HackTool - EDRSilencer Execution - Filter Added — Sigma Rule

Rule metadata and linked tags

Author: Thodoris Polyzos (@SmoothDeploy). Source status: test; severity: high. Source dates: 2024-01-29 / 2024-01-30.

{
  "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: 074f2863af257d3a180dc49a7ba7297b5bcea686f4fb353b838fcb1187d86e7c

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 - EDRSilencer Execution - Filter Added
id: 98054878-5eab-434c-85d4-72d4e5a3361b
status: test
description: |
    Detects execution of EDRSilencer, a tool that abuses the Windows Filtering Platform (WFP) to block the outbound traffic of running EDR agents based on specific hardcoded filter names.
references:
    - https://github.com/netero1010/EDRSilencer
author: Thodoris Polyzos (@SmoothDeploy)
date: 2024-01-29
modified: 2024-01-30
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    service: security
    definition: 'Requirements: Audit Filtering Platform Policy Change needs to be enabled'
detection:
    selection:
        EventID:
            - 5441
            - 5447
        FilterName|contains: 'Custom Outbound Filter'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/netero1010/EDRSilencer