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Reverse Code Engineering RCE CD +sandman 2000
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gigatut.txt
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2000-05-25
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<How to find the right serial in GiGA┤s crackme 1>
--= Hi again =--
So you didnt manage to crack this one ? Well, hopefully this tut will
help you out a bit. Since the crackme was encrypted or packed, and
wont go into this it so deep. I will simply tell you how its done.
--= The crack =--
Fireupp the crackme and press ok on the info nag. Then put in your name
and any serial, dont press ok yet. Switch to softice and set a
breakpoint on getwindowtexta.
:bpx getwindowtexta
Switch back and press ok. Boom! Hopefully your now into softice. Press
F5 once and then F11 to load the fake serial and get to the breakpoint.
At this stage you can remove the breakpoint:
:bc *
Then press F12 once to get to the code we are looking for. Continue
the pressing, but use F10 instead and trace down the code until you
come to something that looks like this:
0040164C MOV EAX,[EDI+64] ;Our serial into eax
0040164F MOV ESI,00403100 ;The real serial into esi
.........
Below this, it starts comparing our serial against the real one,
but since we already go the serial, i dont have to write anymore.
Just do:
:d esi
and you will se the correct serial :)
Hope you had fun!
tarq