Mirai-lineage DDoS bot
- Caught
- 14 Oct 2026, 13:16 UTC
- Where
- Our sensor in US West (San Jose)
- File
- Linux program, 64-bit x86
- Left behind
- a hidden copy of itself in
/var/tmp - a relaunch script,
/var/tmp/.sys_recovery.sh - a boot-time scheduled task,
/etc/cron.d/netupd - a system service,
netd.service - a startup script,
/etc/init.d/sys_daemon
- a hidden copy of itself in
- Shipped in
- Minaki Scan 0.8.0
One capture, start to finish
A sensor recorded the attack and kept the program the attacker left. We ran that program on an isolated test machine and watched what it changed. It sets up three separate ways to restart itself, so removing just one leaves it running.
The cure removes all three, stops every bot process, deletes the files and scans again: clean. We then set off every startup method the sample had installed, the way a restart would. Nothing came back and no bot process was left.
We call it Mirai-lineage rather than Mirai. It shares markers with Mirai and with a related family, Gafgyt, and nothing in it is unique to either.
Our first cure missed two of the three restart methods. We found them by looking harder at the sample before the cure shipped. That's why every cure is tested before it reaches you.
Read the Mirai page in the threat wiki, or see how we test every cure.