV DWORD PTR SS:[EBP+4042DC],EAX ; PE文件开始处4000D0处入[EBP+4042DC]处

00410102 EB 02 JMP SHORT 00410106

00410104 90 NOP

00410105 90 NOP

00410106 F9 STC ; 这里也是明显的变形jmp

00410107 72 08 JB SHORT 00410111

00410109 73 0E JNB SHORT 00410119

0041010B F9 STC

0041010C 830424 17 ADD DWORD PTR SS:[ESP],17

00410110 C3 RETN

00410111 E8 04000000 CALL 0041011A

00410116 90 NOP

00410117 F5 CMC

00410118 73 11 JNB SHORT 0041012B ; 又是一堆垃圾代码

0041011A EB 06 JMP SHORT 00410122

0041011C 90 NOP

0041011D ^ 72 ED JB SHORT 0041010C

0041011F 1F POP DS ; Modification of segment register

00410120 EB 07 JMP SHORT 00410129

00410122 F5 CMC ; 这里也就是清除c标志，所以下面也不会跳(实际是取反)

00410123 72 0E JB SHORT 00410133

00410125 F5 CMC ; 再次取反，这次下面就会跳了

00410126 ^ 72 F8 JB SHORT 00410120

00410128 90 NOP

00410129 ^ EB EC JMP SHORT 00410117

0041012B 830424 07 ADD DWORD PTR SS:[ESP],7

0041012F F5 CMC

00410130 FF3424 PUSH DWORD PTR SS:[ESP] ; PESpin.0041011D

00410133 C3 RETN

00410134 41 INC ECX

00410135 C1E1 07 SHL ECX,7

00410138 8B0C01 MOV ECX,DWORD PTR DS:[ECX+EAX] ; 取code段的start address

0041013B 03CA ADD ECX,EDX ; ecx就是保存CODE段的开始RVA

……

0041014E 8B59 10 MOV EBX,DWORD PTR DS:[ECX+10]

00410151 03DA ADD EBX,EDX

00410153 8B1B MOV EBX,DWORD PTR DS:[EBX]

00410155 899D F0424000 MOV DWORD PTR SS:[EBP+4042F0],EBX ; [EBP+4042F0]存放MessageBox的地址?

0041015B 53 PUSH EBX

0041015C 8F85 94414000 POP DWORD PTR SS:[EBP+404194] ; [EBP+404194]存放MessageBox的地址?

00410162 BB E1000000 MOV EBX,0E1

00410167 B9 8C0B0000 MOV ECX,0B8C ; 传入要解压的SIZE

0041016C 8DBD 80434000 LEA EDI,DWORD PTR SS:[EBP+404380]

00410172 4F DEC EDI

00410173 EB 01 JMP SHORT 00410176

00410175 90 NOP

00410176 301C39 XOR BYTE PTR DS:[ECX+EDI],BL ; 从4124BB处开始解压大小为0b8c的代码,是向上解压

00410179 FECB DEC BL

0041017B ^ E2 F9 LOOPD SHORT 00410176

……

00410180 68 CB000000 PUSH 0CB

00410185 59 POP ECX ; mov ecx,0cb

00410186 8DBD 404E4000 LEA EDI,DWORD PTR SS:[EBP+404E40] ; 把刚才解压后的起始地址41192F传人EDI

……

0041019D C00C39 02 ROR BYTE PTR DS:[ECX+EDI],2 ; 41192f+0CB=4124bb(上面的结束地址)处的值ror 2

004101A1 ^ E2 FA LOOPD SHORT 0041019D ; 这里再次从4124BB处解压大小为0CB的代码

……

004101A1 ^\E2 FA LOOPD SHORT 0041019D ; 这里再次从4124BB处解压大小为0CB的代码

004101A3 E8 02000000 CALL 004101AA ; 到这里还是只解压壳的部分代码

004101A8 90 NOP

004101A9 90 NOP

004101AA 5A POP EDX ; mov edx,401A8

004101AB 8D85 FD685600 LEA EAX,DWORD PTR SS:[EBP+5668FD] ; [EBP+5668FD]=D5B0+5668FD=573EAD地址入eax中

004101B1 BB 54130B00 MOV EBX,0B1354

004101B6 D1E3 SHL EBX,1

004101B8 2BC3 SUB EAX,EBX

004101BA FFE0 JMP EAX ; PESpin.00411805

……

00411820 66:813F 4D5A CMP WORD PTR DS:[EDI],5A4D ; 这里通过循环找kernel32.dll的KERNEL BASE(77e410000)

00411825 75 11 JNZ SHORT 00411838 ; 如果找到了就不跳

00411827 0FB757 3C MOVZX EDX,WORD PTR DS:[EDI+3C]

0041182B 66:F7C2 00F8 TEST DX,0F800 ; 比较KERBASE+3C处是不是0f800

00411830 75 06 JNZ SHORT 00411838 ; 如果不是就跳,这里没有跳

00411832 3B7C3A 34 CMP EDI,DWORD PTR DS:[EDX+EDI+34]

00411836 74 08 JE SHORT 00411840 ; 这里再次判断KERNEL32.DLL的imgbase对不对

00411838 81EF 00000100 SUB EDI,10000 ; UNICODE "ALLUSERSPROFILE=D:\Documents and Settings\All Users"

0041183E ^ EB E0 JMP SHORT 00411820

00411840 97 XCHG EAX,EDI ; 如果找到就把EAX和edi的值互换一下

00411857 50 PUSH EAX ; push KERNEL BASE

00411858 8785 F4424000 XCHG DWORD PTR SS:[EBP+4042F4],EAX ; 把KERNEL BASE保存到[EBP+4042F4]=4118A4处.

0041185E 016C24 04 ADD DWORD PTR SS:[ESP+4],EBP

00411862 8D85 FB9883EB LEA EAX,DWORD PTR SS:[EBP+EB8398FB]

00411868 8D80 BDAABC14 LEA EAX,DWORD PTR DS:[EAX+14BCAABD] ; 411968

0041186E EB 01 JMP SHORT 00411871

00411870 90 NOP

00411871 FFD0 CALL EAX ; 这里也就是CALL 411968，这里进去就是通过循环的方法来获取KERNEL32.DLL的输出表来找到所要用到的输出函数。

我们进去看看:

0041196E 8BF0 MOV ESI,EAX

00411970 0340 3C ADD EAX,DWORD PTR DS:[EAX+3C] ; e_lfanew

00411973 8B40 78 MOV EAX,DWORD PTR DS:[EAX+78] ; RVA Export Table

00411976 03C6 ADD EAX,ESI ; 输出表的位置的RVA=6D040

00411978 FF70 20 PUSH DWORD PTR DS:[EAX+20] ; 定位AddressofName=6DF20

0041197B 5B POP EBX

0041197C 03DE ADD EBX,ESI

0041197E FF70 18 PUSH DWORD PTR DS:[EAX+18] ; NumberofNames ==03AE

00411981 8F85 46444000 POP DWORD PTR SS:[EBP+404446] ; MOV [ebp+404446],03AE(4119F6)

00411987 FF70 24 PUSH DWORD PTR DS:[EAX+24] ; AddressOfNameOrdianls=6EDD8

0041198A 5A POP EDX ; mov edx,addressofnameordinals

0041198B 03D6 ADD EDX,ESI ; 转换成VA

0041198D FF70 1C PUSH DWORD PTR DS:[EAX+1C] ; AddressOfFunctions=6D068

00411990 59 POP ECX ; mov ecx,AddressOfFunctions

00411991 03CE ADD ECX,ESI

00411993 898D 36444000 MOV DWORD PTR SS:[EBP+404436],ECX ; 保存AddressOfFunctions到[EBP+404436]处

