Author:
Reiika

Language:
C/C++

Upload:
2026-10-13 05:08

Platform:
Unix/linux etc.

Points:
300

Quality:
4.5

Arch:
x86-64

Downloads:
110

Size:
14.19 KB

Solves:
14

Attempts:
25

Description

A serial crackme. The check does not run as native code - it executes as bytecode on a small stack machine whose program is XOR-encrypted in the binary and decrypted at runtime. Recover the VM's instruction set, dump and decrypt the bytecode, then invert a chained per-byte transform to find the serial. - Serial is exactly 16 characters; there is exactly one valid serial. - No username needed (not a keygenme) - just find the one accepted serial. - No patching: find the real serial. - Note: a light ptrace anti-debug is present. If you run it inside a sandbox/container that blocks ptrace, the valid serial may be rejected - run it on a normal host or neutralize the ptrace check. Linux x86-64 ELF, built with gcc -O2, stripped, no-pie.

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• Solves (14)