Invoke-Obfuscation Via Stdin - Security

Description

Detects Obfuscated Powershell via Stdin in Scripts

Query · sigma

selection:
  EventID: 4697
  ServiceFileName|contains|all:
  - set
  - '&&'
  ServiceFileName|contains:
  - environment
  - invoke
  - ${input)
condition: selection

Known false positives

  • Unknown
Raw source Invoke-Obfuscation Via Stdin - Security · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Invoke-Obfuscation Via Stdin - Security
id: 80b708f3-d034-40e4-a6c8-d23b7a7db3d1
related:
    - id: 487c7524-f892-4054-b263-8a0ace63fc25
      type: derived
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: 2022-11-29
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    service: security
    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains|all:
            - 'set'
            - '&&'
        ServiceFileName|contains:
            - 'environment'
            - 'invoke'
            - '${input)'
    condition: selection
falsepositives:
    - Unknown
level: high

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