API - Invalid host access

apifirewall_log_1_CL 
| where TimeGenerated >= ago(5m) 
| where Error_Step_s has "hostpath_mapping" 
| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g 
| sort by TimeGenerated desc 

relevantTechniques:
- T1592
name: API - Invalid host access
requiredDataConnectors:
- dataTypes:
  - apifirewall_log_1_CL
  connectorId: 42CrunchAPIProtection
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: Source_IP_s
  entityType: IP
- fieldMappings:
  - identifier: HostName
    columnName: Hostname_s
  entityType: Host
- fieldMappings:
  - identifier: FullName
    columnName: Instance_Name_s
  entityType: Account
triggerThreshold: 0
id: 28500be7-cfcf-40e1-bad4-bc524e9283e2
tactics:
- Reconnaissance
version: 1.0.1
customDetails: 
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIInvalidHostAccess.yaml
queryPeriod: 5m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: SingleAlert
queryFrequency: 5m
severity: Low
status: Available
description: |
    '42Crunch API protection against invalid host access'
query: |
  apifirewall_log_1_CL 
  | where TimeGenerated >= ago(5m) 
  | where Error_Step_s has "hostpath_mapping" 
  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g 
  | sort by TimeGenerated desc   
triggerOperator: gt

{
  "$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/28500be7-cfcf-40e1-bad4-bc524e9283e2')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/28500be7-cfcf-40e1-bad4-bc524e9283e2')]",
      "properties": {
        "alertRuleTemplateName": "28500be7-cfcf-40e1-bad4-bc524e9283e2",
        "customDetails": null,
        "description": "'42Crunch API protection against invalid host access'\n",
        "displayName": "API - Invalid host access",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "Source_IP_s",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Hostname_s",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Instance_Name_s",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIInvalidHostAccess.yaml",
        "query": "apifirewall_log_1_CL \n| where TimeGenerated >= ago(5m) \n| where Error_Step_s has \"hostpath_mapping\" \n| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g \n| sort by TimeGenerated desc \n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Reconnaissance"
        ],
        "techniques": [
          "T1592"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}