00411999 83EF 05 SUB EDI,5

0041199C 83C7 05 ADD EDI,5

0041199F 833F 00 CMP DWORD PTR DS:[EDI],0 ; 如果取完了就跳

004119A2 74 71 JE SHORT 00411A15

004119A4 8A07 MOV AL,BYTE PTR DS:[EDI]

004119A6 8885 1D444000 MOV BYTE PTR SS:[EBP+40441D],AL

004119AC FF77 01 PUSH DWORD PTR DS:[EDI+1]

……

004119C6 8B3B MOV EDI,DWORD PTR DS:[EBX] ; AddressOfNames保存到EDI中

004119C8 03FE ADD EDI,ESI

……

00411A00 5B POP EBX

00411A01 0BC0 OR EAX,EAX ; 判断取出的结果是为为空，如果为空就跳

00411A03 74 12 JE SHORT 00411A17

00411A05 EB 01 JMP SHORT 00411A08

00411A07 90 NOP

00411A08 8038 CC CMP BYTE PTR DS:[EAX],0CC ; 判断我们有没有在相关api处下cc断点

00411A0B 75 03 JNZ SHORT 00411A10

00411A0D 8028 00 SUB BYTE PTR DS:[EAX],0 ; 如果发现你在相关的API处下断了，就把应该放的API地址给清0

00411A10 8947 01 MOV DWORD PTR DS:[EDI+1],EAX ; 如果没有就从4118b4处开始写入相关的API

00411A13 ^ EB 87 JMP SHORT 0041199C

00411A15 0BC0 OR EAX,EAX

00411A17 EB 01 JMP SHORT 00411A1A ; 取完后返回去了

00411A19 90 NOP

00411A1A C3 RETN

这里取了这么几个API：

kernel32.LoadLibraryA

kernel32.ExitProcess

kernel32.GetProcAddress

kernel32.VirtualProtect

kernel32.CloseHandle

kernel32.VirtualAlloc

kernel32.VirtualFree

kernel32.CreateFileA

kernel32.ReadFile

kernel32.GetTickCount

kernel32.GetModuleHandleA

kernel32.CreateThread

kernel32.Sleep

kernel32.GetCurrentProcessId

kernel32.OpenProcess

kernel32.TerminateProcess

kernel32.GetFileSize

kernel32.GetModuleFileNameA

……

00411F25 301F XOR BYTE PTR DS:[EDI],BL ; 从4102C4处开始向下解压大小为421的代码

00411F27 47 INC EDI

00411F28 ^ E2 F1 LOOPD SHORT 00411F1B

00411F2A 830424 05 ADD DWORD PTR SS:[ESP],5

00411F2E C3 RETN ; 解压后跳去解压后的地址4102c4

……

004102F7 53 PUSH EBX ; 这里准备异常,EBX就是完全地方

004102F8 50 PUSH EAX

……

00410301 B9 13000000 MOV ECX,13

00410306 E8 00000000 CALL 0041030B

0041030B 5F POP EDI

0041030C 83EF 0A SUB EDI,0A

0041030F BE 54194100 MOV ESI,00411954

00410314 F3:A4 REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[ESI] ; 把411954处的代码复制13个到410301开始的地方

…….

00410334 5B POP EBX ; mov ebx,410334

00410335 81C3 1E000000 ADD EBX,1E ; ebx=410334+1e

0041033B 8DB5 502A4000 LEA ESI,DWORD PTR SS:[EBP+402A50] ; mov esi,410000

00410341 68 FF000000 PUSH 0FF

00410346 56 PUSH ESI

00410347 6A 00 PUSH 0

00410349 53 PUSH EBX ; push 410351

0041034A FFA5 59434000 JMP DWORD PTR SS:[EBP+404359] ; GetModuleFileNameA

这里也就是:

0012FF94 00410351 /CALL to GetModuleFileNameA

0012FF98 00000000 |hModule = NULL

0012FF9C 00410000 |PathBuffer = PESpin.00410000

0012FFA0 000000FF \BufSize = FF (255.)

410000处存放path,取出程序的完整路径和程序名，结果存放在410000处。

00410358 81C3 22000000 ADD EBX,22 ; 比较有意思壳调用API的都用这种方式，这里运算后的值就是等下要返回的地址

0041035E 6A 00 PUSH 0

00410360 68 80000000 PUSH 80

00410365 6A 03 PUSH 3

00410367 6A 00 PUSH 0

00410369 6A 01 PUSH 1

0041036B 68 00000080 PUSH 80000000

00410370 56 PUSH ESI

00410371 53 PUSH EBX

00410372 - FFA5 27434000 JMP DWORD PTR SS:[EBP+404327] ; CreateFileA

我这里是这样的:

0012FF84 00410378 /CALL to CreateFileA

0012FF88 00410000 |FileName = "G:\ctools\加壳\PesPin1.0\PESpin.exe"

0012FF8C 80000000 |Access = GENERIC_READ

0012FF90 00000001 |ShareMode = FILE_SHARE_READ

0012FF94 00000000 |pSecurity = NULL

0012FF98 00000003 |Mode = OPEN_EXISTING

0012FF9C 00000080 |Attributes = NORMAL

0012FFA0 00000000 \hTemplateFile = NULL

00410378 E8 01000000 CALL 0041037E

0041037D 90 NOP

0041037E 5A POP EDX

0041037F 81C2 1A000000 ADD EDX,1A ; 这里又来了,又是用这种方法来调用API

00410385 8985 2C4F4000 MOV DWORD PTR SS:[EBP+404F2C],EAX ; 把CreateFileA后返回的值传入[EBP+4042C]处

0041038B 93 XCHG EAX,EBX

0041038C 6A 00 PUSH 0

0041038E 53 PUSH EBX ; push 文件的句柄

0041038F 52 PUSH EDX ; 这里是要返回的地址

00410390 - FFA5 54434000 JMP DWORD PTR SS:[EBP+404354] ; GetFileSize

0012FF98 00410397 /CALL to GetFileSize

0012FF9C 00000038 |hFile = 00000038 (window)

0012FFA0 00000000 \pFileSizeHigh = NULL

00410397 E8 01000000 CALL 0041039D

0041039C 90 NOP

0041039D 5A POP EDX

0041039E 81C2 23000000 ADD EDX,23 ; CALL API后要返回的地址,4103bf

004103A4 8BD8 MOV EBX,EAX ; 文件大小入EBX中

004103A6 53 PUSH EBX

004103A7 8F85 384F4000 POP DWORD PTR SS:[EBP+404F38] ; 也就把文件大小B600存入[EBP+404F38]中

004103AD 6A 04 PUSH 4

004103AF 68 00300000 PUSH 3000

004103B4 50 PUSH EAX

004103B5 6A 00 PUSH 0

004103B7 52 PUSH EDX

004103B8 FFA5 1D434000 JMP DWORD PTR SS:[EBP+40431D] ; 这里开始分配一个文件大小的空间

0012FF90 004103BF /CALL to VirtualAlloc

0012FF94 00000000 |Address = NULL

0012FF98 0000B600 |Size = B600 (46592.)

0012FF9C 00003000 |AllocationType = MEM_COMMIT|MEM_RESERVE

0012FFA0 00000004 \Protect = PAGE_READWRITE

申请返回的地址是:003E0000.

