Hayabusa high test sigma

Uncommon Extension In Keyboard Layout IME File Registry Value

Detects usage of Windows Input Method Editor (IME) keyboard layout feature, which allows an attacker to load a DLL into the process after sending the WM_INPUTLANGCHANGEREQUEST message. Before doing this, the client needs to register the DLL in a special registry key that is assumed to implement this keyboard layout. This registry key should store a value named "Ime File" with a DLL path. IMEs are essential for languages that have more characters than can be represented on a standard keyboard, such as Chinese, Japanese, and Korean.

View Source

Detection Logic

{
  "registry_set": {
    "EventID": 4657,
    "Channel": "Security"
  },
  "selection": {
    "ObjectName
| contains
| all": [
      "\\Control\\Keyboard Layouts\\",
      "Ime File"
    ]
  },
  "filter_main_known_extension": {
    "NewValue
| endswith": ".ime"
  },
  "condition": "registry_set and (selection and not 1 of filter_main_*)"
}

False Positives

⚠ IMEs are essential for languages that have more characters than can be represented on a standard keyboard, such as Chinese, Japanese, and Korean.

Field Validations

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