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cracktis

 
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nog_lorp
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Joined: 26 Feb 2006
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PostPosted: Wed Sep 03, 2008 5:53 am    Post subject: cracktis Reply with quote

4 letter password, figure it out.

Also, there is a chance it will stall instead of giving the failure message if the password is wrong.

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Zand
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Joined: 21 Jul 2006
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PostPosted: Wed Sep 03, 2008 7:49 am    Post subject: Reply with quote

Doesn't run for me...
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I'm a spammer
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Joined: 18 Apr 2007
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Location: Israel.

PostPosted: Wed Sep 03, 2008 8:59 am    Post subject: Reply with quote

xor 4010DC (DWORD Value: 0x2B49530D) with 0x6B696B65 to change the bytes to "push 402038", the good boy, notice the next instruction is call dword ptr ds:[402013], which is printf. (result would be "printf("ur winz!")")

At 4010BD there's an hidden opcode, if you NOP the first byte you'll notice that it's actually "MOV EAX,DWORD PTR DS:[402047]", you can also notice that the call to 401073 returns to 4010BE instead of 4010BD.

There's also an exception handler that prints "ur failz" (the bad boy message), so in case there's an exception (because of xor'ing the memory with the password) it prints ur fails.

The password is:
ekik

XOR 0x2B49530D (OR EAX,2B4953 at 4010DC) with 0x6B696B65 ("ekik") = 0x40203868. (PUSH 402038)
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nog_lorp
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PostPosted: Wed Sep 03, 2008 3:41 pm    Post subject: Reply with quote

That was fast Sad
Good work Very Happy

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