Hayabusa high test sigma

Suspicious File Created Via OneNote Application

Detects suspicious files created via the OneNote application. This could indicate a potential malicious ".one"/".onepkg" file was executed as seen being used in malware activity in the wild

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Detection Logic

{
  "file_event": {
    "EventID": 11,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "Image
| endswith": [
      "\\onenote.exe",
      "\\onenotem.exe",
      "\\onenoteim.exe"
    ],
    "TargetFilename
| contains": "\\AppData\\Local\\Temp\\OneNote\\",
    "TargetFilename
| endswith": [
      ".bat",
      ".chm",
      ".cmd",
      ".dll",
      ".exe",
      ".hta",
      ".htm",
      ".html",
      ".js",
      ".lnk",
      ".ps1",
      ".vbe",
      ".vbs",
      ".wsf"
    ]
  },
  "condition": "file_event and selection"
}

False Positives

  • ⚠ False positives should be very low with the extensions list cited. Especially if you don't heavily utilize OneNote.
  • ⚠ Occasional FPs might occur if OneNote is used internally to share different embedded documents

Field Validations

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