/0xffMekaku's Cybersecurity BlogA blog sharing insights on cybersecurity, game design, and personal learning journeys. I love learning... Teaching helps me learning. As my Sifu says, learn the path then be the path. 2026-04-06T10:27:56+03:00 Deniz Yanar / Jekyll © 2026 Deniz Yanar /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png The 42,000 Credit Heist: Finding Zero-Day at 42 Schools2026-04-06T00:00:00+03:00 2026-04-06T08:30:09+03:00 /posts/founding-0day-in-42schools/ Deniz Yanar Introduction Recently found a 0day vulnerability in 42 schools network and performed local privilege escalation. Then discoverd an unauthorized admin portal and become the richest man in the 42schools. So I will talk about: how it all started, analaysis on the 0day, and the post exploitation phase. Motivation In our campus we have a towel, you know that famous towel from the actual book. It ... How Unreal Engine's Lyra Handles Game Events2025-09-14T00:00:00+03:00 2025-09-16T02:42:43+03:00 /posts/ue5-lyra-event-system/ Deniz Yanar Unreal Engine’s Game Message System Unreal Engine has one of the most elegant architecture designs I seen. Probably I will look more inside Unreal Engine and write about it in the future. In this post, we will turn our microscopes towards to Unreal Engine Lyra’s Game Message System. It’s more advanced way of game events or observer pattern. However, rather than trying to understand how it work... Process Hollowing: Deep Dive and x64-bit2025-07-31T00:00:00+03:00 2025-09-14T23:42:08+03:00 /posts/process-hollowing/ Deniz Yanar Introduction In this post, we’ll explore the inner workings of process hollowing on 64‑bit Windows, complete with a hands‑on C++ example. Many resources focus on 32‑bit or gloss over the 64‑bit pitfalls—this guide will address those gaps and help you avoid the common traps that can drive you crazy. What is Process Hollowing? Process hollowing is a stealthy technique in which an attacker: ...