Imperva - Multiple user agents from same source

let threshold = 10;
ImpervaWAFCloud
| summarize d_uas = dcount(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
| where d_uas >= threshold
| extend IPCustomEntity = SrcIpAddr

triggerOperator: gt
id: 4e8032eb-f04d-4a30-85d3-b74bf2c8f204
queryFrequency: 1h
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
requiredDataConnectors:
- dataTypes:
  - ImpervaWAFCloud
  connectorId: ImpervaWAFCloudAPI
severity: Medium
triggerThreshold: 0
kind: Scheduled
status: Available
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaMultipleUAsSource.yaml
query: |
  let threshold = 10;
  ImpervaWAFCloud
  | summarize d_uas = dcount(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
  | where d_uas >= threshold
  | extend IPCustomEntity = SrcIpAddr  
description: |
    ''Detects suspicious number of user agents from the same IP address.'
name: Imperva - Multiple user agents from same source
relevantTechniques:
- T1190
- T1133
tactics:
- InitialAccess
version: 1.0.0

{
  "$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/4e8032eb-f04d-4a30-85d3-b74bf2c8f204')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4e8032eb-f04d-4a30-85d3-b74bf2c8f204')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Imperva - Multiple user agents from same source",
        "description": "''Detects suspicious number of user agents from the same IP address.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let threshold = 10;\nImpervaWAFCloud\n| summarize d_uas = dcount(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)\n| where d_uas >= threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190",
          "T1133"
        ],
        "alertRuleTemplateName": "4e8032eb-f04d-4a30-85d3-b74bf2c8f204",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaMultipleUAsSource.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
    }
  ]
}