Powershell Inline Execution From A File — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2022-12-25 / not supplied.

{
  "product": "windows",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 8103d09f4cf9934967c67d3df7a939876eab8520f42238a5c83b22044a8d702c

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: Powershell Inline Execution From A File
id: ee218c12-627a-4d27-9e30-d6fb2fe22ed2
status: test
description: Detects inline execution of PowerShell code from a file
references:
    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=50
author: frack113
date: 2022-12-25
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: process_creation
detection:
    selection_exec:
        CommandLine|contains:
            - 'iex '
            - 'Invoke-Expression '
            - 'Invoke-Command '
            - 'icm '
    selection_read:
        CommandLine|contains:
            - 'cat '
            - 'get-content '
            - 'type '
    selection_raw:
        CommandLine|contains: ' -raw'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=50