Whisper Security - Domain Registrar Change Anomaly

// MITRE ATT&CK: T1584 - Compromise Infrastructure
// Tactic: Resource Development
// Detects registrar changes across WHOIS history snapshots
let lookbackPeriod = 14d;
WhisperHistory_CL
    | where TimeGenerated > ago(lookbackPeriod)
    | where indicatorType == "domain"
    | where isnotempty(registrar)
    | summarize Registrars = make_set(registrar), SnapshotCount = count(), EarliestSnapshot = min(snapshotDate), LatestSnapshot = max(snapshotDate) by indicator
    | where array_length(Registrars) > 1
    | mv-expand CurrentRegistrar = Registrars
    | extend CurrentRegistrar = tostring(CurrentRegistrar)
    | join kind=inner (
        WhisperHistory_CL
        | where TimeGenerated > ago(lookbackPeriod)
        | where indicatorType == "domain"
        | where isnotempty(registrar)
        | serialize
        | extend PreviousRegistrar = prev(registrar), PreviousIndicator = prev(indicator)
        | where indicator == PreviousIndicator
        | where registrar != PreviousRegistrar
        | where isnotempty(PreviousRegistrar)
        | project indicator, OldRegistrar = PreviousRegistrar, NewRegistrar = registrar, ChangeDate = snapshotDate
    ) on indicator
    | project TimeGenerated = ChangeDate, DnsDomain = indicator, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount
    | distinct TimeGenerated, DnsDomain, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount

incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: true
  createIncident: true
name: Whisper Security - Domain Registrar Change Anomaly
triggerOperator: gt
query: |
  // MITRE ATT&CK: T1584 - Compromise Infrastructure
  // Tactic: Resource Development
  // Detects registrar changes across WHOIS history snapshots
  let lookbackPeriod = 14d;
  WhisperHistory_CL
      | where TimeGenerated > ago(lookbackPeriod)
      | where indicatorType == "domain"
      | where isnotempty(registrar)
      | summarize Registrars = make_set(registrar), SnapshotCount = count(), EarliestSnapshot = min(snapshotDate), LatestSnapshot = max(snapshotDate) by indicator
      | where array_length(Registrars) > 1
      | mv-expand CurrentRegistrar = Registrars
      | extend CurrentRegistrar = tostring(CurrentRegistrar)
      | join kind=inner (
          WhisperHistory_CL
          | where TimeGenerated > ago(lookbackPeriod)
          | where indicatorType == "domain"
          | where isnotempty(registrar)
          | serialize
          | extend PreviousRegistrar = prev(registrar), PreviousIndicator = prev(indicator)
          | where indicator == PreviousIndicator
          | where registrar != PreviousRegistrar
          | where isnotempty(PreviousRegistrar)
          | project indicator, OldRegistrar = PreviousRegistrar, NewRegistrar = registrar, ChangeDate = snapshotDate
      ) on indicator
      | project TimeGenerated = ChangeDate, DnsDomain = indicator, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount
      | distinct TimeGenerated, DnsDomain, OldRegistrar, NewRegistrar, ChangeDate, SnapshotCount
queryFrequency: 1h
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.
id: b6e26c67-f596-5c0f-8614-c88d715508c5
triggerThreshold: 0
queryPeriod: 14d
version: 1.0.0
kind: Scheduled
customDetails:
  ChangeDate: ChangeDate
  OldRegistrar: OldRegistrar
  NewRegistrar: NewRegistrar
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: WhisperSecurityConnector
  dataTypes:
  - WhisperHistory_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Whisper/Analytic%20Rules/DomainRegistrarChangeAnomaly.yaml
relevantTechniques:
- T1584
tactics:
- ResourceDevelopment
entityMappings:
- fieldMappings:
  - identifier: DomainName
    columnName: DnsDomain
  entityType: DNS

{
  "$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"
    }
  ]
}