genass3's Patch Protect v3

Author:
genass3

Language:
C/C++

Upload:
2025-10-19 17:53

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Platform:
Windows

Difficulty:
4.5

Quality:
4.0

Arch:
x86-64

Downloads:
50

Size:
19.00 KB

Writeups:
1

Comments:
2

Description

source - https://github.com/generin0/crackme2 (contain correct password, be careful) - better protection - added anti-debug - improved XOR - fully rewrited password algorithm i was trying to do my best, so i think this version must be much stronger in protection than the v2 one, ur goal is to find the correct password, one way or other. feel free to feed back, and please let me know if evading patch protection was easy again. also, you can even not reverse this to find the password, enjoy! :)

Comments (2)
Writeups (1)

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lexx on 2025-10-20 08:00: [Click to reveal]

ultrazvukoff on 2025-10-20 16:58: The function sub_140001850 implements a custom encoding scheme using the following steps: Key Addition: Each byte of the input password is added to the corresponding byte from a predefined constant array: adgjmpsvyBEHKNQTWZ258behknqtwzCF. Position Offset: The index (position) of the current character is added to the result of the previous step. Masking: The sum is masked with 0x3F, effectively keeping only the lower 6 bits (resulting in a value in the range 0–63). Substitution: This masked value is used as an index into a 62-character alphabet string. Comparison: The resulting character is compared against a precomputed reference string (obtained by decoding an expected output). The algorithm is reversible in principle, but recovering the original password requires brute-forcing possible modular combinations for each byte due to the loss of information during the masking step. The anti-debugging measures weren’t even needed—the entire analysis was carried out directly in IDA Pro.

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Solution by lexx on 2025-10-20 08:11:
solution in python

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crackmes.one

crackmes.one

genass3's Patch Protect v3