004103BF 50 PUSH EAX

004103C0 8F85 D8424000 POP DWORD PTR SS:[EBP+4042D8] ; [EBP+4042D8]处保存申请后的地址003E0000

004103C6 8D8D 384F4000 LEA ECX,DWORD PTR SS:[EBP+404F38] ; 把文件大小的地址传入ecx中

004103CC E8 01000000 CALL 004103D2

004103D1 90 NOP

004103D2 5A POP EDX

004103D3 81C2 1C000000 ADD EDX,1C ; CALL API后要返回的地址4103ED

004103D9 6A 00 PUSH 0 ; 这里开始通过ReadFile把文件读入刚才申请的地址003e0000处

004103DB 51 PUSH ECX

004103DC 53 PUSH EBX

004103DD 50 PUSH EAX

004103DE FFB5 2C4F4000 PUSH DWORD PTR SS:[EBP+404F2C]

004103E4 52 PUSH EDX

004103E5 FFA5 2C434000 JMP DWORD PTR SS:[EBP+40432C] ; ReadFile

004103ED E8 01000000 CALL 004103F3

004103F2 90 NOP

004103F3 5A POP EDX

004103F4 81C2 16000000 ADD EDX,16

004103FA FFB5 2C4F4000 PUSH DWORD PTR SS:[EBP+404F2C] ; push文件号

00410400 52 PUSH EDX ; push要返回的地址410408

00410401 - FFA5 18434000 JMP DWORD PTR SS:[EBP+404318] ; 操作完成就CloseHandle了

00410407 90 NOP

00410408 FFB5 384F4000 PUSH DWORD PTR SS:[EBP+404F38] ; 文件大小入ecx了

0041040E 59 POP ECX

0041040F 81E9 111B0000 SUB ECX,1B11 ; 用文件大小b600-1b11=9AEF

00410415 8DBD D8424000 LEA EDI,DWORD PTR SS:[EBP+4042D8]

0041041B 8B3F MOV EDI,DWORD PTR DS:[EDI] ; 申请的地址3E0000入edi中

0041041D 8D85 0B616038 LEA EAX,DWORD PTR SS:[EBP+3860610B]

00410423 0BC0 OR EAX,EAX

00410425 75 19 JNZ SHORT 00410440 ; 这里实际也是一个jmp来的

00410447 2985 404F4000 SUB DWORD PTR SS:[EBP+404F40],EAX ; 保存hash值58873d42?? [EBP+404F40]= 58873d42

0041044D E8 01000000 CALL 00410453

00410452 90 NOP

00410453 5A POP EDX

00410454 81C2 1C000000 ADD EDX,1C

0041045A 68 00800000 PUSH 8000

0041045F 6A 00 PUSH 0

00410461 FFB5 D8424000 PUSH DWORD PTR SS:[EBP+4042D8] ; push 003E0000

00410467 52 PUSH EDX ; push返回地址41046E

00410468 FFA5 22434000 JMP DWORD PTR SS:[EBP+404322] ; 这里释放刚才申请的空间003E0000

0041046E BB 380D581C MOV EBX,1C580D38 ; 前的取出文件操作的只是为了得到一个hash值??

……

00410492 64:8920 MOV DWORD PTR FS:[EAX],ESP ; 有意思，这里的异常，是通过call的那个esp值+ebp的

00410495 C1EB 02 SHR EBX,2 ; 上面其实就是设置 SEH句柄为4104ba

…….

004104BA 8B4424 04 MOV EAX,DWORD PTR SS:[ESP+4] ; 这里几个是什么作用我也不知道;-(

004104BE 8B4C24 0C MOV ECX,DWORD PTR SS:[ESP+C]

004104C2 8B00 MOV EAX,DWORD PTR DS:[EAX]

004104C4 35 5B011238 XOR EAX,3812015B

004104C9 3D 5E0112F8 CMP EAX,F812015E

004104CE 75 0F JNZ SHORT 004104DF ; 这里不相等

004104D0 8181 B8000000 B>ADD DWORD PTR DS:[ECX+B8],18BF

004104DA EB 27 JMP SHORT 00410503

004104DC EB 01 JMP SHORT 004104DF

004104DE 90 NOP

004104DF 3D 460112F8 CMP EAX,F8120146 ; EAX==F81201CF

004104E4 75 0C JNZ SHORT 004104F2

004104E6 8181 B8000000 7>ADD DWORD PTR DS:[ECX+B8],172

004104F0 EB 11 JMP SHORT 00410503

004104F2 3D CF0112F8 CMP EAX,F81201CF

004104F7 75 0A JNZ SHORT 00410503

004104F9 8181 B8000000 9>ADD DWORD PTR DS:[ECX+B8],1490

00410503 33C0 XOR EAX,EAX

00410505 C3 RETN

这里再回到411931处

……

00411942 803B CC CMP BYTE PTR DS:[EBX],0CC ; 这里判断4104a4处有没有下断点

00411945 75 0B JNZ SHORT 00411952 ; 如果没有就跳

00411947 81E4 FFFF0000 AND ESP,0FFFF

0041194D E8 1A000000 CALL 0041196C

00411952 ^ FFE3 JMP EBX ; 跳回去继续执行

……

00410549 90 NOP

0041054A 51 PUSH ECX ; push要解压的section值，ECX==4

0041054B 0FA3C3 BT EBX,EAX ; 如果ebx内容为空就c标志为0，否则CF=1,我们这里EBX=7

0041054E 73 24 JNB SHORT 00410574 ; 如果段不需要解压就跳

00410550 52 PUSH EDX ; 这里开始解压各个section的数据

00410551 8B7A 0C MOV EDI,DWORD PTR DS:[EDX+C] ; 第一次的结果:

00410554 03BD D2424000 ADD EDI,DWORD PTR SS:[EBP+4042D2] ; 传入要写起始的地址401000

0041055A 8B4A 10 MOV ECX,DWORD PTR DS:[EDX+10] ; 传入要写的代码SIZE==5200也就是解压.text段的大小

0041055D 8B95 404F4000 MOV EDX,DWORD PTR SS:[EBP+404F40] ; 这里取出上面hash的值,传入edx中

00410563 D1EA SHR EDX,1

00410565 72 06 JB SHORT 0041056D

00410567 81F2 32AF43ED XOR EDX,ED43AF32

0041056D 3017 XOR BYTE PTR DS:[EDI],DL

0041056F 47 INC EDI

00410570 49 DEC ECX

00410571 ^ E2 F0 LOOPD SHORT 00410563 ; 这里循环进行解压代码

00410573 5A POP EDX ; 如果解压到前一个section,的话，就指向下一个section

00410574 40 INC EAX

00410575 83C2 28 ADD EDX,28

00410578 59 POP ECX

00410579 EB 01 JMP SHORT 0041057C

0041057B 40 INC EAX

0041057C ^ E2 CC LOOPD SHORT 0041054A ; 这时循环回去

0041057E 838D 3A4E4000 0>OR DWORD PTR SS:[EBP+404E3A],0

00410585 74 0D JE SHORT 00410594

00410587 8D85 DA4B4000 LEA EAX,DWORD PTR SS:[EBP+404BDA]

0041058D 2D D1030000 SUB EAX,3D1

00410592 FFD0 CALL EAX

00410594 68 19010000 PUSH 119

00410599 59 POP ECX

0041059A 8DBD BC4A4000 LEA EDI,DWORD PTR SS:[EBP+404ABC] ; 从41206c处解压大小为119的代码

004105A0 BA E9909E01 MOV EDX,19E90E9

004105A5 D1EA SHR EDX,1

004105A7 73 06 JNB SHORT 004105AF

004105A9 81F2 32AF43ED XOR EDX,ED43AF32

004105AF 3017 XOR BYTE PTR DS:[EDI],DL

004105B1 47 INC EDI ; PESpin.00412070

004105B2 ^ E2 F1 LOOPD SHORT 004105A5 ; 如果没有解压完成就跳回去解压

004105B4 8D85 5C888D65 LEA EAX,DWORD PTR SS:[EBP+658D885C]

……

004105BF D1E3 SHL EBX,1

004105C1 2BC3 SUB EAX,EBX

004105C3 50 PUSH EAX ; 跳去已经解压的地方41206c

004105C4 C3 RETN

……

0041206C /EB 01 JMP SHORT 0041206F ; 解压一段运行一段

0041206E |90 NOP

0041206F \8DBD 15304000 LEA EDI,DWORD PTR SS:[EBP+403015] ; 又要解压代码了,开始解压地址4105c5

00412075 B9 20010000 MOV ECX,120 ; 要解压的代码大小为120

……

004120A4 /EB 01 JMP SHORT 004120A7

004120A6 |90 NOP

004120A7 \0AC0 OR AL,AL

004120A9 AA STOS BYTE PTR ES:[EDI]

004120AA ^ E2 D7 LOOPD SHORT 00412083 ; 感觉这里自己像是yoda's cryptor

解压完后进入第三个异常.

