GoldSprinter

Type : Game - http://www.alawar.com
Protection : ASProtect
Tech : Dumping + IAT Fix

Crack : Some times unexpected things happens.Verifying the IAT with the IMPRec of this program shows that 2 Thunks have invalid pointers.Trace Level 1-2-3 can be used on some.But still there are some invalid pointers.

These invalid pointers are nothing but ASProtect CALLS which then CALLS corresponding APIs.Just fooling us.

I have seen that if we just go inside any EMULATED API call routine by pressing F8 ... it helps ImpRec to build IAT ...It happend while unpacking this program.
So just trace through CALL at 00439376 code till you enter any API in system dll.
And now use ImpRec.We can see all APIs get validatded. Why is it behaving like this ????
Is it like giving a hint to ImpRec ????

Finding OEP

IceDump can be used to find OEP.Use /tracex 400000 eip-8.But here it can be found out easily.In SICE BPX GETVERSION.Now run packed program.When we break.Look up to see real entry point ...

015F:004392AD 55 PUSH EBP --->>> OEP
015F:004392AE 8BEC MOV EBP,ESP
015F:004392B0 6AFF PUSH FF
015F:004392B2 6878354500 PUSH 00453578
015F:004392B7 68587B4300 PUSH 00437B58
015F:004392BC 64A100000000 MOV EAX,FS:[00000000]
015F:004392C2 50 PUSH EAX
015F:004392C3 64892500000000 MOV FS:[00000000],ESP
015F:004392CA 83EC58 SUB ESP,58
015F:004392CD 53 PUSH EBX
015F:004392CE 56 PUSH ESI
015F:004392CF 57 PUSH EDI

Dumping can be done even after first api call ...it will work. Use JMP EIP = EB FE trick to dump file.Use WinHex and correct EB FE.Now use PEditor and change EP.

Use WinHex RAM Editor -- Open Primary Memory of program.Just note the address of API GetVersion and go to that address....we can see...

IAT : 00453000 -- 0045323F --> 240 --- Like Packets of address

Use ImpRec
OEP = 392AD
RVA = 53000
SIZE = 240

Click " GetImports" ... "Auto Trace" Fix Dump

Run program ... we get page fault at : 017FC784
----------------------------------------------------------------------
Trace from begining ...

015F:00439375 50 PUSH EAX
015F:00439376 E87589FEFF CALL 00421CF0 -- >>
015F:0043937B 8945A0 MOV [EBP-60],EAX
015F:0043937E 50 PUSH EAX

Inside CALL 00421CF0 ....

015F:00421CF0 8B442404 MOV EAX,[ESP+04]
015F:00421CF4 83EC1C SUB ESP,1C
015F:00421CF7 A370DB4700 MOV [0047DB70],EAX
015F:00421CFC FF1530654600 CALL [00466530] --- Page Fault : NaG Wnd
015F:00421D02 A14C144800 MOV EAX,[0048144C]
015F:00421D07 85C0 TEST EAX,EAX
015F:00421D09 0F8487000000 JZ 00421D96 --- BAD BOY
015F:00421D0F 8B4C242C MOV ECX,[ESP+2C]
015F:00421D13 51 PUSH ECX
015F:00421D14 E887000000 CALL 00421DA0
015F:00421D19 83C404 ADD ESP,04
015F:00421D1C 85C0 TEST EAX,EAX
015F:00421D1E 7576 JNZ 00421D96
015F:00421D20 53 PUSH EBX
015F:00421D21 8B1DF0314500 MOV EBX,[USER32!TranslateMessage]
015F:00421D27 55 PUSH EBP

Compare with Packed Program : we can see ... CALL 00421C80 ---> NAG Wnd
So [00466530] = 00421C80
Open dumped file with WinHex and go to offset : 66530
we can see : 84 C7 7F 01 = 017FC784 --- PAGE FAULT ADDRESS
Change this to : 80 1C 42 00 = 00421C80
Now our dumped file runs ..... IAT rebuilding trick still remains a mestry for me how ImpRec found out correct APIs.May be i have used TRACE level and then restarted the program.May be steping inside one of the API gave it some hint ... any way this shit is working ..

