4epuxa on 8:37 AM 02/20/2021: Name: 4epuxa
Password: 599
You don't even need to disassemble the algorithm to understand what is required of you. It seems that each character of your name is summed up and you get some kind of number and you need to enter this number. (As for the amount, I'm not sure, because I did not analyze the algorithm, I just saw what was being compared with what, but it turned out to be unnecessary to disassemble the algorithm. Well, although, if you want, you can do it). Crackme is pretty easy, as I have already encountered this algorithm before.
dev316 on 2:56 PM 02/20/2021: I used a debugger to figure out how to crack this. Not crazy difficult but the disassembly is ridiculous. Is it just me or does the VS compiler make the assembly more difficult to follow than GCC, as an example? Even the statically linked ELF binaries are just easier to follow for me. I have never really been able to figure how to statically analyze PE files that are stripped. Just searching for main is a battle with these. Anyone else have similar experiences?
4epuxa on 4:06 PM 02/20/2021: dev316, i just have traced over all function and where debugger eip line dissapeared there is the main function
kemo on 5:59 AM 02/28/2021: i just took the easy way and patched jn to jnz on the password check (3B 45 B8 74 37 to 3B 45 B8 75 37), thanks for the cool crack me :)
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