…….

00412132 64:8923 MOV DWORD PTR FS:[EBX],ESP

00412135 FB STI ; 到了第三个异常

……

004120AA ^\E2 D7 LOOPD SHORT 00412083 ; 感觉这里自己像是yoda's cryptor

004120AC 55 PUSH EBP

004120AD 9C PUSHFD

004120AE E8 77000000 CALL 0041212A

004120B3 90 NOP

004120B4 8B5424 08 MOV EDX,DWORD PTR SS:[ESP+8] ; 直接在这里下断就行了

004120B8 8B4424 0C MOV EAX,DWORD PTR SS:[ESP+C]

004120BC 8142 04 3500000>ADD DWORD PTR DS:[EDX+4],35 ; 注意这里，作者的异常都用这一招的,在目标地址里的那个值处下断

004120C3 81CA 29242123 OR EDX,23212429

004120C9 2BC9 SUB ECX,ECX

004120CB 2148 04 AND DWORD PTR DS:[EAX+4],ECX ; 清除断点

004120CE 2148 08 AND DWORD PTR DS:[EAX+8],ECX

004120D1 2148 0C AND DWORD PTR DS:[EAX+C],ECX

004120D4 2148 10 AND DWORD PTR DS:[EAX+10],ECX

004120D7 8160 14 F00FFFF>AND DWORD PTR DS:[EAX+14],FFFF0FF0

004120DE C740 18 5501000>MOV DWORD PTR DS:[EAX+18],155

004120E5 33C0 XOR EAX,EAX

004120E7 C3 RETN

……

004120E9 8B5424 08 MOV EDX,DWORD PTR SS:[ESP+8]

004120ED 8142 04 1B00000>ADD DWORD PTR DS:[EDX+4],1B ; 这里又异常了,看来作者也等不及了,哈哈

004120F4 EB 01 JMP SHORT 004120F7

……

00412142 8DBD 35314000 LEA EDI,DWORD PTR SS:[EBP+403135] ; EDI=4106E5

00412148 B9 240C0000 MOV ECX,0C24 ; 又准备从4106E5处解压代码,大小为0C24

……

0041217C AA STOS BYTE PTR ES:[EDI]

0041217D ^ E2 D7 LOOPD SHORT 00412156 ; 如果没有解压完就跳回去

……

004105E1 68 07000000 PUSH 7

004105E6 5B POP EBX ; mov ebx,7

……

004105E7 25 25382C37 AND EAX,372C3825

又回来解密一层

00411D55 64:8923 MOV DWORD PTR FS:[EBX],ESP

00411D58 83E0 00 AND EAX,0

00411D5B 64:3343 30 XOR EAX,DWORD PTR FS:[EBX+30] ; 晕哦，作者这里连来几个异常

一堆垃圾过后到第七个异常处

……

004104CE /75 0F JNZ SHORT 004104DF ; 这里不相等

004104D0 |8181 B8000000 B>ADD DWORD PTR DS:[ECX+B8],18BF ; 这里再次改东西

记住改后的地址，然后在那个地址处下断:

00411F81 2BC0 SUB EAX,EAX

00411F83 90 NOP

00411F84 90 NOP

00411F85 90 NOP

00411F86 90 NOP

00411F87 90 NOP

00411F88 90 NOP

00411F89 90 NOP

00411F8A 90 NOP

00411F8B 90 NOP

00411F8C 64:8F00 POP DWORD PTR FS:[EAX]

00411F8F 58 POP EAX

00411F90 5D POP EBP

00411F91 8D85 35314000 LEA EAX,DWORD PTR SS:[EBP+403135] ; mov EAX,4106E5

00411F97 68 240C0000 PUSH 0C24

00411F9C 59 POP ECX ; mov ECX,0C24

00411F9D 68 9952B30E PUSH 0EB35299

00411FA2 5A POP EDX

00411FA3 D1EA SHR EDX,1

00411FA5 73 06 JNB SHORT 00411FAD

00411FA7 81F2 32AF43ED XOR EDX,ED43AF32 ; 从4106E5 处解压代码大小为0c24

00411FAD 3010 XOR BYTE PTR DS:[EAX],DL ; 这里又解压一层代码,tnnd压的还真多

00411FAF 40 INC EAX

00411FB0 ^ E2 F1 LOOPD SHORT 00411FA3

00411FB2 2D 240C0000 SUB EAX,0C24

00411FB7 FFE0 JMP EAX ; 解压完后跳回去执行解压后的代码

现在我会可以总结一下，在第七次异常后按CTRL+S找

SUB EAX,0C24

JMP EAX

处下断就是了.

……

下慢慢跟，注意，过那jmp eax后就不要去除垃圾代码了，要不会异常的.

004122D6 B9 522D0000 MOV ECX,2D52 ; 传入将要VirutalAlloc的size 2D52

004122DB 8BD1 MOV EDX,ECX

004122DD EB 07 JMP SHORT 004122E6

004122FA 96 XCHG EAX,ESI ; 分配出来的空间就是3E0000，把分配好的地址入esi中

004122FB 5A POP EDX ; 把要分配的大小2d52入edx中

004122FC BF F0D30000 MOV EDI,0D3F0

00412301 81C7 00004000 ADD EDI,00400000

00412307 56 PUSH ESI ; push 3E0000

00412308 57 PUSH EDI ; push 40D3F0

00412309 E8 83E7FFFF CALL 00410A91 ; 解压代码到刚才分配的空间里,这就是真正的Depack了,aplib v0.36的解压代码.

0041230E 91 XCHG EAX,ECX ; 把解压的大小传入ecx，用于下面的复制代码

0041230F F3:A4 REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[>

00412311 5F POP EDI ; 操作完毕还原edi和esi的值

00412312 5E POP ESI

00412313 EB 01 JMP SHORT 00412316

00412315 90 NOP

00412316 68 00400000 PUSH 4000

0041231B 52 PUSH EDX

0041231C 56 PUSH ESI

0041231D FF95 22434000 CALL DWORD PTR SS:[EBP+404322] ; 解压代码完毕后，再次释放刚申请的空间

00412323 EB 01 JMP SHORT 00412326

00412325 90 NOP

00412335 8338 00 CMP DWORD PTR DS:[EAX],0 ; 判断412370里面有没有东西，没有就跳

00412338 0F84 95000000 JE 004123D3

0041233E B9 C09D0000 MOV ECX,9DC0 ; push size 9dc0

00412343 6A 04 PUSH 4

00412345 68 00300000 PUSH 3000

0041234A 51 PUSH ECX

0041234B 6A 00 PUSH 0 ; 准备再次申请空间

0041234D FF95 1D434000 CALL DWORD PTR SS:[EBP+40431D] ; VirtualAlloc

0012FF8C 00412353 /CALL to VirtualAlloc from PESpin.0041234D

0012FF90 00000000 |Address = NULL

0012FF94 00009DC0 |Size = 9DC0 (40384.)

