Name      : Start Clean

Version   : generic

Editor    : Firas

Target    : startcln.exe

Tools     : Softice
            Brain
            
Cracker   : LW2000

Tutorial  : No.39




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DISCLAIMER
For educational purposes only!
I hold no responsibility of the mis-used of this material!
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1.      Ok, load start clean and click on register.
        Then enter LW2000 as Username and 1230099 as code.
        Press ok. *BOOM* A Error Messagebox pops up.

2.      Switch with [ctrl]+[d] to sice and set a breakpoint on the 
        function Getdlgitemtexta.
        
        BPX GetDlgItemtext


        Press F5 to contine. Try it again. *BOOM* Sice pops up.

        With F11 we get the Caller. Ok, trace with F10 till esp is moved
        into eax. Ok, d eax shows our serial.

3.      After a pair of F10s we see Lstrcmp and then Test EAX, EAX.

        When we take a look into the api help for LSTRCMP, we know that
        the two values must be saved before.

        value 1
        value 2
        compare

        So let's take a close look at the code. It saves eax (our s/n)
        and 00406030.  Mhhm, 'd 406030' *g*
        
        Ok, let's try this code...


Congratulation! You are a registered user.


FINISH! Easy, or?

cu LW2000
Any comments? Mail me LW2000@gmx.net !!!
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tKC, thx for your tutors!
I started with tutor 1 and i still read them... they are the best!