Hayabusa high test sigma

Powershell DNSExfiltration

DNSExfiltrator allows for transferring (exfiltrate) a file over a DNS request covert channel

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Detection Logic

{
  "ps_script": {
    "EventID": 4104,
    "Channel": [
      "Microsoft-Windows-PowerShell/Operational",
      "PowerShellCore/Operational"
    ]
  },
  "selection_cmdlet": [
    {
      "ScriptBlockText
| contains": "Invoke-DNSExfiltrator"
    },
    {
      "ScriptBlockText
| contains
| all": [
        " -i ",
        " -d ",
        " -p ",
        " -doh ",
        " -t "
      ]
    }
  ],
  "condition": "ps_script and selection_cmdlet"
}

False Positives

  • ⚠ Legitimate script

Field Validations

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