这个壳相对来说还是很温和
没有ANTI-DEBUG没有破坏输入表简要说
下开始有很多SMC来还原
代码很简单但比较长就不多说了遇到LOOP就G到它下面句只要有耐心通过他并不困难然后走到读密匙盘地方如下:0167:004E7C37 MOV BYTE [EBP+00433DE9],00
0167:004E7C3E MOV AL,01
0167:004E7C40 MOV DL,[EBP+00433DE9]
0167:004E7C46 CALL 004E78B5
0167:004E7C4B MOV AL,02
0167:004E7C4D MOV DL,[EBP+00433DE9]
0167:004E7C53 CALL 004E78B5
0167:004E7C58 MOV AX,0401
0167:004E7C5C MOV CX,4F01
0167:004E7C60 MOV DH,01
0167:004E7C62 MOV DL,[EBP+00433DE9]
0167:004E7C68 CALL 004E7925
0167:004E7C6D MOV AX,0201
0167:004E7C71 MOV CX,4F32
0167:004E7C75 MOV DH,01
0167:004E7C77 MOV DL,[EBP+00433DE9]
0167:004E7C7D CALL 004E7925
0167:004E7C82 MOV DL,[EBP+00433DE9]
0167:004E7C88 CALL 004E78FD
0167:004E7C8D MOV DL,[EBP+00433DE9]
0167:004E7C93 CALL 004E78FD
0167:004E7C98 MOV EBX,[EBP+00433DD7]
0167:004E7C9E CMP EBX,[EBP+00433DBF]
0167:004E7CA4 JZ 004E7CB7 <----注意这个强迫跳
0167:004E7CA6 CMP BYTE [EBP+00433DE9],01
0167:004E7CAD JNC 004E7CCE
0167:004E7CAF INC BYTE [EBP+00433DE9]
0167:004E7CB5 JMP SHORT 004E7C3E
0167:004E7CB7 PUSH EAX
0167:004E7CB8 LEA EDI,[EBP+00433BD7]
0167:004E7CBE LEA ECX,[EBP+00433CCA]
0167:004E7CC4 SUB ECX,EDI
0167:004E7CC6 DEC ECX
0167:004E7CC7 CLD
0167:004E7CC8 XOR AL,AL
0167:004E7CCA REP STOSB
0167:004E7CCC POP EAX
0167:004E7CCD RET 上面强迫跳转后就不会要求密匙盘了再往下还有些还原代码最后到如下:0167:004E7118 MOV EAX,004300A6
0167:004E711D ADD EAX,EBP
0167:004E711F SUB EAX,[EBP+00433DBB]
0167:004E7125 PUSH EAX
0167:004E7126 LEA EDI,[EBP+00430000]
0167:004E712C LEA ECX,[EBP+00433138]
0167:004E7132 SUB ECX,EDI
0167:004E7134 DEC ECX
0167:004E7135 CLD
0167:004E7136 XOR AL,AL
0167:004E7138 REP STOSB
0167:004E713A POP EAX
0167:004E713B PUSH EAX
0167:004E713C LEA EDI,[EBP+004332D3]
0167:004E7142 LEA ECX,[EBP+00434000]
0167:004E7148 SUB ECX,EDI
0167:004E714A DEC ECX
0167:004E714B CLD
0167:004E714C XOR AL,AL
0167:004E714E REP STOSB
0167:004E7150 POP EAX
0167:004E7151 MOV BYTE [EBP+00433DE8],00
0167:004E7158 POP EBP
0167:004E7159 JMP EAX <----到原入口 原入口可能需要密盘数据来还原没有密盘所以得到入口是不正确再运行会非法操作可以这样在最后那句把DUMP下来反汇编看里面
比如:GetCommandLineA、GetVersion这些般都出现在入口处找下找到如下::0042DED7 55 push ebp
:0042DED8 8BEC mov ebp, esp
:0042DEDA 6AFF push FFFFFFFF
:0042DEDC 68D0754600 push 004675D0
:0042DEE1 6810224300 push 00432210
:0042DEE6 64A100000000 mov eax, dword ptr fs:[00000000]
:0042DEEC 50 push eax
:0042DEED 64892500000000 mov dword ptr fs:[00000000], esp
:0042DEF4 83EC58 sub esp, 00000058
:0042DEF7 53 push ebx
:0042DEF8 56 push esi
:0042DEF9 57 push edi
:0042DEFA 8965E8 mov dword ptr [ebp-18], esp
* Reference To: KERNEL32.GetVersion, Ord:0174h
|
:0042DEFD FF1570034600 Call dword ptr [00460370]
:0042DF03 33D2 xor edx, edx
:0042DF05 8AD4 mov dl, ah
:0042DF07 8915945A4800 mov dword ptr [00485A94], edx
:0042DF0D 8BC8 mov ecx, eax
:0042DF0F 81E1FF000000 and ecx, 000000FF
:0042DF15 890D905A4800 mov dword ptr [00485A90], ecx
:0042DF1B C1E108 shl ecx, 08
:0042DF1E 03CA add ecx, edx
:0042DF20 890D8C5A4800 mov dword ptr [00485A8C], ecx
:0042DF26 C1E810 shr eax, 10
:0042DF29 A3885A4800 mov dword ptr [00485A88], eax
:0042DF2E 6A01 push 00000001
:0042DF30 E862560000 call 00433597
:0042DF35 59 pop ecx
:0042DF36 85C0 test eax, eax
:0042DF38 7508 jne 0042DF42
:0042DF3A 6A1C push 0000001C
:0042DF3C E8C3000000 call 0042E004
:0042DF41 59 pop ecx
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0042DF38(C)
|
:0042DF42 E8A5330000 call 004312EC
:0042DF47 85C0 test eax, eax
:0042DF49 7508 jne 0042DF53
:0042DF4B 6A10 push 00000010
:0042DF4D E8B2000000 call 0042E004
:0042DF52 59 pop ecx
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0042DF49(C)
|
:0042DF53 33F6 xor esi, esi
:0042DF55 8975FC mov dword ptr [ebp-04], esi
:0042DF58 E8C13E0000 call 00431E1E
* Reference To: KERNEL32.GetCommandLineA, Ord:00CAh
|
:0042DF5D FF15F8014600 Call dword ptr [004601F8]
:0042DF63 A3C8714800 mov dword ptr [004871C8], eax
:0042DF68 E8F8540000 call 00433465
:0042DF6D A3D05A4800 mov dword ptr [00485AD0], eax
:0042DF72 E8A1520000 call 00433218
:0042DF77 E8E3510000 call 0043315F
:0042DF7C E8E5EEFFFF call 0042CE66
:0042DF81 8975D0 mov dword ptr [ebp-30], esi
:0042DF84 8D45A4 lea eax, dword ptr [ebp-5C]
:0042DF87 50 push eax 所以估计42DED7就是真正入口试下果然正确
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