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WinAmp Skin Maker 1.05

Type : Make cool skins for WinAmp
Protection : Serial
Tech : Serial fishing


Crack : Enter fake S/N and your name ...in SICE BPX GETDLGITEMTEXTA
Trace......

0x40A17B CMP EDI,EBX => EDI = FAKE S/N IN HEX;EBX = REAL S/N IN HEX
0x40A17D JNZ 40A1B4

Registration Info :

Name = DHEERAJ
S/N = 6668369

> Registry Key.Some how I managed to write false key in to Registry by playing inside its
reg-algorithm.Then restared program .... WinAce showed a message box telling "Your key has expired".
This will be our attack point.
In SICE BPX MESSAGEBOXA

Trace Back ....we will reach here ...

0x5BAA3A CALL 403F6C
0x5BAA3F CMP DW PTR [5DCCF8],00
0x5BAA46 SETNZ AL | 0F 95 C0
0x5BAA49 AND EAX,7F
0x5BAA4C MOV [5DCDF4],EAX >> MAKE EAX = 01 [ SAVE FLAG ]

To crack : 0x5BAA46 SETZ AL | 0F 94 C0

As this file is packed we will have to use run time patching ....

Find the real entry point of the program.Use SICE Symbol loader.[Make sure
you have changed flag of .CODE section to E0000020 ]

0x6BA4F1 POPAD
0x6BA4F2 JNZ 6BA4FC
..............................
0x6BA4FC PUSH 5D6A44 >> OEP
0x6BA501 RET >> IMPLEMENT THE PATCH HERE .

ie ...

0x6BA501 MOV BYTE PTR [5BAA47],94 | C6 05 47 AA 5B 00 94
0x6BA508 RET | C3

AV part is not cracked :(
*The AV signature feature can not be tested, since it requires a valid personal
registration key to work correctly.

Patch :

File = winace.exe
Offset = C5F01

Write : C6 05 47 AA 5B 00 94 C3


! To Crack

Flag Set : [To Find Root]

BPMB 004D5F74 W -->

015F:004CA9C5 E85210F5FF CALL 0041BA1C
015F:004CA9CA A1D8F14C00 MOV EAX,[004CF1D8]
015F:004CA9CF C60000 MOV BYTE PTR [EAX],00 <--- Here

Loader : Make a loader which will do this .....

015F:004CA9CF C60001 MOV BYTE PTR [EAX],01

Update : [Unpacking the Program]
IAT fixed by ImpRec 1.3 gave stack problems ...But when i used ImpRec 1.42 it worked.
Let us unpack this baby ...

BPX SHOWWINDOW

015F:00408048 FF25C8955200 JMP [005295C8]
--->
015F:00F50FF0 689820F5BF PUSH USER32!ShowWindow
015F:00F50FF5 C3 RET

So IAT packets at 005295C8
Use WinHex -- RAM Editor --- Open Process memory --- Go to 005295C8
IAT Starts From : 00529190 --> To --> 0052992F = 79F + 1 = 7A0


Use ImpRec 1.4.2 [ImpRec 1.3 Didn't worked well?]
RVA = 129190
Size = 7A0

Select "GetImports" --> "ShowInvalid" --> "Auto Trace"

By this way all API get validated.

Load IceDump [Great Tool!] and in SICE ...put
BPX GetVolumeInformationA
Now run VZPR 5.4 .. soon we will break in ASProtect Code ..
Now remove BPX and use .... tracex command ..
/tracex 400000 eip-8
We can see we break in ASProtect module ... type this command till
we break in main program module ... [After you are in main program
module never give this command it will give you page fault!]

We will break here ...

015F:00491D30 55 PUSH EBP <--- Not OEP -- No Don't Dump Here
015F:00491D31 8BEC MOV EBP,ESP
015F:00491D33 B8785F4D00 MOV EAX,004D5F78
015F:00491D38 8B5508 MOV EDX,[EBP+08]
015F:00491D3B E8CC2BF7FF CALL 0040490C
015F:00491D40 5D POP EBP
015F:00491D41 C20400 RET 0004 --> Return to ASProtect

Now use "F10" and return to ASProtect code...
Now use tracex command ... we can see code like these just follow above
step ... and wait till you reach here ... [Long wait]

015F:004CC8A8 55 PUSH EBP <-- Real OEP --- Dump It --- JMP EIP TRICK
015F:004CC8A9 8BEC MOV EBP,ESP
015F:004CC8AB 83C4F4 ADD ESP,-0C
015F:004CC8AE 53 PUSH EBX
015F:004CC8AF B870C54C00 MOV EAX,004CC570
015F:004CC8B4 E853ACF3FF CALL 0040750C
015F:004CC8B9 8B1DBCF14C00 MOV EBX,[004CF1BC]
015F:004CC8BF 8B03 MOV EAX,[EBX]
015F:004CC8C1 E8320CF9FF CALL 0045D4F8
015F:004CC8C6 8B0DACF34C00 MOV ECX,[004CF3AC]
015F:004CC8CC 8B03 MOV EAX,[EBX]
015F:004CC8CE 8B15D42F4C00 MOV EDX,[004C2FD4]
015F:004CC8D4 E83F0CF9FF CALL 0045D518
015F:004CC8D9 8B0DE0F04C00 MOV ECX,[004CF0E0]

Now 4CC8A8 is our real OEP ... Dump it with JMP EIP trick [EB FE]
Use WinHex and correct EB FE --> 55 8B ..Now use PEdit and make
EP = CC8A8

Now load tree file and fix the Dump using ImpRec 1.42 [OEP = CC8A8]

Luckly ImpRec 1.42 has done the job ... it is totaly unpacked.

Patch :
015F:004CA9CF C60001 MOV BYTE PTR [EAX],01 OFFSET = CA9CF

 


0C0D4 X
Trace Back.We can find all API and from where it is called ...But realy boring and some APIs are never called in normal working .... you will have to do all sort of thing with this baby to make that API call so that we can find from where it is called.

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 ...


PTR [EBP-70],B5F3
015F:00C400F0 C745FC01000000 MOV DWORD PTR [EBP-04],00000001
015F:00C400F7 B900000000 MOV ECX,00000000
015F:00C400FC 668CC9 MOV CX,CS
015F:00C400FF 32C9 XOR CL,CL
015F:00C40101 E361 JECXZ 00C40164
015F:00C40103 B443 MOV AH,43
015F:00C40105 CD68 INT 68 <----
015F:00C40107 66338558FEFFFF XOR AX,[EBP-01A8]
015F:00C4010E 663B4590 CMP AX,[EBP-70]
015F:00C40112 7550 JNZ 00C40164

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

 

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