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#4
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Hi,
I'm having trouble with imports too :/ I've been trying to unpack certain app for whole day now. I got dump, eop, i think stolen bytes are good but program crashes. Tracing through exe that crashes i noticed that i didnt resolve one (for now) import correctly. Now i attempt to resolve it correctly by debugging packed app. I run packed app, break on place where this function is called and trace into it. It was very weird. Seems that whole function is in packer code. It never jumps/calls real dll. Btw this is kernel32 function. When function is executed only eax changes and before function executes eax is address inside code section (something like 4xxxxx). BUT result doesnt seem to be parameter dependent. Here is some code (this is some really obfuscated shit): Code:
00C69B75 9C PUSHFD 00C69B76 55 PUSH EBP 00C69B77 E8 00000000 CALL 00C69B7C 00C69B7C 5D POP EBP 00C69B7D 81ED 7C9B0100 SUB EBP,19B7C 00C69B83 50 PUSH EAX 00C69B84 60 PUSHAD 00C69B85 8BEC MOV EBP,ESP 00C69B87 55 PUSH EBP 00C69B88 29F6 SUB ESI,ESI 00C69B8A 0FBDF6 BSR ESI,ESI 00C69B8D B9 6E990020 MOV ECX,2000996E 00C69B92 31D2 XOR EDX,EDX 00C69B94 D1C1 ROL ECX,1 00C69B96 29DB SUB EBX,EBX 00C69B98 D1CE ROR ESI,1 00C69B9A 29C0 SUB EAX,EAX 00C69B9C 29C3 SUB EBX,EAX 00C69B9E 81EB 9942F43E SUB EBX,3EF44299 00C69BA4 C1C3 03 ROL EBX,3 . . . Code:
00C69BF3 89E1 MOV ECX,ESP 00C69BF5 81F0 FFFFA262 XOR EAX,62A2FFFF 00C69BFB 01C8 ADD EAX,ECX 00C69BFD 39F3 CMP EBX,ESI 00C69BFF 7E 01 JLE SHORT 00C69C02 00C69C01 F7DB NEG EBX 00C69C03 FFD0 CALL EAX Code:
0012FEC4 8BE5 MOV ESP,EBP 0012FEC6 61 POPAD 0012FEC7 58 POP EAX 0012FEC8 8B85 87AB0100 MOV EAX,DWORD PTR SS:[EBP+1AB87] 0012FECE 5D POP EBP 0012FECF 9D POPFD 0012FED0 C3 RETN |
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