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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
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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
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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
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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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