Powershell WMI Persistence

Adversaries may establish persistence and elevate privileges by executing malicious content triggered by a Windows Management Instrumentation (WMI) event subscription.

title: Powershell WMI Persistence
id: 9e07f6e7-83aa-45c6-998e-0af26efd0a85
status: test
description: Adversaries may establish persistence and elevate privileges by executing malicious content triggered by a Windows Management Instrumentation (WMI) event subscription.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.003/T1546.003.md
    - https://github.com/EmpireProject/Empire/blob/08cbd274bef78243d7a8ed6443b8364acd1fc48b/data/module_source/persistence/Persistence.psm1#L545
author: frack113
date: 2021-08-19
modified: 2022-12-25
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1546.003
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_ioc:
        - ScriptBlockText|contains|all:
              - 'New-CimInstance '
              - '-Namespace root/subscription '
              - '-ClassName __EventFilter '
              - '-Property ' # is a variable name
        - ScriptBlockText|contains|all:
              - 'New-CimInstance '
              - '-Namespace root/subscription '
              - '-ClassName CommandLineEventConsumer '
              - '-Property ' # is a variable name
    condition: selection_ioc
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/powershell/powershell_script/posh_ps_wmi_persistence/info.yml

• T1546.003Windows Management Instrumentation Event Subscription

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.003/T1546.003.md↗
• https://github.com/EmpireProject/Empire/blob/08cbd274bef78243d7a8ed6443b8364acd1fc48b/data/module_source/persistence/Persistence.psm1#L545↗