Google DNS - CVE-2020-1350 (SIGRED) exploitation pattern

let threshold = 15;
GCPCloudDNS
| where QueryTypeName in~ ('SIG', 'RRSIG')
| where NetworkProtocol =~ 'TCP'
| summarize count() by SrcIpAddr, bin(TimeGenerated, 1m)
| where count_ < threshold
| extend IPCustomEntity = SrcIpAddr

triggerOperator: gt
version: 1.0.0
query: |
  let threshold = 15;
  GCPCloudDNS
  | where QueryTypeName in~ ('SIG', 'RRSIG')
  | where NetworkProtocol =~ 'TCP'
  | summarize count() by SrcIpAddr, bin(TimeGenerated, 1m)
  | where count_ < threshold
  | extend IPCustomEntity = SrcIpAddr  
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformDNS/Analytic Rules/GCPDNSSIGREDPattern.yaml
queryFrequency: 15m
requiredDataConnectors:
- connectorId: GCPDNSDataConnector
  dataTypes:
  - GCPCloudDNS
name: Google DNS - CVE-2020-1350 (SIGRED) exploitation pattern
queryPeriod: 15m
severity: High
kind: Scheduled
tactics:
- PrivilegeEscalation
id: 1267d53d-f5fd-418b-b8da-34453a5994c2
description: |
    'Detects exploitation pattern of CVE-2020-1350 (SIGRED) vulnerability.'
relevantTechniques:
- T1068
triggerThreshold: 0

{
  "$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/1267d53d-f5fd-418b-b8da-34453a5994c2')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/1267d53d-f5fd-418b-b8da-34453a5994c2')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Google DNS - CVE-2020-1350 (SIGRED) exploitation pattern",
        "description": "'Detects exploitation pattern of CVE-2020-1350 (SIGRED) vulnerability.'\n",
        "severity": "High",
        "enabled": true,
        "query": "let threshold = 15;\nGCPCloudDNS\n| where QueryTypeName in~ ('SIG', 'RRSIG')\n| where NetworkProtocol =~ 'TCP'\n| summarize count() by SrcIpAddr, bin(TimeGenerated, 1m)\n| where count_ < threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1068"
        ],
        "alertRuleTemplateName": "1267d53d-f5fd-418b-b8da-34453a5994c2",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformDNS/Analytic Rules/GCPDNSSIGREDPattern.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}