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Series
A structured walkthrough of all the challenges I solved from CyberStudents’ Advent of CTF 2025. This series documents each day’s puzzle with precise methodology, technical breakdowns, and reproducible exploitation steps.
Challenge Description Category: CryptographyAuthor: qvipin You step into the North Pole Security Operations Room for your first official briefing. Before you can even say a word, an elf swivels around in his chair and looks directly at you with a gri...
Challenge Description Category: ForensicsAuthor: a_person9852 A series of repeated authentication failures was detected against the FTP service. The traffic pattern matched known Krampus Syndicate infrastructure, indicating the beginning of their int...
Challenge Description Category: MiscellaneousAuthor: qvipin ⚠️ Bruteforcing subdomains is not required and will result in disqualification. Follow the records. Our monitoring systems have flagged suspicious DNS activity originating from a domain regi...
Challenge Description Category: Reverse engineeringAuthor: qvipin The break room buzzes with energy when you walk in. A crowd of elves has gathered around Jingle McSnark's desk, where a holographic scoreboard floats above a plate of half-eaten ginger...
Challenge Description Category: Web exploitationAuthor: thee2d Intelligence analysts from the North Pole Logistics Directorate (NPLD) have uncovered a covert online storefront operated by the KRAMPUS Syndicate. Its name? Kramazon. Looks familiar. Wor...
Challenge Description Category: Binary exploitationAuthor: _avyra NPLD analysts recovered a fragment of the KRAMPUS Syndicate’s KDNU-3B navigation firmware during a recent incident response sweep. The module appears to handle routing adjustments for ...