0012FF98 00003000 |AllocationType = MEM_COMMIT|MEM_RESERVE

0012FF9C 00000004 \Protect = PAGE_READWRITE

……

0041238A 03BD D2424000 ADD EDI,DWORD PTR SS:[EBP+4042D2] ; 晕哦，又脱一层马甲:-)

00412390 BE 00009000 MOV ESI,900000

00412395 56 PUSH ESI

00412396 57 PUSH EDI

00412397 E8 F5E6FFFF CALL 00410A91 ; 这里又进行apLib解压代码.

004123B6 8B8D 8F4D4000 MOV ECX,DWORD PTR SS:[EBP+404D8F] ; 解压完毕，再次释放刚才的空间900000

004123BC 8B85 E14D4000 MOV EAX,DWORD PTR SS:[EBP+404DE1]

004123C2 0BC0 OR EAX,EAX

004123C4 74 0D JE SHORT 004123D3

004123C6 68 00400000 PUSH 4000

004123CB 51 PUSH ECX ; push size

004123CC 56 PUSH ESI ; push address

004123CD FF95 22434000 CALL DWORD PTR SS:[EBP+404322] ; kernel32.VirtualFree

……

0012FF90 004123D3 /CALL to VirtualFree from PESpin.004123CD

0012FF94 00900000 |Address = 00900000

0012FF98 00009DC0 |Size = 9DC0 (40384.)

0012FF9C 00004000 \FreeType = MEM_DECOMMIT

……

0012FF88 00411C71 /CALL to VirtualProtect from PESpin.00411C6E

0012FF8C 004001C8 |Address = PESpin.004001C8

0012FF90 0000025C |Size = 25C (604.)

0012FF94 00000040 |NewProtect = PAGE_EXECUTE_READWRITE

0012FF98 004124D8 \pOldProtect = PESpin.004124D8

通过VirtualProtect来把段改为可以读写执行的属性.

00411C9D C643 02 C3 MOV BYTE PTR DS:[EBX+2],0C3

00411CA1 53 PUSH EBX

再小心一点到最后一个异常:

0012FF94 0012FFE0 Pointer to next SEH record

0012FF98 00411CD6 SE handler

在411cd6处下断:

00411CD6 2BDB SUB EBX,EBX

00411CD8 8B6424 08 MOV ESP,DWORD PTR SS:[ESP+8]

00411CDC 64:8F03 POP DWORD PTR FS:[EBX]

……

00411D0F B9 2E000000 MOV ECX,2E

00411D14 FF1401 CALL DWORD PTR DS:[ECX+EAX] ; 这里用GetTickCount不知道起什么作用来的

00411D23 59 POP ECX ; mov ECX,87

00411D24 66:35 4C50 XOR AX,504C

00411D28 66:05 8911 ADD AX,1189

00411D2C AA STOS BYTE PTR ES:[EDI] ; 到了这里还要解压代码

……

00410D3A 8000 81 ADD BYTE PTR DS:[EAX],81

00410D3D E9 0F000000 JMP 00410D51 ; 如果加壳时选择了检测测试器的话，这里会跳去一个int3处

00410D42 C9 LEAVE

00410D43 E8 76000000 CALL 00410DBE

00410D48 0BC0 OR EAX,EAX ; PesPin到现在还不检测OD的存在，不知道为什么

00410D4A ^ 74 ED JE SHORT 00410D39 ; 只是用了两个int3来检测SICE而已

00410D4C - E9 7217FF35 JMP 364024C3

00410D51 EB 01 JMP SHORT 00410D54 ; 加了或没加检测调试器都一定会来这里的.

00410D53 90 NOP

……

00410D54 68 B95734E1 PUSH E13457B9 ; 这里作者还要来骗一下我们

00410D59 EB 01 JMP SHORT 00410D5C

00410D5B 90 NOP

00410D5C 59 POP ECX ; 这里mov ECX,E1345789

00410D5D 90 NOP

……

00410D6E 81E9 B95734E1 SUB ECX,E13457B9 ; 这里又减回去，不就是白做了嘛.

00410D74 0BC9 OR ECX,ECX

00410D76 EB 01 JMP SHORT 00410D79

……

00410D79 9C PUSHFD

00410D7A C12C24 06 SHR DWORD PTR SS:[ESP],6

00410D7E 832424 01 AND DWORD PTR SS:[ESP],1

00410D82 50 PUSH EAX

00410D83 52 PUSH EDX

00410D84 B8 066F7579 MOV EAX,79756F06

00410D89 05 51918A86 ADD EAX,868A9151

00410D8E F76424 08 MUL DWORD PTR SS:[ESP+8] ; 又是垃圾代码来的

00410D92 8D8428 F9374000 LEA EAX,DWORD PTR DS:[EAX+EBP+4037F9]

00410D99 894424 08 MOV DWORD PTR SS:[ESP+8],EAX

00410D9D 5A POP EDX

00410D9E 58 POP EAX

00410D9F 8D6424 04 LEA ESP,DWORD PTR SS:[ESP+4] ; 这里我就有点搞不懂了，直接用jmp [esp]不行吗?最多后面加一个add esp,4

00410DA3 FF6424 FC JMP DWORD PTR SS:[ESP-4] ; 这不是浪费代码吗?

……

00410E09 . F685 3E4E4000 0>TEST BYTE PTR SS:[EBP+404E3E],1

00410E10 . 74 40 JE SHORT 00410E52

00410E12 . BB 3C080000 MOV EBX,83C

00410E17 . 0BDB OR EBX,EBX ;如果是VB的程序的话，壳就是mov ebx,0了

00410E19 . 74 37 JE SHORT 00410E52 ; 这里就是jmp来的，因为上面赋值了，所以这里不可能跳的

00410E1B . 2BC0 SUB EAX,EAX ; eax清0

00410E1D . 2185 E0424000 AND DWORD PTR SS:[EBP+4042E0],EAX

00410E23 . E8 01000000 CALL 00410E29

00410E28 . 90 NOP

00410E29 $ 59 POP ECX ; MOV ECX,410E28

00410E2A . 6A 40 PUSH 40

00410E2C . 68 00300000 PUSH 3000

00410E31 . 53 PUSH EBX ; PUSH SIZE 83C

00410E32 . 50 PUSH EAX

00410E33 . 8D6424 FC LEA ESP,DWORD PTR SS:[ESP-4]

00410E37 . 81C1 23000000 ADD ECX,23

00410E3D . 890C24 MOV DWORD PTR SS:[ESP],ECX ; PUSH ECX,也就是push 要返回的地址

00410E40 .- FFA5 1D434000 JMP DWORD PTR SS:[EBP+40431D] ; VirtualAlloc申请一个内存空间

0012FF90 00410E4B /CALL to VirtualAlloc

0012FF94 00000000 |Address = NULL

0012FF98 0000083C |Size = 83C (2108.)

