Hayabusa medium test sigma

Network Connection Initiated To DevTunnels Domain

Detects network connections to Devtunnels domains initiated by a process on a system. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.

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Detection Logic

{
  "network_connection": {
    "EventID": 3,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "Initiated": "true",
    "DestinationHostname
| endswith": ".devtunnels.ms"
  },
  "condition": "network_connection and selection"
}

False Positives

⚠ Legitimate use of Devtunnels will also trigger this.

Field Validations

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