Suspicious PsExec Execution with Renamed Service - Zeek
This rule detects the execution of PsExec or PAExec when the service name has been renamed from its default 'PSEXESVC'. It specifically looks for SMB file access events (smb_files) in Zeek logs where the path contains '\IPC$' and the name ends with '-stdin', '-stdout', or '-stderr', but filters out events where the name starts with 'PSEXESVC'. This helps to identify potentially malicious use of PsExec-like tools that attempt to evade detection by altering the service name, while reducing noise from legitimate PsExec usage or other PsExec clients.
Sigma
