Hayabusa medium test sigma

Sysmon Configuration Update

Detects updates to Sysmon's configuration. Attackers might update or replace the Sysmon configuration with a bare bone one to avoid monitoring without shutting down the service completely

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Detection Logic

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection_pe": [
    {
      "Image
| endswith": [
        "\\Sysmon64.exe",
        "\\Sysmon64a.exe",
        "\\Sysmon.exe"
      ]
    },
    {
      "Description": "System activity monitor"
    }
  ],
  "selection_cli": {
    "CommandLine
| contains
| windash": "-c"
  },
  "condition": "process_creation and (all of selection_*)"
}

False Positives

  • ⚠ Legitimate administrators might use this command to update Sysmon configuration.

Field Validations

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