GobRAT File Discovery via Grep

This rule detects the execution of the 'grep' command on Linux systems when it is used to search for specific filenames associated with the GobRAT malware. The filenames include 'apached', 'frpc', 'sshd.sh', and 'zone.arm'. This activity indicates that an attacker, potentially using GobRAT, is attempting to discover files related to their malware deployment or persistence mechanisms.