{
  "$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/4f80ee8e-901f-538a-8603-cc4b49e80164')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4f80ee8e-901f-538a-8603-cc4b49e80164')]",
      "properties": {
        "alertRuleTemplateName": "4f80ee8e-901f-538a-8603-cc4b49e80164",
        "customDetails": {
          "ASNName": "asnName",
          "DomainAgeDays": "domainAge",
          "MaxThreatScore": "maxThreatScore",
          "ReputationScore": "reputationScore"
        },
        "description": "Identifies newly registered domains (under 7 days old) hosted on autonomous systems with elevated threat scores. This combination often indicates adversary infrastructure staging for phishing, malware delivery, or C2 operations.\n",
        "displayName": "Whisper Security - Newly Registered Domain on Threat ASN",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "DnsDomain",
                "identifier": "DomainName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "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/NewlyRegisteredDomainThreatASN.yaml",
        "query": "// MITRE ATT&CK: T1583.001 - Acquire Infrastructure: Domains\n// Tactic: Resource Development\n// Correlates newly registered domains with high-threat ASN reputation data\nlet maxDomainAgeDays = 7;\nlet asnThreatThreshold = 50;\n// Defensive: WhisperInfraChainPipeline currently emits domainAge=-1 as a\n// sentinel when the create date is unknown (tracked bug - proper fix needs\n// CALL whisper.history() integration). Filter the sentinel out so the rule\n// does not fire on every domain with an ASN.\nlet newDomains = WhisperInfraContext_CL\n    | where TimeGenerated > ago(1d)\n    | where domainAge >= 0 and domainAge < maxDomainAgeDays\n    | where isnotempty(asns)\n    | extend parsedAsn = tostring(split(asns, \",\")[0])\n    | extend parsedIp = tostring(split(ipAddresses, \",\")[0])\n    | project TimeGenerated, indicator, domainAge, parsedAsn, parsedIp, registrar, countries;\nlet threatAsns = WhisperASNReputation_CL\n    | where TimeGenerated > ago(1d)\n    | where maxThreatScore > asnThreatThreshold\n    | project asn, asnName, reputationScore, reputationLevel, maxThreatScore;\nnewDomains\n    | join kind=inner (threatAsns) on $left.parsedAsn == $right.asn\n    | extend DnsDomain = indicator, IPAddress = parsedIp\n    | project TimeGenerated, DnsDomain, IPAddress, domainAge, registrar, countries, asn, asnName, reputationScore, reputationLevel, maxThreatScore\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "ResourceDevelopment"
        ],
        "techniques": [
          "T1583"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}