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Detection rules › Sigma

WFP Filter Added via Registry

Status
experimental
Severity
medium
Log source
product windows, category registry_set
Author
Frack113
Source
github.com/SigmaHQ/sigma

Detects registry modifications that add Windows Filtering Platform (WFP) filters, which may be used to block security tools and EDR agents from reporting events.

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1569.002 System Services: Service Execution
Defense ImpairmentT1685 Disable or Modify Tools

Event coverage

ProviderEventTitle
SysmonEvent ID 13RegistryEvent (Value Set)

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection and not 1 of filter_main_*

Stage 1: selection

selection:
    TargetObject|contains: '\BFE\Parameters\Policy\Persistent\Filter\'

Stage 2: not filter_main_svchost

filter_main_svchost:
    Image:
        - 'C:\Windows\System32\svchost.exe'
        - 'C:\Windows\SysWOW64\svchost.exe'

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

FieldKindExcluded values
ImageeqC:\Windows\SysWOW64\svchost.exe
ImageeqC:\Windows\System32\svchost.exe

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
TargetObjectmatch
  • \BFE\Parameters\Policy\Persistent\Filter\