Invoke-Obfuscation Via Stdin — Sigma Rule

Rule metadata and linked tags

Author: Nikita Nazarov, oscd.community. Source status: test; severity: high. Source dates: 2020-10-12 / 2026-03-16.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 35b8347033e5e9168b1730a7fc77a99f08c0ec406d801686de2716bb8fee560f

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: Invoke-Obfuscation Via Stdin
id: 9c14c9fa-1a63-4a64-8e57-d19280559490
status: test
description: Detects Obfuscated Powershell via Stdin in Scripts
references:
    - https://github.com/SigmaHQ/sigma/issues/1009 # (Task28)
author: Nikita Nazarov, oscd.community
date: 2020-10-12
modified: 2026-03-16
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|re: '(?i)(?:set).*&&\s?set.*(?:environment|invoke|\$\{?input).*&&.*"'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/SigmaHQ/sigma/issues/1009