Defense & IR · easy · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/cron.d/aide-check to run a daily filesystem integrity scan. Set a safe PATH= line for cron, then add a single job that runs as the root user (the 6-field cron.d form: minute hour dom mon dow USER command) invoking aide with its --check (or -C) option. (Authored config, graded structurally — the engine isn't run here.)
▶ Start this challengeNobody has solved this one yet — be the first clear on the leaderboard.
Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.
Incident response: evict rogue accounts, eradicate persistence, attribute a breach.
See all Defense & IR challenges →
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.
How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.