Sigma rule: HackTool - EDRSilencer Execution - Filter Added

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2d4bcee784db, updated 2024-01-30T00:00:00.000Z.

Rule

Title
HackTool - EDRSilencer Execution - Filter Added
Status
test
Level
high
Author
Thodoris Polyzos (@SmoothDeploy)
Date
2024-01-29
Modified
2024-01-30
File
rules/windows/builtin/security/win_security_hktl_edr_silencer.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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.

Log source

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

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.defense-impairment
  • attack.t1685

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_hktl_edr_silencer.yml

Sources and licences

  • SigmaHQ

    "HackTool - EDRSilencer Execution - Filter Added" by Thodoris Polyzos (@SmoothDeploy) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_hktl_edr_silencer.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: HackTool - EDRSilencer Execution - Filter Added",
entity page, dataset version ref-2d4bcee784db, updated 2024-01-30T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/98054878-5eab-434c-85d4-72d4e5a3361b (accessed 2026-11-03).
Underlying source: SigmaHQ rule 98054878-5eab-434c-85d4-72d4e5a3361b, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.