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Thread: Very Easy CrackMe

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  1. #1
    harmor
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    Very Easy CrackMe

    This is for the beginner just starting his venture into cracking.

    \*===================================*/
    1. Find the real serial number.
    2. Alter the code to allow it to accept any serial
    /*===================================*\
    Attached Files Attached Files
    Last edited by harmor; January 5th, 2007 at 23:52.
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  2. #2
    I was expecting something a bit more complex for that size... but this one was a bit disappointing seeing as a hex editor is all that's needed

    What the hell was it compiled with? A protection like this doesn't take four-hundred-thousand bytes

  3. #3
    harmor
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    The program has 22 lines and was compiled with Dev C++
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  4. #4
    Red wine, not vodka! ZaiRoN's Avatar
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    Good enough for real newbies

  5. #5
    Quote Originally Posted by harmor View Post
    The program has 22 lines and was compiled with Dev C++
    With "generate most bloated code possible" option enabled.

    I've seen entire apps with more complex protections than this in les than 1/10th the size (unpacked)...

  6. #6

    Easy Crack Me~~~

    Thank you for your Hardwork.
    so. later
    see you again.

  7. #7
    As LLXX said, the valid serial is waiting for us. =/
    Please consider donating to help Woodmann.com staying online (here is why).
    Any amount greatly appreciated. Thank you.

  8. #8
    treaxer
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    19654659119676XXX
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  9. #9
    Red wine, not vodka! ZaiRoN's Avatar
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    Hmm, nice number. What is it?

  10. #10
    Registered User
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    .text:00401429 mov [esp+88h+var_84], offset a19654659119676 ;

    BTW: why the generated exe is so large?
    Did you make use of template metaprogramming or other code bloating techniques? ? ?
    Last edited by begemott; March 27th, 2007 at 06:02.

  11. #11
    About half of it is useless debug info, 3/4 of the other half is probably std::cout and the rest of the standard bloated library, and of the 1/8th that's left, 1/10th of that would be the code and data contribution that he actually wrote.

    Me thinks he decided to link in everything so his serial couldn't be so easily found... though the compiler *does* put the data in its own section...

  12. #12
    i dont understand the excitement about size. its obvious why. and its an easy crackme

    thanks for posting it

  13. #13
    goqq2008
    Guest
    1. Find the real serial number.
    19654659119676414

    2. Alter the code to allow it to accept any serial
    00401437 . E8 1CAD0300 call 0043C158
    0040143C . 84C0 test al, al
    0040143E 74 16 je short 00401456 ; nop
    00401440 . C74424 04 2C0>mov dword ptr [esp+4], 0044002C ; the serial you entered is correct\n\n
    00401448 . C70424 C03344>mov dword ptr [esp], 004433C0
    0040144F . E8 44AD0300 call 0043C198
    00401454 . EB 1B jmp short 00401471
    00401456 > C74424 04 500>mov dword ptr [esp+4], 00440050 ; the serial is incorrect\n\n
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  14. #14
    Quote Originally Posted by goqq2008 View Post
    1. Find the real serial number.
    19654659119676414

    2. Alter the code to allow it to accept any serial
    00401437 . E8 1CAD0300 call 0043C158
    0040143C . 84C0 test al, al
    0040143E 74 16 je short 00401456 ; nop
    00401440 . C74424 04 2C0>mov dword ptr [esp+4], 0044002C ; the serial you entered is correct\n\n
    00401448 . C70424 C03344>mov dword ptr [esp], 004433C0
    0040144F . E8 44AD0300 call 0043C198
    00401454 . EB 1B jmp short 00401471
    00401456 > C74424 04 500>mov dword ptr [esp+4], 00440050 ; the serial is incorrect\n\n
    That is a spoiler! for anyone that wanted to try.

  15. #15
    vivekgupta1987
    Guest

    still can't understand

    i am new to this.

    i found real serial key using hexeditor as well as IDA (freeware) but first.exe says it is incorrect!!!

    i can't understand alteration code.
    How can i alter code in IDA or hexeditor?
    I promise that I have read the FAQ and tried to use the Search to answer my question.

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