janisito's Crackeli Crackme
| Download Janisitos_Crackeli_Crackme_II.zip, 10 kb (password: crackmes.de) Browse contents of Janisitos_Crackeli_Crackme_II.zip Janisito's Crackeli Crackme II
Difficulty: 4 - Needs special knowledge | RatingWaiting for at least 3 votes View profile of janisito » |
Solutions
Solution by lithium, published 16. jun, 2007; download (35 kb), password: crackmes.de or browse.
lithium has rated this crackme as quite nice.
Discussion and comments
| red477 05. Nov 2006 | Interesting, lost my way drilling it...will try harder. Just one thing, is it really composed with assembler language? |
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| janisito Author 05. Nov 2006 | It is written in Visual Studio (C++), but almost all code is inline assembly. Keep going, you'll beat it! |
| DaBookshah 07. Nov 2006 | Is it just me or is this thing removing my memory breakpoints? Bad Crackme! Bad! |
| janisito Author 07. Nov 2006 | : ) Hahaha... the frustration of a cracker. Why is it a bad crackme? It does not tamper with your breakpoints, you only need to put them in the right place. |
| DaBookshah 07. Nov 2006 | I know. I'm just up to the bit with the self modifying code. Because it only does modifications, and not a direct overwrite, memory breakpoint corrupts the code. |
| janisito Author 08. Nov 2006 | Is anybody close to breaking this one? I don't think this crackme is that hard. |
| DaBookshah 09. Nov 2006 | I pretty much hit a dead end. There's a call [eax] instruction which throws an exception, where eax is based on the entered serial. Either: 1. This is actually meant to go somewhere. 2. This is meant to throw an exception. But the exception handling code is a dead end. |
| DaBookshah 09. Nov 2006 | Actually, is it possible this is a bug? I mean, if you enter certain characters(without running in the debugger), it just freezes. Is this intentional? |
| janisito Author 09. Nov 2006 | You should examine the exception handler a little more. |
| DaBookshah 10. Nov 2006 | Thanks That helps |
| janisito Author 16. Nov 2006 | Did anyone crack this one yet? I'd really like to see a tutorial on this one. |
| janisito Author 18. Jun 2007 | Nice solution by Lithium! Well done! |
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