Plan
archived
Tengu Botnet Uses Hardware Watchdog to Survive Process Kills on Linux
- Engineer — Plan: Any Linux device with Telnet exposed and weak credentials is a candidate target; audit your estate for Telnet listeners, disable them, and review hardware watchdog configurations on edge/IoT devices so defenders can’t be stymied by the reboot-on-kill mechanism.
- SOC/IR — Plan: Build or tune detections for Telnet brute-force login bursts against Linux endpoints and flag unexpected device reboots following process termination events; update IR runbooks to account for the watchdog reboot loop before attempting to kill botnet processes on compromised hosts.
- Leader — Learn: A novel DDoS botnet persistence technique that complicates incident response on Linux devices — no immediate leadership action required, but useful context if DDoS risk or IoT/edge device exposure comes up in a risk review.
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