interactive_session_on_remote_endpoint_with_powershell.yml

name: Interactive Session on Remote Endpoint with PowerShell
id: a4e8f3a4-48b2-11ec-bcfc-3e22fbd008af
version: 4
date: '2023-11-07'
author: Mauricio Velazco, Splunk
status: production
type: TTP
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.
data_source:
- Powershell Script Block Logging 4104
search: '`powershell` EventCode=4104 (ScriptBlockText="*Enter-PSSession*" AND ScriptBlockText="*-ComputerName*")
  | stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
  Computer UserID | rename Computer as dest | rename UserID as user| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `interactive_session_on_remote_endpoint_with_powershell_filter`'
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.
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.
references:
- https://attack.mitre.org/techniques/T1021/006/
- https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/enter-pssession?view=powershell-7.2
tags:
  analytic_story:
  - Active Directory Lateral Movement
  asset_type: Endpoint
  confidence: 50
  impact: 90
  message: An interactive session was opened on a remote endpoint from $dest$
  mitre_attack_id:
  - T1021
  - T1021.006
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - EventCode
  - Message
  - ComputerName
  - User
  risk_score: 45
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1021.006/lateral_movement_pssession/windows-powershell-xml.log
    source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
    sourcetype: xmlwineventlog