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Super easy crackme

 
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Fuzz
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Joined: 12 Nov 2006
Posts: 531
PostPosted: Wed Jul 23, 2008 4:20 pm    Post subject: Super easy crackme Reply with quote
this was a challenge on the IRC kinda...

On a 1-10 it should be a 1 or a 2.
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atom0s
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Joined: 25 Jan 2006
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Location: 127.0.0.1
PostPosted: Wed Jul 23, 2008 5:27 pm    Post subject: Reply with quote
Code:
0040194D  |. /75 17         JNZ SHORT Fuzz's_E.00401966


Patch the jump or reverse the call above it to obtain the password each time.

Condition is the compare above the jump:

Code:
0040194A  |.  3B45 F8       CMP EAX,DWORD PTR SS:[EBP-8]


EAX = entered password
DWORD PTR SS:[EBP-8] = correct password
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Fuzz
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PostPosted: Wed Jul 23, 2008 5:48 pm    Post subject: Reply with quote
But can you guess the fromula to legitly get the password?
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atom0s
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PostPosted: Wed Jul 23, 2008 6:05 pm    Post subject: Reply with quote
Fuzz wrote:
But can you guess the fromula to legitly get the password?


Code:
004018CD  |.  50            PUSH EAX                                 ; /pLocaltime
004018CE  |.  FF15 94B14700 CALL DWORD PTR DS:[<&KERNEL32.GetLocalTi>; \GetLocalTime
004018D4  |.  3BF4          CMP ESI,ESP
004018D6  |.  E8 D5700000   CALL Fuzz's_E.004089B0
004018DB  |.  8B4D F0       MOV ECX,DWORD PTR SS:[EBP-10]
004018DE  |.  81E1 FFFF0000 AND ECX,0FFFF
004018E4  |.  894D E4       MOV DWORD PTR SS:[EBP-1C],ECX
004018E7  |.  8B55 F2       MOV EDX,DWORD PTR SS:[EBP-E]
004018EA  |.  81E2 FFFF0000 AND EDX,0FFFF
004018F0  |.  8B45 E4       MOV EAX,DWORD PTR SS:[EBP-1C]
004018F3  |.  03C2          ADD EAX,EDX
004018F5  |.  8B4D E8       MOV ECX,DWORD PTR SS:[EBP-18]
004018F8  |.  81E1 FFFF0000 AND ECX,0FFFF
004018FE  |.  03C1          ADD EAX,ECX
00401900  |.  8945 F8       MOV DWORD PTR SS:[EBP-8],EAX

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