DrPepUr's DrPepUr #3 [KeyGenMe]
| Download DrPepU_#3_KeyGenMe.zip, 5 kb (password: crackmes.de) Browse contents of DrPepU_#3_KeyGenMe.zip DrPepUr#3 KeyGenMe
Difficulty: 1 - Very easy, for newbies | Send a message to DrPepUr » View profile of DrPepUr » |
Solutions
Solution by kilobyte.asm, published 27. dec, 2009; download (15 kb), password: crackmes.de or browse.
kilobyte.asm has rated this crackme as quite nice.
Solution by ORacLE_nJ, published 27. dec, 2009; download (45 kb), password: crackmes.de or browse.
ORacLE_nJ has rated this crackme as quite nice.
Discussion and comments
| kcynice 14. Mar 2008 | I can re-write its algrithm,but the program cheat my ollyDbg.I hope some one would like to improve it,and mail me if him(or she) like.Thanks. |
|---|---|
| DrPepUr Author 14. Mar 2008 | I do not understand what you are trying to say. |
| kcynice 14. Mar 2008 | oh,i am sorry.I had uploaded my solution and left that comment. But I do not know why the solution has not shown by now.And I also sent a mail to you. That,my keygen only fits your program running under ollyDbg. |
| kcynice 14. Mar 2008 | in fact,the program didn't clear the right serial string in the memory,so,i changed the original file to make in display the right serial string other then wrong message when i typed a wrong serial string but had a right format. to write a keygen,i re-wrote its algrithm.but found that the serial strings are different between running alone and running in ollyDbg. So I do not know to to resolve it. |
| DrPepUr Author 14. Mar 2008 | I think the admins look over the solutions before they put them up, however if your keygen does not work outside of ollydbg, you need to go back in and find out why. This is not a bug in the program it is intentional.....if you still can't figure it out drop me another email and I will give you a hint. |
| kcynice 14. Mar 2008 | my keygen work well now.but i could not update my uploaded solution now. someones needed will be welcom to mail me to gain a solution: kcynic@163.com I also is a newbie,this is my first practice. thnx DrPepUr |
| TiGa 15. Mar 2008 | Yes, we check every keygen with a list of names outside the debugger. It would be a bad idea for people to learn from faulty solutions. Also if the keygen is not compiled, the solution is rejected automatically. |
| kcynice 16. Mar 2008 | OK.I will update a new one with executable file again. |
| ORacLE_nJ 19. Dec 2009 | Can you please give a hint... I found a serial for my name, but it doesnt work outside the debugger.. I saw your post & decided to ask you for a hint.. This is the key i found to be working in the debugger.. Name: Administrator S/N: B753B5-9267AD9EB161818F9 I keygenned it too.. But it doesnt work outside the debugger... And one more question, PUSH 004040D8 ; /String = "Thank You For Taking The Time To CrackMe ! ; - )" CALL <JMP.&kernel32.OutputDebugString>; \OutputDebugStringA What is the role of these lines in the keygenme?? Pls help me.. I'm a newbie.. |
| kilobyte.asm 20. Dec 2009 | google OutputDebugStringA to find out what it does, search for API references in code to find out where it is called then check the return values and see what it is stored as and then follow that value through out the program. hope that helps a little. |
| ORacLE_nJ 21. Dec 2009 | Thanx kilobyte.asm.. :-) This is what i found from Win32Api Reference _________> The OutputDebugString function sends a string to the debugger for the current application. Return Values This function does not return a value. Remarks If the application has no debugger, the system debugger displays the string. If the application has no debugger and the system debugger is not active, OutputDebugString does nothing. <________ But in this keygenme i didnt understand how it affects the serial generation.... Hope i'm being clear.. |
| kilobyte.asm 21. Dec 2009 | step through the subroutine at 401000, after execution of OutputDebugString, something is definately returned in eax, then stored in 40445C, find references to this address constant in olly and follow the value about. Anyways outputdebugstring should return a 1 in eax in normal conditions(when not being ran under a debugger) according to the PDF I have on anti-debugging techniques. |
| ORacLE_nJ 23. Dec 2009 | Thank you kilobyte.asm.. I have successfully keygened it... I'll definitely post my solution soon.. :-) |
| kilobyte.asm 23. Dec 2009 | no problem, i'll post mine too when it's done. |
You may leave your comment, thoughts and discuss this crackme with other reversers here.
Acting childish will not be tolerated.
HTML and such will be left as-is, so don't try.