MC 5 (Dynamic Analysis)

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

Summary

Language: C. Binary only. "Guess the number again. Flag is the correct one."

MC 5 (Dynamic Analysis) — Reverse Kids 2.0

Description

Language: C. Binary only. "Guess the number again. Flag is the correct one."

ELF 64-bit, dynamically linked, stripped.

Analysis

The program compares input with a hardcoded number. Through disassembly we find the comparison constant.

Solution

Disassemble the binary, find the cmp instruction with constant REDACTED. ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