name: Windows PowerShell Get CIMInstance Remote Computer
id: d8c972eb-ed84-431a-8869-ca4bd83257d1
version: 1
date: '2023-03-27'
author: Michael Haag, Splunk
type: Anomaly
status: production
data_source:
- Powershell 4104
description: This analytic identifies the use of Get-CimInstance cmdlet with the -ComputerName parameter, which indicates that the cmdlet is being used to retrieve information from a remote computer. This can be useful for detecting instances of remote access, such as when an attacker uses PowerShell to connect to a remote system and gather information. By monitoring for this cmdlet with the -ComputerName parameter, security analysts can identify potential malicious activity on remote systems and take appropriate action to mitigate any threats.
search: '`powershell` EventCode=4104 ScriptBlockText="*get-ciminstance*" 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)` | `windows_powershell_get_ciminstance_remote_computer_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 here
  https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
known_false_positives: This is meant to be a low risk RBA anomaly analytic or to be used for hunting. Enable this with a low risk score and let it generate risk in the risk index.
references:
  - https://learn.microsoft.com/en-us/powershell/module/cimcmdlets/get-ciminstance?view=powershell-7.3
tags:
  analytic_story:
  - Active Directory Lateral Movement
  asset_type: Endpoint
  confidence: 50
  impact: 30
  message: A PowerShell Cmdlet Get-CIMInstnace was ran on $Computer$, attempting to connect to a remote host.
  mitre_attack_id:
  - T1059.001
  observable:
  - name: Computer
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - ScriptBlockText
  - Computer
  - EventCode
  risk_score: 15
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/atomic_red_team/get_ciminstance_windows-powershell.log
    source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
    sourcetype: xmlwineventlog