Defense & IR · medium · live throwaway Linux box · 3 tiered hints
List every command scheduled in /etc/cron.d (the part after the user field), one per line sorted, to /home/player/c.txt.
▶ Start this challengePress start and you get your own real, disposable Linux VM — in the browser terminal or over SSH. Work the task on a live system; tmpfs.tech grades your solution automatically against the actual machine state, then throws the box away. No install, free to try as a guest.
Incident response: evict rogue accounts, eradicate persistence, attribute a breach.
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Is it free? Yes — play as a guest, no signup required to start.
Do I need to install anything? No. Everything runs in your browser, or connect over SSH if you prefer your own terminal.
How is it graded? Automatically and deterministically — your work is checked against the real state of the machine you worked on.