Hayabusa high test sigma

Windows Filtering Platform Blocked Connection From EDR Agent Binary

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.

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Detection Logic

{
  "security": {
    "Channel": "Security"
  },
  "selection": {
    "EventID": 5157,
    "Application
| endswith": [
      "\\AmSvc.exe",
      "\\cb.exe",
      "\\CETASvc.exe",
      "\\CNTAoSMgr.exe",
      "\\CrAmTray.exe",
      "\\CrsSvc.exe",
      "\\CSFalconContainer.exe",
      "\\CSFalconService.exe",
      "\\CybereasonAV.exe",
      "\\CylanceSvc.exe",
      "\\cyserver.exe",
      "\\CyveraService.exe",
      "\\CyvrFsFlt.exe",
      "\\EIConnector.exe",
      "\\elastic-agent.exe",
      "\\elastic-endpoint.exe",
      "\\EndpointBasecamp.exe",
      "\\ExecutionPreventionSvc.exe",
      "\\filebeat.exe",
      "\\fortiedr.exe",
      "\\hmpalert.exe",
      "\\hurukai.exe",
      "\\LogProcessorService.exe",
      "\\mcsagent.exe",
      "\\mcsclient.exe",
      "\\MsMpEng.exe",
      "\\MsSense.exe",
      "\\Ntrtscan.exe",
      "\\PccNTMon.exe",
      "\\QualysAgent.exe",
      "\\RepMgr.exe",
      "\\RepUtils.exe",
      "\\RepUx.exe",
      "\\RepWAV.exe",
      "\\RepWSC.exe",
      "\\sedservice.exe",
      "\\SenseCncProxy.exe",
      "\\SenseIR.exe",
      "\\SenseNdr.exe",
      "\\SenseSampleUploader.exe",
      "\\SentinelAgent.exe",
      "\\SentinelAgentWorker.exe",
      "\\SentinelBrowserNativeHost.exe",
      "\\SentinelHelperService.exe",
      "\\SentinelServiceHost.exe",
      "\\SentinelStaticEngine.exe",
      "\\SentinelStaticEngineScanner.exe",
      "\\sfc.exe",
      "\\sophos ui.exe",
      "\\sophosfilescanner.exe",
      "\\sophosfs.exe",
      "\\sophoshealth.exe",
      "\\sophosips.exe",
      "\\sophosLivequeryservice.exe",
      "\\sophosnetfilter.exe",
      "\\sophosntpservice.exe",
      "\\sophososquery.exe",
      "\\sspservice.exe",
      "\\TaniumClient.exe",
      "\\TaniumCX.exe",
      "\\TaniumDetectEngine.exe",
      "\\TMBMSRV.exe",
      "\\TmCCSF.exe",
      "\\TmListen.exe",
      "\\TmWSCSvc.exe",
      "\\Traps.exe",
      "\\winlogbeat.exe",
      "\\WSCommunicator.exe",
      "\\xagt.exe"
    ]
  },
  "condition": "security and selection"
}

False Positives

  • Unlikely

Field Validations

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