{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/b6e26c67-f596-5c0f-8614-c88d715508c5')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b6e26c67-f596-5c0f-8614-c88d715508c5')]",
      "properties": {
        "alertRuleTemplateName": "b6e26c67-f596-5c0f-8614-c88d715508c5",
        "customDetails": {
          "ChangeDate": "ChangeDate",
          "NewRegistrar": "NewRegistrar",
          "OldRegistrar": "OldRegistrar"
        },
        "description": "Detects domains whose registrar has changed across WHOIS history snapshots within the last 30 days. Registrar changes may indicate domain hijacking or adversary infrastructure acquisition.\n",
        "displayName": "Whisper Security - Domain Registrar Change Anomaly",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "DnsDomain",
                "identifier": "DomainName"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Whisper/Analytic%20Rules/DomainRegistrarChangeAnomaly.yaml",
        "query": "// MITRE ATT&CK: T1584 - Compromise Infrastructure\n// Tactic: Resource Development\n// Detects registrar changes across WHOIS history snapshots\nlet lookbackPeriod = 14d;\nWhisperHistory_CL\n    | where TimeGenerated > ago(lookbackPeriod)\n    | where indicatorType == \"domain\"\n    | where isnotempty(registrar)\n    | summarize Registrars = make_set(registrar), SnapshotCount = count(), EarliestSnapshot = min(snapshotDate), LatestSnapshot = max(snapshotDate) by indicator\n    | where array_length(Registrars) > 1\n    | mv-expand CurrentRegistrar = Registrars\n    | extend CurrentRegistrar = tostring(CurrentRegistrar)\n    | join kind=inner (\n        WhisperHistory_CL\n        | where TimeGenerated > ago(lookbackPeriod)\n        | where indicatorType == \"domain\"\n        | where isnotempty(registrar)\n        | serialize\n        | extend PreviousRegistrar = prev(registrar), PreviousIndicator = prev(indicator)\n        | where indicator == PreviousIndicator\n        | where registrar != PreviousRegistrar\n        | where isnotempty(PreviousRegistrar)\n        | project indicator, OldRegistrar = PreviousRegistrar, NewRegistrar = registrar, ChangeDate = snapshotDate\n    ) on indicator\n    | project TimeGenerated = ChangeDate, DnsDomain = indicator, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount\n    | distinct TimeGenerated, DnsDomain, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "ResourceDevelopment"
        ],
        "techniques": [
          "T1584"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}