HackTool - NoFilter Execution — Sigma Rule

Rule metadata and linked tags

Author: Stamatis Chatzimangou (st0pp3r). Source status: test; severity: high. Source dates: 2024-01-05 / not supplied.

{
  "product": "windows",
  "service": "security",
  "definition": "Requirements: Audit Filtering Platform Policy Change needs to be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 39046003c7721a9c089c8273772450b55b7bba73864609a768229ef708bab7fc

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: HackTool - NoFilter Execution
id: 7b14c76a-c602-4ae6-9717-eff868153fc0
status: test
description: |
    Detects execution of NoFilter, a tool for abusing the Windows Filtering Platform for privilege escalation via hardcoded policy name indicators
references:
    - https://github.com/deepinstinct/NoFilter/blob/121d215ab130c5e8e3ad45a7e7fcd56f4de97b4d/NoFilter/Consts.cpp
    - https://github.com/deepinstinct/NoFilter
    - https://www.deepinstinct.com/blog/nofilter-abusing-windows-filtering-platform-for-privilege-escalation
    - https://x.com/_st0pp3r_/status/1742203752361128162?s=20
author: Stamatis Chatzimangou (st0pp3r)
date: 2024-01-05
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1134
    - attack.t1134.001
logsource:
    product: windows
    service: security
    definition: 'Requirements: Audit Filtering Platform Policy Change needs to be enabled'
detection:
    selection_5447:
        EventID: 5447
        FilterName|contains: 'RonPolicy'
    selection_5449:
        EventID: 5449
        ProviderContextName|contains: 'RonPolicy'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/deepinstinct/NoFilter/blob/121d215ab130c5e8e3ad45a7e7fcd56f4de97b4d/NoFilter/Consts.cpp
• https://github.com/deepinstinct/NoFilter
• https://www.deepinstinct.com/blog/nofilter-abusing-windows-filtering-platform-for-privilege-escalation
• https://x.com/_st0pp3r_/status/1742203752361128162?s=20