crackmes.one

VSEC's VSEC Challenger Num #6

Author:
VSEC

Language:
C/C++

Upload:
2026-10-21 03:23

Platform:
Windows

Difficulty:
4.0

Quality:
4.0

Arch:
x86-64

Downloads:
14

Size:
777.50 KB

Writeups:
0

Comments:
1

Description

Challenge Rules 1.You may use AI (REA etc.) to help solve the challenge. 2.You may patch the binary, but you must comment the correct flag. 3.You can recover the program serial by reverse-engineering the algorithm 4.You may optionally explain your solution method. 5.For compression file packed with UPX 6.Serial number format is XXXX-XXXX-XXXX-XXXX 7.Correct flag starts with CMO... Thanks.

Labels ?

String / data encryption XOR Packer UPX Crypto / hash algorithm Other / custom hash Code virtualization / VM Control-flow obfuscation Spaghetti / junk-branch Indirect / computed jumps & calls State machine / dispatcher Control-flow flattening (CFF) Return-address / stack-based Anti-disassembly Junk / garbage bytes Opaque predicates Overlapping / misaligned instructions Jump-based desync