0012FF9C 00003000 |AllocationType = MEM_COMMIT|MEM_RESERVE

0012FFA0 00000040 \Protect = PAGE_EXECUTE_READWRITE

……

00410E4B 50 PUSH EAX ; 申请到的空间900000入栈

00410E4C 8F85 D8424000 POP DWORD PTR SS:[EBP+4042D8] ; MOV [EBP+4042D8],900000

00410E52 90 NOP ; MOV 410E19,900000

……

00410E66 . E8 01000000 CALL 00410E6C

00410E6B . 90 NOP

00410E6C $ 83C4 04 ADD ESP,4

00410E6F . 8BB5 393B4000 MOV ESI,DWORD PTR SS:[EBP+403B39] ; 输入表RVA起始地址

00410E75 . 03B5 D2424000 ADD ESI,DWORD PTR SS:[EBP+4042D2] ; 转换为VA==40A160

00410E7B . 90 NOP

……

00410E8C . 3BB5 D2424000 CMP ESI,DWORD PTR SS:[EBP+4042D2] ; 判断输入表的起始地址和ImageBase是否相等

00410E92 . 90 NOP

00410E93 . 90 NOP

00410E94 . 90 NOP

00410E9E . 75 0F JNZ SHORT 00410EAF ; 如果不相等则跳

00410EA0 . 90 NOP

00410EAF > 817E 10 C8FB000>CMP DWORD PTR DS:[ESI+10],0FBC8 ; 比较ThunkRVA(A028)是否为0FBC8

00410EB6 . |9C PUSHFD

00410EB7 . |EB 01 JMP SHORT 00410EBA

00410EB9 |90 NOP

00410EBA > |C12C24 06 SHR DWORD PTR SS:[ESP],6

00410EBE . |832424 01 AND DWORD PTR SS:[ESP],1

00410EC2 . |50 PUSH EAX ; 保护好EAX

00410EC3 . |52 PUSH EDX

00410EC4 . |B8 9C7791BE MOV EAX,BE91779C

00410EC9 . |05 798A6E41 ADD EAX,416E8A79

00410ECE . |F76424 08 MUL DWORD PTR SS:[ESP+8]

00410ED2 . |8D8428 38394000 LEA EAX,DWORD PTR DS:[EAX+EBP+403938]

00410ED9 . |894424 08 MOV DWORD PTR SS:[ESP+8],EAX ; 将要跳去的地方410EE8

00410EDD . |5A POP EDX

00410EDE . |58 POP EAX ; 还原现场

00410EDF 8D6424 04 LEA ESP,DWORD PTR SS:[ESP+4] ; 又来让我们的CPU加负担了:-)

00410EE3 . FF6424 FC JMP DWORD PTR SS:[ESP-4] ; jmp 410EE8

00410EE7 90 NOP

00410EE8 . 8B5E 0C MOV EBX,DWORD PTR DS:[ESI+C] ; 定位输入表的NAME==A4C4

00410EEB . 039D D2424000 ADD EBX,DWORD PTR SS:[EBP+4042D2] ; 转换成VA==40A4C4

00410EF1 . 8BFB MOV EDI,EBX ; 把Name入EDI中

00410EF3 . E8 6B0F0000 CALL 00411E63 ; 取出NAME来，我们可以进去看看

00411E63 /$ 57 PUSH EDI ; 保护 EDI(Name的值)

00411E64 |> 800F 00 /OR BYTE PTR DS:[EDI],0 ; 如果取完了Name就返回

00411E67 |. 74 16 |JE SHORT 00411E7F

00411E69 |. 90 |NOP

00411E6A |. 90 |NOP

00411E6B |. 90 |NOP

00411E6C |. 90 |NOP

00411E6D |. 90 |NOP

00411E6E |. 90 |NOP

00411E6F |. 90 |NOP

00411E70 |. 90 |NOP

00411E71 |. 90 |NOP

00411E72 |. 90 |NOP

00411E73 |. 90 |NOP

00411E74 |. 90 |NOP

00411E75 |. 90 |NOP

00411E76 |. 90 |NOP

00411E77 |. 90 |NOP

00411E78 |. 90 |NOP

00411E79 |. 90 |NOP

00411E7A |. F617 |NOT BYTE PTR DS:[EDI] ; NAMAE就是通过取反来还原NAME

00411E7C |. 47 |INC EDI

00411E7D |.^ EB E5 \JMP SHORT 00411E64

00411E7F |> 5F POP EDI ; 恢复现场

00411E80 \. C3 RETN

00410EF8 E8 01000000 CALL 00410EFE

00410EFD 90 NOP

00410EFE 58 POP EAX ; MOV EAX,410EFD

00410EFF 53 PUSH EBX ; push NAME

00410F00 50 PUSH EAX

00410F01 FFB5 04434000 PUSH DWORD PTR SS:[EBP+404304] ; push LoadLibraryA

00410F07 814424 04 1400000>ADD DWORD PTR SS:[ESP+4],14 ; push返回地址410EFD+14=410F11

00410F0F C3 RETN

00410F10 90 NOP

00410F11 85C0 TEST EAX,EAX ; 这是个人觉得应该是BUG来的吧，怎么不先GetModuleHandleA先呢

00410F13 0F84 31080000 JE 0041174A ; 如果载入失败就去出错的地方

00410F19 E8 01000000 CALL 00410F1F

00410F1E 90 NOP

00410F1F 59 POP ECX ; MOV ECX,EIP-1

00410F20 50 PUSH EAX ; PUSH hmodule

00410F21 51 PUSH ECX

00410F22 55 PUSH EBP

00410F23 810424 AE324000 ADD DWORD PTR SS:[ESP],004032AE ; push 41085E

00410F2A 814424 04 2200000>ADD DWORD PTR SS:[ESP+4],22 ; 先进41085E然后返回到410F40处

00410F32 C3 RETN ; 返回41085E处,进去后获取相关DLL的输出表信息

……

00410862 5A POP EDX ; 把hmodule入edx中

00410863 41 INC ECX

00410864 51 PUSH ECX ; push 410F41这里改变后就是返回到410F41了

00410865 57 PUSH EDI ; push Name

00410866 53 PUSH EBX

00410867 8995 31334000 MOV DWORD PTR SS:[EBP+403331],EDX ; 把hmodule保存到[EBP+403331]==4108E1处

0041086D 8BDA MOV EBX,EDX

0041086F 0352 3C ADD EDX,DWORD PTR DS:[EDX+3C] ; 定位e_lfnew(定位pe头)

00410872 FF72 7C PUSH DWORD PTR DS:[EDX+7C]

00410875 8F85 29334000 POP DWORD PTR SS:[EBP+403329] ; 输出表的size入[EBP+403329](4108d9)处

0041087B 8B52 78 MOV EDX,DWORD PTR DS:[EDX+78] ; 定位输出表

0041087E 03D3 ADD EDX,EBX ; 把输出表转换成VA

00410880 52 PUSH EDX

00410881 8F85 25334000 POP DWORD PTR SS:[EBP+403325] ; 输出表起始地址入[EBP+403325](4108d5]处

00410887 90 NOP

00410888 90 NOP

00410889 90 NOP

0041088A 90 NOP

0041088B 90 NOP

0041088C 90 NOP

0041088D 90 NOP

0041088E 90 NOP

0041088F 90 NOP

00410890 FF72 20 PUSH DWORD PTR DS:[EDX+20] ; AddressOfNames

00410893 5F POP EDI

00410894 03FB ADD EDI,EBX ; AddresOfNames转换成VA

00410896 57 PUSH EDI

00410897 8F85 35334000 POP DWORD PTR SS:[EBP+403335]

0041089D FF72 18 PUSH DWORD PTR DS:[EDX+18] ; NumberOfNames

004108A0 8F85 E8334000 POP DWORD PTR SS:[EBP+4033E8]

