Digital Guardian - Exfiltration using DNS protocol

DigitalGuardianDLPEvent
| where DstPortNumber == 53
| extend AccountCustomEntity = SrcUserName

tactics:
- Exfiltration
relevantTechniques:
- T1048
id: 39e25deb-49bb-4cdb-89c1-c466d596e2bd
severity: High
status: Available
name: Digital Guardian - Exfiltration using DNS protocol
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
query: |
  DigitalGuardianDLPEvent
  | where DstPortNumber == 53
  | extend AccountCustomEntity = SrcUserName  
queryPeriod: 1h
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
triggerOperator: gt
triggerThreshold: 0
description: |
    'Detects exfiltration using DNS protocol.'
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianExfiltrationOverDNS.yaml
queryFrequency: 1h
kind: Scheduled

{
  "$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/39e25deb-49bb-4cdb-89c1-c466d596e2bd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/39e25deb-49bb-4cdb-89c1-c466d596e2bd')]",
      "properties": {
        "alertRuleTemplateName": "39e25deb-49bb-4cdb-89c1-c466d596e2bd",
        "customDetails": null,
        "description": "'Detects exfiltration using DNS protocol.'\n",
        "displayName": "Digital Guardian - Exfiltration using DNS protocol",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Digital Guardian Data Loss Prevention/Analytic Rules/DigitalGuardianExfiltrationOverDNS.yaml",
        "query": "DigitalGuardianDLPEvent\n| where DstPortNumber == 53\n| extend AccountCustomEntity = SrcUserName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1048"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}