Hayabusa high test sigma

Potentially Suspicious Event Viewer Child Process

Detects uncommon or suspicious child processes of "eventvwr.exe" which might indicate a UAC bypass attempt

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Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "ParentImage
| endswith": "\\eventvwr.exe"
  },
  "filter_main_generic": {
    "Image
| endswith": [
      ":\\Windows\\System32\\mmc.exe",
      ":\\Windows\\System32\\WerFault.exe",
      ":\\Windows\\SysWOW64\\WerFault.exe"
    ]
  },
  "condition": "process_creation and (selection and not 1 of filter_main_*)"
}

False Positives

  • ⚠ Unknown

Field Validations

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