Malicious ShellIntel PowerShell Commandlets — Sigma Rule

Rule metadata and linked tags

Author: Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems). Source status: test; severity: high. Source dates: 2021-08-09 / 2023-01-02.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1ad131b7f6ecbdd4665a9c684920bad3d05fe4743700c3a9a3ceeafb0aad94cd

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Malicious ShellIntel PowerShell Commandlets
id: 402e1e1d-ad59-47b6-bf80-1ee44985b3a7
status: test
description: Detects Commandlet names from ShellIntel exploitation scripts.
references:
    - https://github.com/Shellntel/scripts/
author: Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
date: 2021-08-09
modified: 2023-01-02
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Invoke-SMBAutoBrute'
            - 'Invoke-GPOLinks'
            # - 'Out-Minidump' # Covered in 89819aa4-bbd6-46bc-88ec-c7f7fe30efa6
            - 'Invoke-Potato'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/Shellntel/scripts/