Security research, DFIR & malware analysis, and CTF writeups.https://immortal-ibr.github.io/https://immortal-ibr.github.io/posts/cheater-catf-2026/https://immortal-ibr.github.io/posts/cheater-catf-2026/A full reconstruction of an anonymous ChatGPT chat from a Windows memory image: this is a writeup for my DFIR challenge in CAT CTFSat, 12 Sep 2026 00:00:00 GMTCTF AuthorDFIRMemory ForensicsBrowser ForensicsWindowsVolatilityDiscordChatGPThttps://immortal-ibr.github.io/posts/memnixfs/https://immortal-ibr.github.io/posts/memnixfs/Linux Memory Forensics Framework That Transforms Memory Dumps Into a Navigable FilesystemMon, 22 Jun 2026 00:00:00 GMTToolsDFIRMemory ForensicsC++Linuxhttps://immortal-ibr.github.io/posts/chainrecon/https://immortal-ibr.github.io/posts/chainrecon/ChainRecon is a framework for analyzing what an IoT device is actually doing on the network.Fri, 15 May 2026 00:00:00 GMTToolsIoTNetwork AnalysisAndroidFridaPythonToolinghttps://immortal-ibr.github.io/posts/0xl4ugh-v5-ctf-dfir-writeup/https://immortal-ibr.github.io/posts/0xl4ugh-v5-ctf-dfir-writeup/The official DFIR writeup for 0xL4ugh CTF v5.Sun, 25 Jan 2026 00:00:00 GMTCTF AuthorDFIRCTF0xL4ughhttps://immortal-ibr.github.io/posts/armfall-downfall-on-armv8/https://immortal-ibr.github.io/posts/armfall-downfall-on-armv8/Will Downfall work on popular ARM CPUs? We reproduced Intel's Gather Data Sampling attack on a Raspberry Pi 5 and an Apple M4 via NEON, and looked for a usable side channel.Mon, 15 Dec 2025 00:00:00 GMTResearchHardware SecurityMicroarchitectureARMNEONSide-ChannelsSpeculative Executionhttps://immortal-ibr.github.io/posts/egcert-ctf-2025-finals/https://immortal-ibr.github.io/posts/egcert-ctf-2025-finals/Walking through the forensics challenges from the EGCERT CTF 2025 finals.Tue, 27 May 2025 00:00:00 GMTWriteupsDFIRCTFForensicshttps://immortal-ibr.github.io/posts/aswan-ctf-finals-2025/https://immortal-ibr.github.io/posts/aswan-ctf-finals-2025/DFIR challenges from the Aswan CTF 2025 finals, solved and explained.Sun, 27 Apr 2025 00:00:00 GMTWriteupsDFIRCTFForensicshttps://immortal-ibr.github.io/posts/cat-x-csc-entry-level-ctf-2025/https://immortal-ibr.github.io/posts/cat-x-csc-entry-level-ctf-2025/DFIR writeup for the CAT X CSC entry-level CTF, aimed at people starting out.Sun, 16 Mar 2025 00:00:00 GMTCTF AuthorDFIRCTFBeginner