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

Initia
theg1239
cat writeup.md
Difficulty: