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Noz3001's CrackMe

 
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Noz3001
I'm a spammer
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Joined: 29 May 2006
Posts: 6220
Location: /dev/null
PostPosted: Sun Apr 20, 2008 8:25 am    Post subject: Noz3001's CrackMe Reply with quote
So I thought i'd have a go at writing one of these things and here is the first version.

To beat it you can either just post the serial or patch it. The second one will be different and more difficult Wink.

Difficulty: Noob
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atom0s
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Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
PostPosted: Sun Apr 20, 2008 8:43 am    Post subject: Reply with quote
gd64-4lp54ds-d6spGp456d-p4avrc3
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lurc
Grandmaster Cheater Supreme
Reputation: 2

Joined: 13 Nov 2006
Posts: 1900
PostPosted: Sun Apr 20, 2008 8:52 am    Post subject: Reply with quote
To Patch:

Change

Code:
00401146     75 06          JNZ SHORT CrackMeV.0040114E


To

Code:
00401146     74 06          JE SHORT CrackMeV.0040114E


And you can enter any key.

Or change the Compare above.
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Noz3001
I'm a spammer
Reputation: 26

Joined: 29 May 2006
Posts: 6220
Location: /dev/null
PostPosted: Sun Apr 20, 2008 9:18 am    Post subject: Reply with quote
Wiccaan wrote:
gd64-4lp54ds-d6spGp456d-p4avrc3


Hehe, i've gotta get my encryption routine working for the next one Wink.

Fancy telling us what you did to get the key? What debugger did you use?


lurc:

Yeah, that was well too easy Razz.
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atom0s
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PostPosted: Sun Apr 20, 2008 9:22 am    Post subject: Reply with quote
OllyDbg, locate the loop routine to check the key entered, breakpoint in several places to look at the stack and locate the unencrypted key.
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Noz3001
I'm a spammer
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Joined: 29 May 2006
Posts: 6220
Location: /dev/null
PostPosted: Sun Apr 20, 2008 9:24 am    Post subject: Reply with quote
Hmm, okay then. I need to look up some more anti-debug stuff for my next one Razz. That was the main reason I wrote this one and it failed miserably Smile.
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