profdracula's Cryptok KeygenMe {3}
| Download Cryptok_KeygenMe_.zip, 35 kb (password: crackmes.de) Browse contents of Cryptok_KeygenMe_.zip Prof. DrAcULA presents, Cryptok KeygenMe {3}
Difficulty: 3 - Getting harder | Send a message to profdracula » View profile of profdracula » |
Solutions
Solution by red477, published 23. feb, 2007; download (36 kb), password: crackmes.de or browse.
red477 has rated this crackme as awesome.
Discussion and comments
| red477 05. Feb 2007 | i am foolish enough to get the prize!:D but, can you pm me a hint on how to keygen it, do i have to brute force the md5? at last, I like your crackmes, they are nice;) |
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| profdracula Author 05. Feb 2007 | Hi red477, when I say : "You have to get foolish", it means you have to let yourself befooled by the KeygenMe(KNOWINGLY). Its a hint in itself :) And for keygenning, you don't have to bruteforce MD5, because there is nothing to bruteforce in it. Look somewhere else. |
| Ox87k 10. Feb 2007 | i've some problem here: 004022DD |. 81F9 70617274 CMP ECX,74726170 how can it be possible? Ecx points to ntdll.someaddress and it's > than 74XXXXXXh while the Crc16 returns only XXXXh value so the sum never could be equal. Really confused! Some hints? |
| red477 11. Feb 2007 | @dreak, yes, i am killing by the serial checking routine, too. as you said, to generate a name from a serial is SO EASY, but to me it is nearly impossible to do it the other way... @Ox87k, bro, this time you have to be careful:) there is a little anti at the beginning, i dont think you overlooked that;) |
| profdracula Author 11. Feb 2007 | hi dreak, Ox87k and red477, if you see that code is changing itself, then its definitely (little) SMC[self-modifying-code]. But whether to use SMC, it takes this decision on some valid reason. But whether its using SMC or not both are vital for the solution to keygenme. And dreak, plz use PM's for sharing solving-methods, instead of posting them here. I think sharing solving-ideas here kills the joy of solution a bit :) |
| Ox87k 11. Feb 2007 | yes mates, sorry i didn't see this trick and thank you for your hint! lol btw, really hard this time! |
| red477 11. Feb 2007 | i wrote a keygen and submitted it. but probably it is not the way you want;) it works, anyway, and i hope it will be accepted:D |
| Markus 24. Feb 2007 | Great crackme. red477: How did you identify the BigNum library and its functions, did you name them manually? nice solution. thanks guys! |
| red477 24. Feb 2007 | @Markus:yes,manually. |
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