https://re4perz3d.github.io/tags/authored/Recent content in Authored on Re4perZ3dHugoenFri, 29 May 2026 00:00:00 +0000https://re4perz3d.github.io/writeups/cybertek/operation-ghostvein/Fri, 29 May 2026 00:00:00 +0000https://re4perz3d.github.io/writeups/cybertek/operation-ghostvein/A Linux DFIR challenge I authored: reconstructing an OFBiz exploitation, PAM backdoor, SSH pivot and DNS exfiltration from host artifacts and PCAPs.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/intro-to-volatility/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/intro-to-volatility/Windows memory forensics with Volatility 3: extracting system info, spotting malicious activity and recovering a file hash from a memory dump.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/obfuscated/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/obfuscated/Network forensics: extracting an obfuscated JavaScript file from HTTP traffic, deobfuscating it and decoding a reversed Base64 flag.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/punkvania/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/punkvania/A phishing campaign investigation: a fake indie-game landing page used as a lure, worked through indicator extraction and attribution.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/red-penguin/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/red-penguin/Threat intelligence questions on the RedPenguin cyber-espionage campaign, mapped against the MITRE ATT&CK framework.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/solarwinds-campaign/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/solarwinds-campaign/Investigating a suspicious email tied to the SolarWinds campaign: uncovering TTPs and indicators of compromise as a threat intel analyst.https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/vigenere/Mon, 10 Nov 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/securinets-beginner-ctf-2025/vigenere/A classical-cipher challenge: a known-plaintext attack on a Vigenère-encrypted flag to recover the key and decrypt the message.https://re4perz3d.github.io/writeups/cyberspark-ctf/arcane-door/Sun, 18 May 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/cyberspark-ctf/arcane-door/A beginner CTI challenge on the real-world ArcaneDoor APT campaign: TTPs, malicious software and exploited CVEs via MITRE ATT&CK.https://re4perz3d.github.io/writeups/cyberspark-ctf/backdoor/Sun, 18 May 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/cyberspark-ctf/backdoor/Analyzing SSH logs to uncover unauthorized access and a malware persistence mechanism.https://re4perz3d.github.io/writeups/cyberspark-ctf/discord-bot/Sun, 18 May 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/cyberspark-ctf/discord-bot/A misc challenge on Discord bot logic and permissions, manipulating bot behaviour to satisfy the flag conditions.https://re4perz3d.github.io/writeups/cyberspark-ctf/hello/Sun, 18 May 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/cyberspark-ctf/hello/Network forensics and password cracking: recovering an encrypted PDF shared over FTP and extracting the hidden flag.https://re4perz3d.github.io/writeups/cyberspark-ctf/magic-bytes/Sun, 18 May 2025 00:00:00 +0000https://re4perz3d.github.io/writeups/cyberspark-ctf/magic-bytes/Steganography and file-repair: image metadata analysis, extracting embedded content and fixing a corrupted JPEG.