about

i'm gatekeeperr, a young security researcher into binary exploitation and malware analysis. this site collects my writeups on real-world bugs, ctf challenges and blog posts about pwn and malware.

latest

blog · 2026-09-10 · 11 min read

The Workflow I Used to Find Bugs in Windows, VirtualBox, and Linux

A step-by-step breakdown of the workflow I used to find bugs in Windows, VirtualBox, and the Linux kernel.

writeup · 2026-08-09 · 3 min read

Claude Code ReDoS Vulnerability (closed as informative)

Bypassable ReDoS guard in the Claude Code security-guidance/hookify plugins lets a user-supplied regex hang the hook via catastrophic backtracking.

blog · 2026-07-25 · 4 min read

Setting Up a Windows Malware Analysis Lab

A step-by-step guide to setting up a Windows malware analysis lab in VMware, from installation to essential tools.

blog · 2026-07-09 · 4 min read

Fuzzing: stack buffer overflow in ticket parser

First fuzzing exercise: used AFL++ and ASan to find and exploit a stack buffer overflow in a custom C program, hijacking RIP to reach a win() function.

blog · 2026-06-02 · 2 min read

Binary Security Mechanisms: Stack Canary

A brief explanation of the stack canary and how to bypass it

writeup · 2026-05-25 · 4 min read

Split - ROP Emporium

ROP Emporium pwn challenge, exploiting using a short ROP chain.