WFP Filter Added via Registry — Sigma Rule

Rule metadata and linked tags

Author: Frack113. Source status: experimental; severity: medium. Source dates: 2025-10-23 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4da9b10d138f3f981cd22c38f462b8d489c53facc72805c91435f7461cc1af5a

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: WFP Filter Added via Registry
id: 1f1d8209-636e-4c6c-a137-781cca8b82f9
status: experimental
description: |
    Detects registry modifications that add Windows Filtering Platform (WFP) filters, which may be used to block security tools and EDR agents from reporting events.
references:
    - https://github.com/netero1010/EDRSilencer/blob/0e73a7037ec65c52894d8208e6f605a7da0a34a6/EDRSilencer.c
    - https://www.huntress.com/blog/silencing-the-edr-silencers
    - https://www.trendmicro.com/en_us/research/24/j/edrsilencer-disrupting-endpoint-security-solutions.html
author: Frack113
date: 2025-10-23
tags:
    - attack.execution
    - attack.defense-impairment
    - attack.t1685
    - attack.t1569.002
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\BFE\Parameters\Policy\Persistent\Filter\'
    filter_main_svchost:
        Image:
            - 'C:\Windows\System32\svchost.exe'
            - 'C:\Windows\SysWOW64\svchost.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/netero1010/EDRSilencer/blob/0e73a7037ec65c52894d8208e6f605a7da0a34a6/EDRSilencer.c
• https://www.huntress.com/blog/silencing-the-edr-silencers
• https://www.trendmicro.com/en_us/research/24/j/edrsilencer-disrupting-endpoint-security-solutions.html