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CTF Writeups

Detailed solutions and approaches to various CTF challenges

Reverse Engineering
December 21, 2025

TSGCTF - medicine

medicine (reversing)
TL;DR

Flag: TSGCTF{51gn4l_h4ndl3r_r0t13_x0r}

This challenge hides the flag check behind self-modifying code: it deliberately triggers SIGILL (ud2), and the signal han

theg1239
cat writeup.md
Difficulty:
Reverse Engineering
March 2, 2025

ACECTF - Significance of Reversing

Significance of Reversing
Challenge Information
  • Category: Reverse Engineering
  • Points: 200
  • Solves: 187
  • Difficulty: Easy
Description

Over the years, we hackers have be

theg1239
cat writeup.md
Difficulty:
Miscellaneous
March 2, 2025

ACECTF - Insanity Check

Insanity Check
Challenge Information
  • Category: Miscellaneous
  • Points: 200
  • Solves: 47
  • Difficulty: Insane (maybe not)
Description

You might've breezed through the easy

theg1239
cat writeup.md
Difficulty:
OSINT
March 2, 2025

ACECTF - Social Circles

Social Circles
Challenge Information
  • Category: OSINT
  • Points: 200
  • Solves: 44
  • Difficulty: Medium
Description

Hey guys, my friend is starting a gaming channel—go sub to

ant1v3n0m
cat writeup.md
Difficulty:
OSINT
March 1, 2025

ACECTF - For The Fans

For The Fans
Challenge Information
  • Category: OSINT
  • Points: 300
  • Solves: 40
  • Difficulty: Easy/Medium
Description

Challenge

Initia
theg1239
cat writeup.md
Difficulty:
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