NGINX - Private IP address in URL

NGINXHTTPServer
| where UrlOriginal matches regex @'(10\.\d{1,3}\.\d{1,3}\.\d{1,3})|(172\.1[6-9]\.\d{1,3}\.\d{1,3})|(172\.2[0-9]\.\d{1,3}\.\d{1,3})|(172\.3[0-1]\.\d{1,3}\.\d{1,3})|(192\.168\.\d{1,3}\.\d{1,3})'
| extend UrlCustomEntity = UrlOriginal

severity: Medium
triggerThreshold: 0
query: |
  NGINXHTTPServer
  | where UrlOriginal matches regex @'(10\.\d{1,3}\.\d{1,3}\.\d{1,3})|(172\.1[6-9]\.\d{1,3}\.\d{1,3})|(172\.2[0-9]\.\d{1,3}\.\d{1,3})|(172\.3[0-1]\.\d{1,3}\.\d{1,3})|(192\.168\.\d{1,3}\.\d{1,3})'
  | extend UrlCustomEntity = UrlOriginal  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: NGINXHTTPServer
  dataTypes:
  - NGINXHTTPServer
id: 1aa6bfed-f11b-402f-9007-0dccc1152ede
version: 1.0.0
name: NGINX - Private IP address in URL
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXPrivateIPinUrl.yaml
queryPeriod: 1h
relevantTechniques:
- T1190
- T1133
triggerOperator: gt
tactics:
- InitialAccess
description: |
    'Detects requests to unusual URL'
entityMappings:
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity

{
  "$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/1aa6bfed-f11b-402f-9007-0dccc1152ede')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/1aa6bfed-f11b-402f-9007-0dccc1152ede')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "NGINX - Private IP address in URL",
        "description": "'Detects requests to unusual URL'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "NGINXHTTPServer\n| where UrlOriginal matches regex @'(10\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})|(172\\.1[6-9]\\.\\d{1,3}\\.\\d{1,3})|(172\\.2[0-9]\\.\\d{1,3}\\.\\d{1,3})|(172\\.3[0-1]\\.\\d{1,3}\\.\\d{1,3})|(192\\.168\\.\\d{1,3}\\.\\d{1,3})'\n| extend UrlCustomEntity = UrlOriginal\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190",
          "T1133"
        ],
        "alertRuleTemplateName": "1aa6bfed-f11b-402f-9007-0dccc1152ede",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "UrlCustomEntity",
                "identifier": "Url"
              }
            ],
            "entityType": "URL"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXPrivateIPinUrl.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
    }
  ]
}