Now here is a API CALL in ASProtect :

API CALL in ASProtect

015F:00421CF7 A370DB4700 MOV [0047DB70],EAX
015F:00421CFC FF1530654600 CALL [00466530] ---> JMP TO 017FC784

015F:017FC784 833DA835800100 CMP DWORD PTR [018035A8],00
015F:017FC78B 7406 JZ 017FC793
015F:017FC78D FF15A8358001 CALL [018035A8] ---> JMP TO 00421C80
015F:017FC793 C3 RET

015F:00421C80 A144144800 MOV EAX,[00481444]
015F:00421C85 50 PUSH EAX
015F:00421C86 FF1580304500 CALL [00453080] --> JMP TO 01812E90

015F:01812E90 E9B1317BBE JMP BFFC6046 (JUMP)

015F:BFFC6041 E92D13FBFF JMP KERNEL32!lstrcat

Inside Win32 API -----------------------------------------------------

015F:BFF7FFE4 C20400 RET 0004 
KERNEL32!VirtualAlloc 
015F:BFF7FFE7 55 PUSH EBP --- Here !!!
015F:BFF7FFE8 8BEC MOV EBP,ESP
015F:BFF7FFEA 83EC08 SUB ESP,08
015F:BFF7FFED 817D0C0000C07F CMP DWORD PTR [EBP+0C],7FC00000
015F:BFF7FFF4 53 PUSH EBX
015F:BFF7FFF5 56 PUSH ESI
015F:BFF7FFF6 57 PUSH EDI
015F:BFF7FFF7 760C JBE BFF80005

This means : CALL [00CE78E8] ---> CALL KERNEL32!VirtualAlloc

We can use IAT editor in ImpRec to fill this API ...But any way i got full version of FlashMX from warez .... who cares about this silly demo ...

EAX=601105B3 ; [EBP-70] = SS:0058B30C=B5F3

UnPacking :

BPMB #0030:00C3D79C W DR3

FCShare.text1

015F:600BD511 50 PUSH EAX
015F:600BD512 8B47F8 MOV EAX,[EDI-08]
015F:600BD515 0345FC ADD EAX,[EBP-04]
015F:600BD518 50 PUSH EAX
015F:600BD519 E8D20B0000 CALL 600BE0F0 <--- Unpack
015F:600BD51E 83C728 ADD EDI,28
015F:600BD521 83C40C ADD ESP,0C
015F:600BD524 8D47EC LEA EAX,[EDI-14]
015F:600BD527 3BC3 CMP EAX,EBX
015F:600BD529 72DE JB 600BD509
015F:600BD52B 8B7DFC MOV EDI,[EBP-04]
015F:600BD52E 3B7DF4 CMP EDI,[EBP-0C]
015F:600BD531 7423 JZ 600BD556 <--- Loop
015F:600BD533 8B86A0000000 MOV EAX,[ESI+000000A0]
015F:600BD539 FFB6A4000000 PUSH DWORD PTR [ESI+000000A4]
015F:600BD53F 03C7 ADD EAX,EDI
015F:600BD541 50 PUSH EAX
015F:600BD542 FF75F4 PUSH DWORD PTR [EBP-0C]
015F:600BD545 57 PUSH EDI
015F:600BD546 E8D8000000 CALL 600BD623
015F:600BD54B 83C410 ADD ESP,10
015F:600BD54E 84C0 TEST AL,AL
015F:600BD550 0F84C9000000 JZ 600BD61F ---> Extraction Error
015F:600BD556 FFB680000000 PUSH DWORD PTR [ESI+00000080]
015F:600BD55C 57 PUSH EDI
015F:600BD55D E852010000 CALL 600BD6B4
015F:600BD562 59 POP ECX
015F:600BD563 84C0 TEST AL,AL
015F:600BD565 59 POP ECX
015F:600BD566 0F84B3000000 JZ 600BD61F ---> Extraction Error
015F:600BD56C 8D86F8000000 LEA EAX,[ESI+000000F8]

Quickly restoring the patch in memory avoids page fault.
So each section act as an decryption key.

Patch :

Write String "Asshole" at end of file FCShare.dll and run it ... we can
see that there is no page fault.So that part is not part of key.

File offset : 46F60
In memory :

015F:6011CF60 41 73 73 68 6F 6C 65 00-00 00 00 00 00 00 00 00 Asshole.........
015F:6011CF70 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................

So we will use this place to write our code.

