Invoke-Obfuscation Via Stdin - Powershell

Description

Detects Obfuscated Powershell via Stdin in Scripts

Query · sigma

selection_4104:
  ScriptBlockText|re: (?i)(set).*&&\s?set.*(environment|invoke|\$\{?input).*&&.*"
condition: selection_4104

Known false positives

  • Unknown
Raw source Invoke-Obfuscation Via Stdin - Powershell · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Invoke-Obfuscation Via Stdin - Powershell
id: 86b896ba-ffa1-4fea-83e3-ee28a4c915c7
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: 2024-04-05
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_4104:
        ScriptBlockText|re: '(?i)(set).*&&\s?set.*(environment|invoke|\$\{?input).*&&.*"'
    condition: selection_4104
falsepositives:
    - Unknown
level: high

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