View previous topic :: View next topic |
Author |
Message |
Noz3001 I'm a spammer Reputation: 26
Joined: 29 May 2006 Posts: 6220 Location: /dev/null
|
Posted: Sun Apr 20, 2008 8:25 am Post subject: Noz3001's CrackMe |
|
|
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 .
Difficulty: Noob
|
|
Back to top |
|
|
atom0s Moderator Reputation: 198
Joined: 25 Jan 2006 Posts: 8517 Location: 127.0.0.1
|
Posted: Sun Apr 20, 2008 8:43 am Post subject: |
|
|
gd64-4lp54ds-d6spGp456d-p4avrc3
_________________
- Retired. |
|
Back to top |
|
|
lurc Grandmaster Cheater Supreme Reputation: 2
Joined: 13 Nov 2006 Posts: 1900
|
Posted: Sun Apr 20, 2008 8:52 am Post subject: |
|
|
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.
_________________
|
|
Back to top |
|
|
Noz3001 I'm a spammer Reputation: 26
Joined: 29 May 2006 Posts: 6220 Location: /dev/null
|
Posted: Sun Apr 20, 2008 9:18 am Post subject: |
|
|
Wiccaan wrote: | gd64-4lp54ds-d6spGp456d-p4avrc3 |
Hehe, i've gotta get my encryption routine working for the next one .
Fancy telling us what you did to get the key? What debugger did you use?
lurc:
Yeah, that was well too easy .
|
|
Back to top |
|
|
atom0s Moderator Reputation: 198
Joined: 25 Jan 2006 Posts: 8517 Location: 127.0.0.1
|
Posted: Sun Apr 20, 2008 9:22 am Post subject: |
|
|
OllyDbg, locate the loop routine to check the key entered, breakpoint in several places to look at the stack and locate the unencrypted key.
_________________
- Retired. |
|
Back to top |
|
|
Noz3001 I'm a spammer Reputation: 26
Joined: 29 May 2006 Posts: 6220 Location: /dev/null
|
Posted: Sun Apr 20, 2008 9:24 am Post subject: |
|
|
Hmm, okay then. I need to look up some more anti-debug stuff for my next one . That was the main reason I wrote this one and it failed miserably .
|
|
Back to top |
|
|
|