Pytask

Platform: rev-kids20.forkbomb.ru | Category: Reversing | Type: Challenge | Difficulty: Easy | OS: NA | Author: XESXOR | Date: 2026-03-09 | Status: Solved Techniques: hex_pair_reversal, pyc_decompilation

Summary

Download binary: pytask.pyc. Python compiled bytecode file.

Pytask — Reverse Kids 2.0

Description

Download binary: pytask.pyc. Python compiled bytecode file.

Analysis

Decompiling the .pyc file with uncompyle6 reveals that the flag is encoded by reversing each hex pair (e.g., character 'S' = 0x53 → '35x0').

Solution

Decompile the .pyc, analyze the encoding algorithm, apply the reverse operation — flip each hex pair back. ‍​‌‌​​​​‌​‌‌​​‌‌​​‌‌​​‌‌​​‌‌​​‌​​​​‌‌​​​​​‌‌​​‌‌​​‌‌​​‌​‌​‌‌​​‌​‌‍