ASPR 1.2 question

[JMI]

gabri3l:

Have you downloaded R@dier's tut I mentioned and tried to follow his directions on rebuilding the IAT? There are many tuts on the net descussing rebuilding the IAT. There are also several good reference which discuss some of the routines ASPR renames. One can use the patterns of some of these routines to determine the name of the API. Here is one list, which is contributed by hobferret, over on the Woodmann Forum, and LaBBA. They give patterns of some which get moved or confused. Remember addresses are dependent on which OS you are using. Here's that list.

Aspr notes V1.4??

Redirected calls which cannot be auto resolved!

44B717 6513C4
6513C4 55 PUSH EBP
6513C5 8BEC MOV EBP,ESP
6513C7 5D POP ESP
6513C8 C20400 RET 04
Becomes Kernel32!FreeResource

44B724 65139C
65139C 6A00 PUSH 00
65139E E8B53DFFFF CALL Kernel32!GMHA
6513A3 FF35E46C6500 PUSH DWORD [00656CE4]
6513A9 58 POP EAX
6513AA 8B05F46C6500 MOV EAX, [00656CF4]
6513B0 C3 RET
Becomes Kernel32!GetCommandLineA

44B730 651388
651388 A1E86C6500 MOV EAX, [00656CE8]
65138D C3 RET
Becomes Kernel32!GetCurrentProcess

44B760 65133C
65133C Look it抯 GetModuleHandleA
Becomes Kernel32!GetModuleHandleA

44B770 650EE8
650EE8/F0E GetProcAddress
Becomes Kernel32!GetProcAddress

44B7A0 651358
651358 6A00 PUSH 00
65135A E8F93DFFFF CALL Kernel32!GMHA
65135F FF35E46C6500 PUSH DWORD [00656CE4]
651365 58 POP EAX
651366 C3 RET
Becomes Kernel32!GetCommandLineA

44B7D4 6513B4
6513B4 55 PUSH EBP
6513B5 8BEC MOV EBP,ESP
6513B7 8B05F46C6500 MOV EAX, [00656CF4]
6513BD B84508 MOV EAX, [EBP+08]
6513C0 5D POP EBP
6513C1 C20400 RET 04
Becomes Kernel32!LockResource

4753F8 - ED13D0
EDI3D0 6A00 PUSH 00
ED13D2 CALLKernel32!GMHA
ED13D7 FF35E86CED00 PUSH WORD [00ED6CE8]
ED13DD 58 POP EAX
ED13DE 8B05F86CED00 MOV EAX, [00ED6CF8]
ED13E4 C3 RET
Becomes Kernel32!GetCommandLineA

4573FC - ED13C0
ED13C0 55 PUSH EBP
ED13C1 8BEC MOV EBP,ESP
ED13C3 CALLKernel32!GetVersion
ED13C8 A1F46CED00 MOV EAX, [00ED6CF4]
ED13CD 5D POP EBP
ED13CE C3 RET
Becomes Kernel32!GetVersion

457444 - EE9E24
EE9E24 52 PUSH EDX
EE9E25 68369507C0 PUSH WORD [C0079536]
EE9E2A C3 RET
Becomes Kernel32!GlobalUnlock

475464 - ED13B8
ED13B8 A1EC6CED00 MOV EAX, [00ED6CEC]
ED13BD C3 RET
Becomes Kernel32!GetCurrentProcess

4754D0 - ED0EF0
ED0EF0\\ED0FI6
CALL Kernel32!GetProcAddress
RET 08
Becomes Kernel32!GetProcAddress

475518 - ED1360
ED1360\\ED1384
CALL Hernel32!GMHA
RET 04
Becomes Kernel32!GetModuleHandleA

LaBBa explanation!

PUSH EBP
MOV EBP,ESP
MOV EAX,[FF7E24] // DWORD VALUE 001522398
POP EBP
RETN4
EITHER LOCK RESOURCE or FREERESOURCE

PUSH DWORD PTR DS:[FF7E14]
POP EAX
RET
GET VERSION

PUSH EBP
MOV EBP,ESP
MOV EAX,DWORD PTR DS:[FF7E24]
MOV EAX,DWORD PTR SS:[EBP+8]
POP EBP
RETN4
EITHER LOCKRESOURCE or FREERESOURCE

MOV EAX,DWORD PTR DS:[FF7E20]
RETN
GETCURRENTPROCESSID

MOV EAX,DWORD PTR DS:[FF7E18]
RETN
GETCURRENTPROCESS - GETCURRENTPROCESSID works too!

PUSH EBP
MOV EBP,ESP
MOV EAX,DWORD PTR DS:[FF7E24]
POP EBP
RETN4
EITHER LOCKRESOURCE or FREERESOURCE

LaBBa's tut: ASPR 1.23 Unpacking "Step-By-Step" has methods of resolving APIs with Olly. One thing to remember is that it would be unusual to find an API from a different DLL among listings for a particular DLL. By that, I mean, you won't see user32.dll listings in the middle of kernel32.dll.

One recent thread here described the process in this sequence:

11) Loaded Imprec v1.6f
12) Selected DVDIdle Pro as Active Process
13) Pressed IAT Auto Search
14) Pressed Get Imports (left all values at default)
15) Pressed Show Invalid
16) Right clicked on invalid and selected: Trace Level 1 (disasm)
17) Pressed Show Invalid again
18) Right clicked on invalid and selected: Plugin Tracers-> aspr2

You can find the aspr2 tracer here:

http://www.exetools.com/forum/showthread.php?t=3594&page=2

If you post your target, I may have time to take a look to confirm your information.

Regards,