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Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the usage of the Enter-PSSession. This commandlet can be used to open an interactive session on a remote endpoint leveraging the WinRM protocol. Red Teams and adversaries alike may abuse WinRM and Enter-PSSession for lateral movement and remote code execution.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2021-11-18
  • Author: Mauricio Velazco, Splunk
  • ID: a4e8f3a4-48b2-11ec-bcfc-3e22fbd008af

ATT&CK

ID Technique Tactic
T1021 Remote Services Lateral Movement
T1021.006 Windows Remote Management Lateral Movement
powershell` EventCode=4104 (Message="*Enter-PSSession*" AND Message="*-ComputerName*") 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `interactive_session_on_remote_endpoint_with_powershell_filter`

Associated Analytic Story

How To Implement

To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup instructions can be found https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.

Required field

  • _time
  • EventCode
  • Message
  • ComputerName
  • User

Kill Chain Phase

  • Lateral Movement

Known False Positives

Administrators may leverage WinRM and Enter-PSSession for administrative and troubleshooting tasks. This activity is usually limited to a small set of hosts or users. In certain environments, tuning may not be possible.

RBA

Risk Score Impact Confidence Message
45.0 90 50 An interactive session was opened on a remote endpoint from $ComputerName

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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