Defense & IR · pro · solved in-browser (no VM needed) · 3 tiered hints
Write a bash script /home/player/detect.sh that reports the IPs hammering SSH. It must start with a bash shebang, use awk to scan /var/log/secure for 'Failed password' lines, and pipe the extracted source IPs through sort, uniq -c and sort -rn so the busiest attacker appears first. (Authored config, graded structurally — the engine isn't run here.)
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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.
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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.