Infoblox - High Number of NXDOMAIN DNS Responses Detected

let threshold = 200;
InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
| summarize count() by SourceIP
| where count_ > threshold
| join kind=inner (InfobloxCDC
    | where DeviceEventClassID == "DNS Response"
    | where InfobloxDNSRCode == "NXDOMAIN"
    ) on SourceIP
| extend timestamp = TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName

version: 1.0.1
status: Available
queryFrequency: 1h
requiredDataConnectors:
- connectorId: InfobloxCloudDataConnector
  dataTypes:
  - CommonSecurityLog (InfobloxCDC)
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: HostCustomEntity
    identifier: HostName
  entityType: Host
kind: Scheduled
queryPeriod: 1h
severity: Medium
query: |
  let threshold = 200;
  InfobloxCDC
  | where DeviceEventClassID == "DNS Response"
  | where InfobloxDNSRCode == "NXDOMAIN"
  | summarize count() by SourceIP
  | where count_ > threshold
  | join kind=inner (InfobloxCDC
      | where DeviceEventClassID == "DNS Response"
      | where InfobloxDNSRCode == "NXDOMAIN"
      ) on SourceIP
  | extend timestamp = TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName  
triggerOperator: gt
id: 818eddaa-3806-43a2-8930-3defc5a06803
description: |
    'This creates an incident in the event a single host generates at least 200 DNS responses for non-existent domains in 1 hour. Query count threshold and scheduling is customizable. This rule depends on a parser based on a Kusto Function to work as expected called [**InfobloxCDC**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'
triggerThreshold: 0
name: Infoblox - High Number of NXDOMAIN DNS Responses Detected
relevantTechniques:
- T1498
- T1565
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-HighNumberOfNXDOMAINDNSResponsesDetected.yaml

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/818eddaa-3806-43a2-8930-3defc5a06803')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/818eddaa-3806-43a2-8930-3defc5a06803')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Infoblox - High Number of NXDOMAIN DNS Responses Detected",
        "description": "'This creates an incident in the event a single host generates at least 200 DNS responses for non-existent domains in 1 hour. Query count threshold and scheduling is customizable. This rule depends on a parser based on a Kusto Function to work as expected called [**InfobloxCDC**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let threshold = 200;\nInfobloxCDC\n| where DeviceEventClassID == \"DNS Response\"\n| where InfobloxDNSRCode == \"NXDOMAIN\"\n| summarize count() by SourceIP\n| where count_ > threshold\n| join kind=inner (InfobloxCDC\n    | where DeviceEventClassID == \"DNS Response\"\n    | where InfobloxDNSRCode == \"NXDOMAIN\"\n    ) on SourceIP\n| extend timestamp = TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1498",
          "T1565"
        ],
        "alertRuleTemplateName": "818eddaa-3806-43a2-8930-3defc5a06803",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "HostName",
                "columnName": "HostCustomEntity"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-HighNumberOfNXDOMAINDNSResponsesDetected.yaml",
        "templateVersion": "1.0.1"
      }
    }
  ]
}