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.

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Null Siryn's blogs

CaptureTheFlagsctfs.hashnode.dev31 posts

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Recently published

NSNull Sirynctfs.hashnode.devFeb 22 · 11 min read

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

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NSNull Sirynctfs.hashnode.devFeb 8 · 3 min read

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....

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NSNull Sirynctfs.hashnode.devFeb 8 · 3 min read

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...

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NSNull Sirynctfs.hashnode.devJan 1 · 8 min read

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...

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NSNull Sirynctfs.hashnode.devJan 1 · 3 min read

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.....

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Null Siryn

About

Available for

Null Siryn's blogs

Recently published

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

Solving LACTF Lazy Bigrams: Phonetic Bigram Substitution Challenge

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

Custom Packaging CTF Writeup: Decrypting the Custom KCF Container

Trust Issues CTF Writeup: AWS IAM Privilege Escalation

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Null Siryn

About

Available for

Null Siryn's blogs

Recently published

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

Solving LACTF Lazy Bigrams: Phonetic Bigram Substitution Challenge

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

Custom Packaging CTF Writeup: Decrypting the Custom KCF Container

Trust Issues CTF Writeup: AWS IAM Privilege Escalation