[serialme] Crackme level 1

[tehpro]

Your aim is to find the correct serial.

Level 1:http://www.sendspace.com/file/yaszb8

Edited February 23, 2013 by tehpro

[atom0s]

Not entirely sure this is the correct method of solving this one but here's the answer I got:

Congradulations, the challenge serial is: eBVcM01u

 

My method of getting it:

 - Open in Olly and step through and see how the program reacts.

 - Notice there is a string compare but the compare is comparing what we entered to 00.

 - Trace the location that is being compared and we get the location of:

00401496   . C74424 04 0930>MOV DWORD PTR SS:[ESP+4],Software.00443009

 

This is overwriting the pointer to the string that is being checked to an array of 3 null bytes.

 

Either nop the mov, or rewrite it to move 00443000 instead, which points to:

00443000  65 69 61 31 32 61 6C 6B 00                       eia12alk.

 

Run with the patch and it should accept: eia12alk

 

Another thing you could do is just patch the check here:

00401686   . 74 2E          JE SHORT Software.004016B6

[Teddy Rogers]

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