Challenge Description This is an interactive Linux skills challenge where we connect to a remote service and reverse a series of layered…

Learn what the journal, audit log, syslog and package database actually record — and where each one stops.

Trace the process back through systemd units, cron jobs, login hooks, device rules, loaders, and boot entries to find what keeps starting…

A Backdoor That Blends Into Calls and Video The ClingSTUN Linux backdoor has learned to hide its command activity where network defenses expect ordinary calls and video chats. The malware uses pub…

Diving into Linux security layers that can restrict even privileged processes — seccomp, security modules, systemd sandboxing and more

Description : A place where you start at some point, and you have to go back to it in the end.

One developer uncovered a hidden backdoor that nearly compromised the internet.

Privilege escalation is one of the most important phases of a penetration test or Capture The Flag (CTF) challenge. In this challenge, I…

Linux File Search and Text Matching

Piecing together Linux evidence to uncover what ran, where it ran, how it started and what it left behind.