1337ReverseEngineer's The Junkrat

Author:
1337ReverseEngineer

Language:
C/C++

Upload:
2022-07-23 15:07

Download

Platform:
Windows

Difficulty:
3.3

Quality:
4.7

Arch:
x86

Downloads:
11

Writeups:
1

Comments:
10

Description

Hard crackme. No patching! (You can patch antidebug ofc) Try to find secret key to get "Correct password" to print to the chat. Difficulty 3-4? If you need hints, please read hint.txt.

Comments (10)
Writeups (1)

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joaovitorbf on 2022-08-14 22:29: Great crackme! Solved it after some hours, struggled with the obfuscated strings. Using CyberChef and Python to investigate the strings the program was moving during debugging really helped. Learned a lot! :)

Rouzeee on 2022-08-26 12:14: kong strong pistaa panettamaan - pass супер легкий крякми ахъхахВАХЫВАХЫВХАЫВХА блять какой 3.0

CrushedKiwi on 2022-08-28 08:37: really awesome challenge from pwn import xor ct = "822=" val = 0x53 print(xor(ct, val))

Sems on 2022-09-04 16:20: I put all the suppressable ascii characters into the program and created a table by writing them all decrpyt. Then I prepared the encrypted version of the checked password by looking at this table. I guess there was xor involved :D If so, how did you find out about it? I used a primitive method.

Sems on 2022-09-04 16:29: I just looked and yes, the key is 0x53 and it encrpyts our input with xor. For those who can't find it, this is the string checked with our xored input: 822n But I still don't know where I should detect this xor process. If anyone knows, I hope you can enlighten me as well.

Sems on 2022-09-04 16:30: lol crackmes.one doesn't let me show you the whole key, I guess it's related to anti xss measures :P But if you look a bit more I'm sure you can find it.

Delirium on 2022-09-12 09:11: I don't know why, but the last character was playing up for me. I ended up just brute-forcing it.

1337ReverseEngineer on 2022-09-16 17:25: Glad you guys liked it ;)

1337ReverseEngineer on 2022-09-16 17:53: source code here https://github.com/islaitala/The-Junkrat

Codex231 on 2022-10-27 12:56: Awesome i had fun with this one :D .

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Solution by sa2304 on 2023-01-29 10:20:

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