Winnt.h

#define PAGE_NOACCESS 0x01
#define PAGE_READONLY 0x02
#define PAGE_READWRITE 0x04
#define PAGE_WRITECOPY 0x08
#define PAGE_EXECUTE 0x10
#define PAGE_EXECUTE_READ 0x20
#define PAGE_EXECUTE_READWRITE 0x40
#define PAGE_EXECUTE_WRITECOPY 0x80
#define PAGE_GUARD 0x100
#define PAGE_NOCACHE 0x200
#define PAGE_WRITECOMBINE 0x400

Text1.Section
Flag : 60000020 -- Contains executable code + readable
Offset : 2DF

The section we where looking to patch have only Execute and Readonly permission.So we can't use runtime patching directly [ we will end up in page fault ].But there are loop holes ... If we can use some api with Ring0 prvg we can bypass this protection.

How To Patch This Baby :

What we are going to do is to change OEP to 6011CF40 using hex editor and quickly restore its OEP in memory so that Armadillo will think every thing is OKand do our stuff and then jump to real OEP

015F:6011CF40 60 PUSHAD -- NEW EP
015F:6011CF41 33FF XOR EDI,EDI
015F:6011CF43 E8EE79E65F CALL KERNEL32!GetCurrentProcessId
015F:6011CF48 50 PUSH EAX
015F:6011CF49 57 PUSH EDI
015F:6011CF4A 6A38 PUSH 38
015F:6011CF4C E8FC8CE75F CALL KERNEL32!OpenProcess
015F:6011CF51 8BF0 MOV ESI,EAX ---> Let us restore OEP in memory
015F:6011CF53 B804000000 MOV EAX,00000004 <-- Count
015F:6011CF58 B930CF1160 MOV ECX,6011CF30 <-- Buffer:Data To Write "40ED0300"
015F:6011CF5D BA48010860 MOV EDX,60080148 <-- Addr To Write
015F:6011CF62 6A00 PUSH 00
015F:6011CF64 50 PUSH EAX
015F:6011CF65 51 PUSH ECX
015F:6011CF66 52 PUSH EDX
015F:6011CF67 56 PUSH ESI
015F:6011CF68 E8687AE75F CALL KERNEL32!WriteProcessMemory --- Write orginal OEP
015F:6011CF6D 90 NOP -----> ===== Start Hook Routine =====
015F:6011CF6E A1C0C00C60 MOV EAX,[KERNEL32!VirtualProtect]
015F:6011CF73 A394120D60 MOV [600D1294],EAX
015F:6011CF78 C705C0C00C6090CF1160MOV DWORD PTR [600CC0C0],6011CF90
015F:6011CF82 61 POPAD
015F:6011CF83 E9B81DFAFF JMP 600BED40 -- JMP TO OEP
015F:6011CF88 0000 ADD [EAX],AL
015F:6011CF8A 0000 ADD [EAX],AL
015F:6011CF8C 0000 ADD [EAX],AL
015F:6011CF8E 0000 ADD [EAX],AL == Hook Function ===
015F:6011CF90 66C78090C70000EB28 MOV WORD PTR [EAX+0000C790],28EB -- Patch
015F:6011CF99 A194120D60 MOV EAX,[KERNEL32!VirtualProtect]
015F:6011CF9E A3C0C00C60 MOV [600CC0C0],EAX -- Restore API Address
015F:6011CFA3 B820000000 MOV EAX,00000020
015F:6011CFA8 6890120D60 PUSH 600D1290 <-- Buffer
015F:6011CFAD 6A00 PUSH 00
015F:6011CFAF 6A00 PUSH 00
015F:6011CFB1 6800CE1160 PUSH 6011CE00 <-- THread Func
015F:6011CFB6 6A00 PUSH 00
015F:6011CFB8 6A00 PUSH 00 -- Create a Thread to Patch after Some time
015F:6011CFBA E8AB9FE55F CALL KERNEL32!CreateThread
015F:6011CFBF C3 RET

At line 6011CF90 --- EAX=00C31000
Eax + C790 = 00C3D790

Thread Function :

015F:6011CE00 C60584D20A6045 MOV BYTE PTR [600AD284],45
015F:6011CE07 6A00 PUSH 00
015F:6011CE09 E8D1D0E65F CALL KERNEL32!ExitThread

It is seen that while we reach here data is ready to patch

Note : I get a PAge Fault while closing IE ? But program is working in registered mode..

Special Note to Armadillo programers : You $%#$%^! ,you have no right
to control my PC ... which is my private property.Kick Ass $%^$#%!

http://kickme.to/mxbnet
dheeraj_xp@yahoo.com