Sample rules
Remote Process Instantiation via WinRM and PowerShell
- source: splunk
- technicques:
- T1021
- T1021.006
Description
This analytic looks for the execution of powershell.exe with arguments utilized to start a process on a remote endpoint by abusing the WinRM protocol. Specifically, this search looks for the abuse of the Invoke-Command commandlet. Red Teams and adversaries alike may abuse WinRM and powershell.exe for lateral movement and remote code execution.
Detection logic
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_powershell` (Processes.process="*Invoke-Command*" AND Processes.process="*-ComputerName*") by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `remote_process_instantiation_via_winrm_and_powershell_filter`
Remote Process Instantiation via WinRM and PowerShell Script Block
- source: splunk
- technicques:
- T1021
- T1021.006
Description
The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of PowerShell with arguments utilized to start a process on a remote endpoint by abusing the WinRM protocol. Specifically, this search looks for the abuse of the Invoke-Command commandlet. Red Teams and adversaries alike may abuse WinRM for lateral movement and remote code execution.
Detection logic
`powershell` EventCode=4104 (ScriptBlockText="*Invoke-Command*" AND ScriptBlockText="*-ComputerName*")
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer user_id
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `remote_process_instantiation_via_winrm_and_powershell_script_block_filter`