Windows Filtering Platform Blocked Connection From EDR Agent Binary — Sigma Rule

Rule metadata and linked tags

Author: @gott_cyber. Source status: test; severity: high. Source dates: 2024-01-08 / not supplied.

{
  "product": "windows",
  "service": "security",
  "definition": "Requirements: Audit Filtering Platform Connection needs to be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 387412af385f5ff488458a5365656cf6f4fe0a246647a4b7487c9cfdadd76270

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: Windows Filtering Platform Blocked Connection From EDR Agent Binary
id: bacf58c6-e199-4040-a94f-95dea0f1e45a
status: test
description: |
    Detects a Windows Filtering Platform (WFP) blocked connection event involving common Endpoint Detection and Response (EDR) agents.
    Adversaries may use WFP filters to prevent Endpoint Detection and Response (EDR) agents from reporting security events.
references:
    - https://github.com/netero1010/EDRSilencer
    - https://github.com/amjcyber/EDRNoiseMaker
    - https://ghoulsec.medium.com/misc-series-4-forensics-on-edrsilencer-events-428b20b3f983
author: '@gott_cyber'
date: 2024-01-08
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    service: security
    definition: 'Requirements: Audit Filtering Platform Connection needs to be enabled'
detection:
    selection:
        EventID: 5157
        Application|endswith:
            - '\AmSvc.exe' # Cybereason
            - '\cb.exe' # Carbon Black EDR
            - '\CETASvc.exe' # TrendMicro Apex One
            - '\CNTAoSMgr.exe' # TrendMicro Apex One
            - '\CrAmTray.exe' # Cybereason
            - '\CrsSvc.exe' # Cybereason
            - '\CSFalconContainer.exe' # CrowdStrike Falcon
            - '\CSFalconService.exe' # CrowdStrike Falcon
            - '\CybereasonAV.exe' # Cybereason
            - '\CylanceSvc.exe' # Cylance
            - '\cyserver.exe' # Palo Alto Networks Traps/Cortex XDR
            - '\CyveraService.exe' # Palo Alto Networks Traps/Cortex XDR
            - '\CyvrFsFlt.exe' # Palo Alto Networks Traps/Cortex XDR
            - '\EIConnector.exe' # ESET Inspect
            - '\elastic-agent.exe' # Elastic EDR
            - '\elastic-endpoint.exe' # Elastic EDR
            - '\EndpointBasecamp.exe' # TrendMicro Apex One
            - '\ExecutionPreventionSvc.exe' # Cybereason
            - '\filebeat.exe' # Elastic EDR
            - '\fortiedr.exe' # FortiEDR
            - '\hmpalert.exe' # Sophos EDR
            - '\hurukai.exe' # Harfanglab EDR
            - '\LogProcessorService.exe' # SentinelOne
            - '\mcsagent.exe' # Sophos EDR
            - '\mcsclient.exe' # Sophos EDR
            - '\MsMpEng.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\MsSense.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\Ntrtscan.exe' # TrendMicro Apex One
            - '\PccNTMon.exe' # TrendMicro Apex One
            - '\QualysAgent.exe' # Qualys EDR
            - '\RepMgr.exe' # Carbon Black Cloud
            - '\RepUtils.exe' # Carbon Black Cloud
            - '\RepUx.exe' # Carbon Black Cloud
            - '\RepWAV.exe' # Carbon Black Cloud
            - '\RepWSC.exe' # Carbon Black Cloud
            - '\sedservice.exe' # Sophos EDR
            - '\SenseCncProxy.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\SenseIR.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\SenseNdr.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\SenseSampleUploader.exe' # Microsoft Defender for Endpoint and Microsoft Defender Antivirus
            - '\SentinelAgent.exe' # SentinelOne
            - '\SentinelAgentWorker.exe' # SentinelOne
            - '\SentinelBrowserNativeHost.exe' # SentinelOne
            - '\SentinelHelperService.exe' # SentinelOne
            - '\SentinelServiceHost.exe' # SentinelOne
            - '\SentinelStaticEngine.exe' # SentinelOne
            - '\SentinelStaticEngineScanner.exe' # SentinelOne
            - '\sfc.exe' # Cisco Secure Endpoint (Formerly Cisco AMP)
            - '\sophos ui.exe' # Sophos EDR
            - '\sophosfilescanner.exe' # Sophos EDR
            - '\sophosfs.exe' # Sophos EDR
            - '\sophoshealth.exe' # Sophos EDR
            - '\sophosips.exe' # Sophos EDR
            - '\sophosLivequeryservice.exe' # Sophos EDR
            - '\sophosnetfilter.exe' # Sophos EDR
            - '\sophosntpservice.exe' # Sophos EDR
            - '\sophososquery.exe' # Sophos EDR
            - '\sspservice.exe' # Sophos EDR
            - '\TaniumClient.exe' # Tanium
            - '\TaniumCX.exe' # Tanium
            - '\TaniumDetectEngine.exe' # Tanium
            - '\TMBMSRV.exe' # TrendMicro Apex One
            - '\TmCCSF.exe' # TrendMicro Apex One
            - '\TmListen.exe' # TrendMicro Apex One
            - '\TmWSCSvc.exe' # TrendMicro Apex One
            - '\Traps.exe' # Palo Alto Networks Traps/Cortex XDR
            - '\winlogbeat.exe' # Elastic EDR
            - '\WSCommunicator.exe' # TrendMicro Apex One
            - '\xagt.exe' # Trellix EDR
    condition: selection
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://github.com/netero1010/EDRSilencer
• https://github.com/amjcyber/EDRNoiseMaker
• https://ghoulsec.medium.com/misc-series-4-forensics-on-edrsilencer-events-428b20b3f983