Suspicious WFP Filter Added through Registry (via registry_set)

title: Suspicious WFP Filter Added through Registry (via registry_set)
id: 407c4d79-0373-52b8-8705-64b00f3338a4
status: stable
description: This rule 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://attack.mitre.org/techniques/T1569/002/
    - https://attack.mitre.org/techniques/T1685/
    - 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: Huntrule Team
date: 2026-03-05
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