Suspicious PowerShell Invocations - Generic — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2017-03-12 / 2023-01-03.

{
  "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: 54a102facc7b98c18a7bd9165a54653fa308684cc03a1cdc7e664b1cc717c872

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: Suspicious PowerShell Invocations - Generic
id: ed965133-513f-41d9-a441-e38076a0798f
related:
    - id: 3d304fda-78aa-43ed-975c-d740798a49c1
      type: derived
    - id: bbb80e91-5746-4fbe-8898-122e2cafdbf4
      type: similar
status: test
description: Detects suspicious PowerShell invocation command parameters
references:
    - Internal Research
author: Florian Roth (Nextron Systems)
date: 2017-03-12
modified: 2023-01-03
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_encoded:
        ScriptBlockText|contains:
            - ' -enc '
            - ' -EncodedCommand '
            - ' -ec '
    selection_hidden:
        ScriptBlockText|contains:
            - ' -w hidden '
            - ' -window hidden '
            - ' -windowstyle hidden '
            - ' -w 1 '
    selection_noninteractive:
        ScriptBlockText|contains:
            - ' -noni '
            - ' -noninteractive '
    condition: all of selection*
falsepositives:
    - Very special / sneaky PowerShell scripts
level: high

Original YAML and metadata in JSON

False positives

• Very special / sneaky PowerShell scripts

Source references

• Internal Research (source note; no public URL supplied)