Hunting Suspicious SSH and Reconnaissance Activity

Daniel Jeremiah@daniyyell

•updated Mar 13, 2026•4•0•172

This rule detects suspicious command-line activity indicative of SSH tunneling, external IP checks, and reconnaissance commands. It looks for specific IP addresses associated with known C2 or SSH tunnel infrastructure, SSH command-line options like 'StrictHostKeyChecking=no' and reverse tunnel flags ('-R', '-N'), the use of 'ifconfig.me' for external IP discovery, and various 'whoami' and 'groups' commands for system reconnaissance. It also flags activity related to 'FMAPP.exe' or 'FMAPP.dll'.