hacktooth's hacktooth crackme #3

Author:
hacktooth

Language:
C/C++

Upload:
2023-11-28 13:40

Download

Platform:
Windows

Difficulty:
3.0

Quality:
4.5

Arch:
x86-64

Downloads:
9

Writeups:
0

Comments:
12

Description

Rules: Find the algorithm and write a keygen. This program contain a simple anti debug system. Good luck!

Comments (12)
Writeups (0)

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nightxyz on 2023-12-01 16:08: [Click to reveal]

hacktooth on 2023-12-01 19:23: ops bug my bad xD

hacktooth on 2023-12-01 19:24: Do you find the algorithm? @nigthxyz

nightxyz on 2023-12-01 22:39: @hacktooth No. I found serial in dump view and the others are brute force and some luck :)

kkk on 2023-12-03 05:10: algorithm is straightforward

Schuemi on 2023-12-04 17:46: nice, thank you. Found the calculation and the very simple anti debug system. I used Wine, so the anti debug system didn't work ;)

hacktooth on 2023-12-04 20:19: @schuemi im going to fix this crap made by me

KillerThrown on 2023-12-19 02:03: Thanks for the Crack Me. Although I did not manage to make a keygen like you said. I did however made some progress in terms of learning about reversing functions and so on. So, once again thanks. I used IDA for a bit and found that after the serial is taken from the user a function is called in which the address '0x2380E0' is stored into function var 'v1' and later on is dereferenced to compare to a copy of the serial string that the user provided. This is the code im talking about, { v1 = (void **)Block; while ( *v1 == *serial_str_cpy ) { ++v1; ++serial_str_cpy; v3 = v2

KillerThrown on 2023-12-19 02:11: So, now you can write your own program or use something like CheatEngine to get the correct serial via the address '0x2380E0' (string[10] btw) to your username and password. The solution is a bit of a workaround but it is what it is. Thx again for the crack me!!!!

HateTeamsAndHatePPL on 2024-01-30 18:51: To help : The algo is inside the "FUN_00d91b10" - "FUN_00d91920". it take the username and password perform some xoring. Another function take the result and convert it to string and add some "-". Similar to : for(int i = 0; i

HateTeamsAndHatePPL on 2024-01-30 18:52: for(int i = 0; i

HateTeamsAndHatePPL on 2024-01-30 18:53: it look like i can't paste the algo here, still a nice crackme

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crackmes.one

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hacktooth's hacktooth crackme #3