Hayabusa high test sigma

Suspicious Processes Spawned by WinRM

Detects suspicious processes including shells spawnd from WinRM host process

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Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "ParentImage
| endswith": "\\wsmprovhost.exe",
    "Image
| endswith": [
      "\\cmd.exe",
      "\\sh.exe",
      "\\bash.exe",
      "\\powershell.exe",
      "\\pwsh.exe",
      "\\wsl.exe",
      "\\schtasks.exe",
      "\\certutil.exe",
      "\\whoami.exe",
      "\\bitsadmin.exe"
    ]
  },
  "condition": "process_creation and selection"
}

False Positives

  • ⚠ Legitimate WinRM usage

Field Validations

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