Hayabusa high test sigma

Dllhost.EXE Execution Anomaly

Detects a "dllhost" process spawning with no commandline arguments which is very rare to happen and could indicate process injection activity or malware mimicking similar system processes.

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Detection Logic

{
  "process_creation": {
    "EventID": 4688,
    "Channel": "Security"
  },
  "selection": {
    "CommandLine": [
      "dllhost.exe",
      "dllhost"
    ],
    "NewProcessName
| endswith": "\\dllhost.exe"
  },
  "filter_main_null": {
    "CommandLine": null
  },
  "condition": "process_creation and (selection and not 1 of filter_main_*)"
}

False Positives

  • ⚠ Unlikely

Field Validations

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