Hayabusa medium test sigma

Diskshadow Script Mode - Uncommon Script Extension Execution

Detects execution of "Diskshadow.exe" in script mode to execute an script with a potentially uncommon extension. Initial baselining of the allowed extension list is required.

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Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection_img": [
    {
      "OriginalFileName": "diskshadow.exe"
    },
    {
      "Image
| endswith": "\\diskshadow.exe"
    }
  ],
  "selection_flag": {
    "CommandLine
| contains
| windash": "-s "
  },
  "filter_main_ext": {
    "CommandLine
| contains": ".txt"
  },
  "condition": "process_creation and (all of selection_* and not 1 of filter_main_*)"
}

False Positives

⚠ False postitve might occur with legitimate or uncommon extensions used internally. Initial baseline is required.

Field Validations

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