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Crackme

 
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&Vage
Grandmaster Cheater Supreme
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Joined: 25 Jul 2008
Posts: 1054

PostPosted: Sat Dec 12, 2009 6:25 pm    Post subject: Crackme Reply with quote

Smile

http://massmirror.com/5a5d2dacf430debec436cedfdcec48b1.html
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&Vage
Grandmaster Cheater Supreme
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Joined: 25 Jul 2008
Posts: 1054

PostPosted: Tue Dec 15, 2009 3:24 pm    Post subject: Reply with quote

Lol no one?
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SunBeam
I post too much
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Joined: 25 Feb 2005
Posts: 4013
Location: Romania

PostPosted: Tue Jan 05, 2010 6:20 am    Post subject: Reply with quote

SEH? Smile Nice..
_________________
More stuff on sb.deviatted.com. Work in progress.
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haha01haha01
Grandmaster Cheater Supreme
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Joined: 15 Jun 2007
Posts: 1233
Location: http://www.SaviourFagFails.com/

PostPosted: Wed Jan 06, 2010 11:30 am    Post subject: Reply with quote

&Vage wrote:
Lol no one?
It would help if you hosted it on some normal file hosting site that actually lets people download over 5% of the time.
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DoomsDay
Grandmaster Cheater
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Joined: 06 Jan 2007
Posts: 768
Location: %HomePath%

PostPosted: Wed Jan 06, 2010 12:29 pm    Post subject: Reply with quote

Cracking is easy... I'll find the time to dig into that password later...
As for a patching solution:
mov [403096],401760 (instead of 401740)
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haha01haha01
Grandmaster Cheater Supreme
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Posts: 1233
Location: http://www.SaviourFagFails.com/

PostPosted: Wed Jan 06, 2010 1:33 pm    Post subject: Reply with quote

Okay, I managed to download it. That's one complicated shit over there, lol.

It looks like everything is happening at 401030, but all that function looks so random. It loops n times and in each loop it:
1.grabs a byte from an offset decided in the previous loop (EAX as base+EDI as offset)
2.do some sort of a pointless loop that makes ESI = the byte we took before -1 (unless that byte is over 1C, in which case it jumps to stage 4)
3.pushing EDI as argument and calling the ESIth DWORD from an array of functions (one of them writing the 40173F that later turns into 401740 into the CONTEXT structure in the stack)
4.add some byte (the result of the function from stage 3?) to EDI

So basically in that function almost everything is decided by the result of the previous loop, even the functions to call and all. and we need that when it reaches the function at 401320 (was round #5 for me, not sure if it's constant, pretty sure it's not) EDI will be 15 instead of 11 (then the correct pointer is written and were correct).
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&Vage
Grandmaster Cheater Supreme
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Joined: 25 Jul 2008
Posts: 1054

PostPosted: Fri Jan 08, 2010 3:49 pm    Post subject: Reply with quote

SunBeam wrote:
SEH? Smile Nice..
Thanks, a friend of mine told me this method Razz

haha: Trace the buffer
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