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@nullsiryn

Null Siryn

@nullsiryn

Read it. Don't Overthink it.

Uttar Pradesh, IndiaJoined May 2025

About

Barely Tame CTF Player. Debugging Addict. Worshipper of Wi-Fi Signals. Human? Depends on the Ping.

Null Siryn's blogs

CaptureTheFlagsctfs.hashnode.dev31 posts

About

Barely Tame CTF Player. Debugging Addict. Worshipper of Wi-Fi Signals. Human? Depends on the Ping.

Null Siryn's blogs

CaptureTheFlagsctfs.hashnode.dev31 posts

Recently published

ctfs.hashnode.dev

Bits Krieg CTF: Cider Vault Solution & Linux Heap Exploitation Guide

Challenge Description Welcome to the Storybook Workshop! In this post, we are going to break down Cider Vault, an incredibly well-designed CTF challenge that serves as a masterclass in modern Linux he

9h ago·11 min read

ctfs.hashnode.dev

Solving LACTF Lazy Bigrams: Phonetic Bigram Substitution Challenge

Detailed Walkthrough The challenge provides us with a Python script, chall.py, and a ciphertext file, ct.txt. Our goal is to reverse the encryption process to recover the flag. Analyzing the Encryption Script We begin by examining the logic in chall....

Feb 8·3 min read

ctfs.hashnode.dev

Solve LACTF Tic-Tac-No Challenge: OOB Write Exploit Guide

Challenge Walkthrough 1. Introduction In this challenge, we are presented with a Tic-Tac-Toe game written in C. The game uses a "Minimax" algorithm, which is a mathematical way for a computer to play perfectly. Under normal circumstances, you can onl...

Feb 8·3 min read

ctfs.hashnode.dev

Custom Packaging CTF Writeup: Decrypting the Custom KCF Container

Challenge Description Category: ForensicsAuthor: qvipin Our threat intel team has been tracking KRAMPUS SYNDICATE for months now. Last week, we finally caught a break. We intercepted a file transfer between two of their operatives, some kind of encry...

Jan 1·8 min read

ctfs.hashnode.dev

Trust Issues CTF Writeup: AWS IAM Privilege Escalation

Challenge Description Category: MiscellaneousAuthor: qvipin KRAMPUS SYNDICATE managed to get one of their operatives hired as an external contractor at NPLD's cloud infrastructure team. They've been given minimal access, but NPLD's IAM policies are.....

Jan 1·3 min read