Hayabusa medium test sigma

Rundll32 InstallScreenSaver Execution

An attacker may execute an application as a SCR File using rundll32.exe desk.cpl,InstallScreenSaver

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Detection Logic

{
  "process_creation": {
    "EventID": 4688,
    "Channel": "Security"
  },
  "selection_img": [
    {
      "NewProcessName
| endswith": "\\rundll32.exe"
    },
    {
      "OriginalFileName": "RUNDLL32.EXE"
    }
  ],
  "selection_cli": {
    "CommandLine
| contains": "InstallScreenSaver"
  },
  "condition": "process_creation and (all of selection_*)"
}

False Positives

  • ⚠ Legitimate installation of a new screensaver

Field Validations

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