Hayabusa medium test sigma

TeamViewer Domain Query By Non-TeamViewer Application

Detects DNS queries to a TeamViewer domain only resolved by a TeamViewer client by an image that isn't named TeamViewer (sometimes used by threat actors for obfuscation)

View Source

Detection Logic

{
  "dns_query": {
    "EventID": 22,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection": {
    "QueryName": [
      "taf.teamviewer.com",
      "udp.ping.teamviewer.com"
    ]
  },
  "filter_main_teamviewer": {
    "Image
| contains": "TeamViewer"
  },
  "condition": "dns_query and (selection and not 1 of filter_main_*)"
}

False Positives

⚠ Unknown binary names of TeamViewer
⚠ Depending on the environment the rule might require some initial tuning before usage to avoid FP with third party applications

Field Validations

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