004108A6 EB 01 JMP SHORT 004108A9

004108A8 90 NOP

004108A9 FF72 1C PUSH DWORD PTR DS:[EDX+1C] ; AddressofFunctions

004108AC 5F POP EDI

004108AD 03FB ADD EDI,EBX ; AddressOfFunctions转为VA

004108AF 57 PUSH EDI

004108B0 8F85 39334000 POP DWORD PTR SS:[EBP+403339] ; 输出表的AddressOfFunctions 入[EBP+403339]

004108B6 FF72 24 PUSH DWORD PTR DS:[EDX+24] ; AddressOfNamesOrdinals

004108B9 5F POP EDI

004108BA 03FB ADD EDI,EBX

004108BC 57 PUSH EDI

004108BD 8F85 2D334000 POP DWORD PTR SS:[EBP+40332D] ; 输出表的AddressOfNamesOrdinals 入[EBP+40332D](004108DD)

004108C3 FF72 10 PUSH DWORD PTR DS:[EDX+10] ; nBase

004108C6 8F85 53334000 POP DWORD PTR SS:[EBP+403353] ; 输出表的Base 入[EBP+403353](00410903)

004108CC EB 01 JMP SHORT 004108CF ; 获取完毕回去操作

第一次是KERNEL32.DLL函数

输出表的SIZE 00006B39入[EBP+403329](4108d9)

输出表起始地址77EAD040入[EBP+403325](4108d5]

输出表的AddressOfNames 77EAD2F0入[EBP+403335](4108E5)

输出表的NumberOfNames 03AE入[EBP+4033E8](00410998)

输出表的AddressOfFunctions 77EAD068入[EBP+403339](004108E9)

输出表的AddressOfNamesOrdinals 77EAEDD8入[EBP+40332D](004108DD)

输出表的Base 1 入[EBP+403353](00410903)

00410F41 2BD2 SUB EDX,EDX ; 清除EDX，这样的方式不会改变标志的

……

00410F70 800B 00 OR BYTE PTR DS:[EBX],0 ; 取完那个DLL后就把函数再给清除掉

00410F73 74 0D JE SHORT 00410F82 ; 如果清完了就跳

00410F75 8813 MOV BYTE PTR DS:[EBX],DL

00410F77 C1C2 04 ROL EDX,4

00410F7A 90 NOP

00410F7B 90 NOP

00410F7C 90 NOP

00410F7D 43 INC EBX

00410F7E ^ FF6424 FC JMP DWORD PTR SS:[ESP-4] ; 这里跳回去直到函数名已经清除完了

……

00410F83 8B56 10 MOV EDX,DWORD PTR DS:[ESI+10] ; 把ThunkRVA入EDX中，并转成VA

00410F86 0395 D2424000 ADD EDX,DWORD PTR SS:[EBP+4042D2]

00410F8C 830A 00 OR DWORD PTR DS:[EDX],0 ; 判断有没有操作完相关的API，操作完了就跳

00410F8F 0F84 32010000 JE 004110C7

00410F95 90 NOP

00410F96 90 NOP

……

00410FB6 0385 D2424000 ADD EAX,DWORD PTR SS:[EBP+4042D2] ; TunkValue转换成VA

00410FBC 97 XCHG EAX,EDI ; ThunkVlue入edi,

00410FBD 68 7AF3D0F9 PUSH F9D0F37A

00410FC2 012C24 ADD DWORD PTR SS:[ESP],EBP

00410FC5 810424 B4466F06 ADD DWORD PTR SS:[ESP],66F46B4

00410FCC 68 D476630F PUSH 0F6376D4

00410FD1 812C24 9643230F SUB DWORD PTR SS:[ESP],0F234396

00410FD8 012C24 ADD DWORD PTR SS:[ESP],EBP

00410FDB C3 RETN ; 跳去填充API函数里,相当于我们的GetProcAddress

进入后发现和以前的版本没什么很大的变化.

……

004108F8 0BFF OR EDI,EDI ; 判断ThunkValue是不是为空，不是则跳

004108FA 75 19 JNZ SHORT 00410915

……

00410921 8B9D 35334000 MOV EBX,DWORD PTR SS:[EBP+403335] ; 输出表的AddresOfNames入EBX

00410927 8A47 FF MOV AL,BYTE PTR DS:[EDI-1]

……

00410959 8B3B MOV EDI,DWORD PTR DS:[EBX] ; 循环搜索相关DLL的输出表

0041095B 03BD 31334000 ADD EDI,DWORD PTR SS:[EBP+403331] ; 取出的输出表转换成VA

…….

00410964 /75 2C JNZ SHORT 00410992

00410966 |E8 B0100000 CALL 00411A1B

0041096B |3D F7DEBCA1 CMP EAX,A1BCDEF7

00410970 |75 20 JNZ SHORT 00410992

00410972 |8B85 2D334000 MOV EAX,DWORD PTR SS:[EBP+40332D] ; 循环得到程序所要的API，找到后到这里

00410978 |D1E1 SHL ECX,1

0041097A |03C1 ADD EAX,ECX

0041097C |0FB700 MOVZX EAX,WORD PTR DS:[EAX]

0041097F |C1E0 02 SHL EAX,2

00410982 |0385 39334000 ADD EAX,DWORD PTR SS:[EBP+403339]

00410988 |8B00 MOV EAX,DWORD PTR DS:[EAX]

0041098A |0385 31334000 ADD EAX,DWORD PTR SS:[EBP+403331] ; 把API地址转换成VA

00410990 |EB 10 JMP SHORT 004109A2

004109A2 8BBD 25334000 MOV EDI,DWORD PTR SS:[EBP+403325]

004109A8 3BC7 CMP EAX,EDI ; EAX就是取出的API了

004109AA 76 35 JBE SHORT 004109E1 ; 这里要跳了，要不然，壳还要"照顾"的

这里改成:

004109AA /EB 35 JMP SHORT 004109E1

……..

004109E3 90 NOP

004109E4 894424 1C MOV DWORD PTR SS:[ESP+1C],EAX ; 这里又我们通过跟踪知道改成mov ss:[edx],eax就是传入正确的API

所以这里改成:

004109E4 36:8902 MOV DWORD PTR SS:[EDX],EAX

004109E7 90 NOP

004109E8 61 POPAD

004109E9 FF0424 INC DWORD PTR SS:[ESP] ; 把上面要返回的地址+1(410FDF)

004109EC 0BC0 OR EAX,EAX

……

00411085 90 NOP

00411086 E8 ECF6FFFF CALL 00410777

0041108B 0BE4 OR ESP,ESP

0041108D 90 NOP

0041108E 90 NOP

0041108F 90 NOP

0041109C E8 51F9FFFF CALL 004109F2 ; 这里进去将再改填充API

004110A1 90 NOP

跟进看看:

……

00410A0B 90 NOP

00410A0C BF 96844000 MOV EDI,00408496 ; 传入Address

00410A11 EB 01 JMP SHORT 00410A14

00410A13 90 NOP

00410A14 B9 86010000 MOV ECX,186 ; 传入size

…….

