Hayabusa high test sigma

Uncommon FileSystem Load Attempt By Format.com

Detects the execution of format.com with an uncommon filesystem selection that could indicate a defense evasion activity in which "format.com" is used to load malicious DLL files or other programs.

View Source

Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "Image
| endswith": "\\format.com",
    "CommandLine
| contains": "/fs:"
  },
  "filter_main_known_fs": {
    "CommandLine
| contains": [
      "/fs:exFAT",
      "/fs:FAT",
      "/fs:NTFS",
      "/fs:ReFS",
      "/fs:UDF"
    ]
  },
  "condition": "process_creation and (selection and not 1 of filter_main_*)"
}

False Positives

  • ⚠ Unknown

Field Validations

Loading…

Comments (0)

Loading comments...