Hayabusa high test sigma

OneNote.EXE Execution of Malicious Embedded Scripts

Detects the execution of malicious OneNote documents that contain embedded scripts. When a user clicks on a OneNote attachment and then on the malicious link inside the ".one" file, it exports and executes the malicious embedded script from specific directories.

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Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "ParentImage
| endswith": "\\onenote.exe",
    "Image
| endswith": [
      "\\cmd.exe",
      "\\cscript.exe",
      "\\mshta.exe",
      "\\powershell.exe",
      "\\pwsh.exe",
      "\\wscript.exe"
    ],
    "CommandLine
| contains": [
      "\\exported\\",
      "\\onenoteofflinecache_files\\"
    ]
  },
  "condition": "process_creation and selection"
}

False Positives

  • ⚠ Unlikely

Field Validations

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