00410A29 90 NOP

00410A2A 3917 CMP DWORD PTR DS:[EDI],EDX

00410A2C 74 0D JE SHORT 00410A3B

00410A2E 47 INC EDI

00410A2F EB 01 JMP SHORT 00410A32

00410A31 90 NOP

00410A32 ^ E2 F6 LOOPD SHORT 00410A2A

00410A34 EB 01 JMP SHORT 00410A37

00410A36 90 NOP

00410A37 8902 MOV DWORD PTR DS:[EDX],EAX ; 这里又想破坏输入表,也nop掉

00410A39 EB 4E JMP SHORT 00410A89

00410A3B 90 NOP

……

00410A5A 90 NOP

00410A5B 807F FF EA CMP BYTE PTR DS:[EDI-1],0EA

00410A5F ^ 75 D6 JNZ SHORT 00410A37

00410A61 90 NOP ; 这里要改成这样子,传入FF25

00410A62 90 NOP

00410A63 90 NOP

00410A64 90 NOP

00410A65 90 NOP ; 因为加壳的时候壳把FF25改成了FFEA

00410A66 90 NOP

00410A67 90 NOP

00410A68 90 NOP

00410A69 90 NOP

00410A6A FE4F FF DEC BYTE PTR DS:[EDI-1] ; 这里开始nop掉

00410A6D 83C7 04 ADD EDI,4

00410A70 2BC7 SUB EAX,EDI

00410A72 8947 FC MOV DWORD PTR DS:[EDI-4],EAX

00410A75 EB 12 JMP SHORT 00410A89

改好后:

00410A5A 90 NOP

00410A5B 807F FF EA CMP BYTE PTR DS:[EDI-1],0EA

00410A5F ^ 75 D6 JNZ SHORT 00410A37

00410A61 66:C747 FE FF25 MOV WORD PTR DS:[EDI-2],25FF ; 这里要改成这样子,传入FF25

00410A67 90 NOP

00410A68 90 NOP

00410A69 90 NOP

00410A6A 90 NOP ; 这里开始nop掉

00410A6B 90 NOP

00410A6C 90 NOP

00410A6D 90 NOP

00410A6E 90 NOP

00410A6F 90 NOP

00410A70 90 NOP

00410A71 90 NOP

00410A72 90 NOP

00410A73 90 NOP

00410A74 90 NOP

00410A75 EB 12 JMP SHORT 00410A89

……

00410A83 90 NOP

00410A84 8907 MOV DWORD PTR DS:[EDI],EAX ; 这里也是破坏输入表的，清除之

00410A86 EB 01 JMP SHORT 00410A89

好了，输入表处理完毕，进入下一个环节，还原壳所抽的代码.

……

0041114B 90 NOP

0041114C 90 NOP

0041114D F3: PREFIX REP: ; 通过RDTSC检测反跟踪，这是最后一个反跟踪了

0041114E 0F31 RDTSC

00411150 50 PUSH EAX

00411151 F3: PREFIX REP: ; Superfluous prefix

00411152 0F31 RDTSC

00411154 EB 01 JMP SHORT 00411157

00411156 90 NOP

……

00411191 8D6424 04 LEA ESP,DWORD PTR SS:[ESP+4]

00411195 FF6424 FC JMP DWORD PTR SS:[ESP-4] ; 如果没发现就去正常执行程序处

00411199 90 NOP

0041119A 2200 AND AL,BYTE PTR DS:[EAX]

0041119C 0000 ADD BYTE PTR DS:[EAX],AL

0041119E 85C0 TEST EAX,EAX

004111A0 75 1F JNZ SHORT 004111C1

004111A2 74 34 JE SHORT 004111D8

004111A4 F8 CLC

004111A5 83C9 FF OR ECX,FFFFFFFF ; 发现的话到这里就挂

004111A8 F3:AB REP STOS DWORD PTR ES:[EDI]

004111AA E8 1C000000 CALL 004111CB

……

004111CE 90 NOP

004111CF 90 NOP

004111D0 B8 7B4D5F0E MOV EAX,0E5F4D7B ; 如果没有发现跟踪的话就跳到这里

004111D5 90 NOP

……

004111FB /74 45 JE SHORT 00411242

004111FD |BE F4244100 MOV ESI,004124F4

00411202 |B9 5C020000 MOV ECX,25C ; 传入SIZE也就是壳所抽的代码的大小

00411207 |51 PUSH ECX

00411208 |B0 3C MOV AL,3C

0041120A |304431 FF XOR BYTE PTR DS:[ECX+ESI-1],AL ; 还原壳所抽的代码,这个不是程序的入口那一点哦

0041120E |90 NOP

0041120F |90 NOP

00411210 |90 NOP

00411211 |90 NOP

00411212 |90 NOP

00411213 |90 NOP

00411214 |90 NOP

00411215 |90 NOP

00411216 |90 NOP

00411217 |90 NOP

00411218 |90 NOP

00411219 |90 NOP

0041121A |004C31 FF ADD BYTE PTR DS:[ECX+ESI-1],CL

0041121E ^|E2 EA LOOPD SHORT 0041120A

……

00411231 90 NOP

00411232 BF C8014000 MOV EDI,004001C8 ; 这里处理壳所抽的代码,俺是在这里动的手脚,具体怎么改我就不讲，以免卖弄之嫌(看看我已经脱好的就怎么怎么改的).

00411237 90 NOP

00411238 90 NOP

00411239 90 NOP

0041123A 90 NOP

0041123B 90 NOP

0041123C 90 NOP

0041123D 90 NOP

0041123E 90 NOP

0041123F 90 NOP

00411240 F3:A4 REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[>; 把代码放到PE HEADER部分，够狠

……

00411279 61 POPAD ; 解压完毕，执行程序代码

0041127A BA 0F5C8CCE MOV EDX,CE8C5C0F ; 终于着陆了;-)

0041127F EB 01 JMP SHORT 00411282

00411281 90 NOP

00411282 81F2 753DE58A XOR EDX,8AE53D75

看看程序里面的东西,哈哈，抽的不错嘛，于是乎，动手乱写一下修复脚本.

……

var addr

var addrl

var addrt

var addrt1

var addr40

var addrt2

start:

mov addr,4101c6 //写的比较乱，但愿你能看懂:-)

lbl1: //修复代码一

cmp addr,410430

jae lbl2

find addr,#E9#

mov addr,$RESULT

mov addrt,addr

mov addrt1,addr

mov addr40,addr

sub addr40,10000

add addr40,5

dec addrt

inc addrt1

mov addrt1,[addrt1]

add addr40,addrt1

mov addrl,addr40

add addrt,5

sub addrt,addrl

mov addrt2,FFFFFFFF

sub addrt2,addrt

inc addr

mov [addr],addrt2

jmp lbl1

lbl2: //修复代码二

repl 401000,#E8??81FFFF#,#E8??810000#,8b24

repl 401000,#E9??81FFFF#,#E9??810000#,8b24

repl 401000,#E8??82FFFF#,#E8??820000#,8b24

repl 401000,#E9??82FFFF#,#E9??820000#,8b24

repl 401000,#E8??83FFFF#,#E8??830000#,8b24

repl 401000,#E9??83FFFF#,#E9??830000#,8b24

ret

好了，现在到了最后一步了，把jmp表全部下一个地址，也就是这样子.

00408495 90 NOP

00408496 $- FF25 88A04000 JMP DWORD PTR DS:[<&kernel32.CloseHandle>; kernel32.CloseHandle

0040849C $- FF25 78A04000 JMP DWORD PTR DS:[<&kernel32.CopyFileA>] ; kernel32.CopyFileA

好了，现在dump再用import REC修复一下输入表就行了。至于stolencode可以找也可以不用，这么简单的几行，我自己就不再补上去(要补也简单，看一眼就知道怎么改).

OK，壳到此脱完了，谢谢你能够坚持把文章看完!

BTW:自己脱了后，看了一下FLY的已脱程序，感触很深的，他真是头大牛来的!努力向他学习才行.

因时间比较紧，发了几天的时间才写完了这篇文章.文章不足之处还请指正.

Greetz:

Fly,Jingulong,yock,tDasm,David,ahao,vcasm,UFO(brother),alan(sister),heXpe,hexer, all of my friends and you!

Welcome to:

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http://www.chinadfcg.com

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http://www.fcgchina.com

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By loveboom[DFCG][FCG]

Email:bmd2chen#tom.com