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Thread: grandpa software cracking !

  1. #1

    grandpa software cracking !

    Hi there,

    I'm trying to crack an old software (2002), that one is harder than expected !
    Peid found no pack.

    Here is the Registration Box.
    http://img34.imageshack.us/img34/9297/63810981.jpg

    So I entered something into it, set a breakpoint on Softice :
    Code:
    GetWindowInfo
    Closed Softice and click "ok".

    Softice immediatly appeared, I try :

    Code:
    s 0 L ffffff 'my key here'
    Something was found here : 0023:0017D7A8

    So I set a new breakpoint on memory access
    Code:
    bpm 0023:0017D7A8
    What should I do next ?
    Thanks in advance.

    This software return no error strings when entering a wrong code.
    It is just starting with many bugs.

  2. #2
    <script>alert(0)</script> disavowed's Avatar
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    what tutorials have you read so far on this subject matter?

  3. #3
    Hello,

    Here : http://pifoman.free.fr/cours_cracking/cours_cracking.htm
    (In French).

  4. #4
    <script>alert(0)</script> disavowed's Avatar
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    you're read all 81 tutorials on that site?

  5. #5
    No, just some of them.

  6. #6
    <script>alert(0)</script> disavowed's Avatar
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    Try setting breakpoints on GetDlgItemText(...) and GetWindowText(...) to see where the string is read in. Then trace through to see what code is operating on the input.

  7. #7
    Softice can't recognize those BP's, what's wrong ?

  8. #8
    Musician member evaluator's Avatar
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    tape in Sice:
    exp GetDlg*

  9. #9
    <script>alert(0)</script> disavowed's Avatar
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    see http://msdn.microsoft.com/en-us/library/cc500321.aspx

  10. #10
    Hi Guys !

    Thanks for your tips, I set a BP (getwindowinfo) and saw my computer ID and my wrong registration key, but I have some troubles to follow the code...

    Is there anyway to compare a cracked exe file to a clean exe file to see the differences between them ?

  11. #11
    <script>alert(0)</script> disavowed's Avatar
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    http://lmgtfy.com/q=compare+binary+files

  12. #12
    Naides is Nobody
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    also the Eeye software is very handy for a more analytical comparison of software disassemblies.

  13. #13
    Great! thanks.
    By the way, I can't find the Eeye software.

    (except there : http://www.eeye.com/html/downloads/index.html)
    Last edited by staggy; July 1st, 2009 at 15:05.

  14. #14
    Naides is Nobody
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    I am referring to the binary diffing software found at

    http://research.eeye.com/html/home/index.html

    inside the site you already found. (it used to be linked in the face page).

  15. #15
    Administrator dELTA's Avatar
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    And I assume that neither of the 28 tools of the CRCETL category "Diff Tools" and its subcategories weren't satisfactory...

    http://www.woodmann.com/collaborative/tools/index.php/Category:Diff_Tools
    "Give a man a quote from the FAQ, and he'll ignore it. Print the FAQ, shove it up his ass, kick him in the balls, DDoS his ass and kick/ban him, and the point usually gets through eventually."

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