WFP blocked an application from listening.
Blocked backdoor listener attempts.
Alert: repeated block attempts from suspicious processes.
SubjectUserNameTargetUserNameLogonTypeIpAddressWorkstationName Starting points — adapt the log source, projected fields and thresholds for your environment.
SecurityEvent
| where EventID == 5155 // The Windows Filtering Platform has blocked an application from listening on a port
| project TimeGenerated, Computer, SubjectUserName, TargetUserName, LogonType, IpAddress, WorkstationName
| sort by TimeGenerated descindex=* sourcetype="WinEventLog:Security" EventCode=5155
| stats count earliest(_time) as first_seen latest(_time) as last_seen by ComputerName
| sort - count `# The Windows Filtering Platform has blocked an application from listening on a port — add EventData fields: SubjectUserName, TargetUserName, LogonType, IpAddress`The Windows Filtering Platform has blocked an application from listening on a port. WFP blocked an application from listening.
Event 5155 is written to the Security channel by Microsoft-Windows-Security-Auditing. Advanced Audit Policy — enable the 'Filtering Platform Connection' subcategory (Success and/or Failure).
Alert: repeated block attempts from suspicious processes.