Cisco WSA - Multiple errors to resource from risky category

let threshold = 10;
let risky_sites = dynamic(['IW_adlt', 'IW_hack', 'IW_porn']);
CiscoWSAEvent
| where DvcAction startswith 'BLOCK_'
| where UrlCategory in~ (risky_sites)
| summarize count() by SrcUserName, UrlOriginal, bin(TimeGenerated, 5m)
| where count_ >= threshold
| extend URLCustomEntity = UrlOriginal, AccountCustomEntity = SrcUserName

name: Cisco WSA - Multiple errors to resource from risky category
status: Available
triggerThreshold: 0
severity: Medium
tactics:
- InitialAccess
- CommandAndControl
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSAMultipleErrorsToUnwantedCategory.yaml
entityMappings:
- entityType: URL
  fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
queryPeriod: 1h
queryFrequency: 1h
version: 1.0.0
triggerOperator: gt
description: |
    'Detects multiple connection errors to resource from risky category.'
query: |
  let threshold = 10;
  let risky_sites = dynamic(['IW_adlt', 'IW_hack', 'IW_porn']);
  CiscoWSAEvent
  | where DvcAction startswith 'BLOCK_'
  | where UrlCategory in~ (risky_sites)
  | summarize count() by SrcUserName, UrlOriginal, bin(TimeGenerated, 5m)
  | where count_ >= threshold
  | extend URLCustomEntity = UrlOriginal, AccountCustomEntity = SrcUserName  
relevantTechniques:
- T1189
- T1102
id: ebf9db0c-ba7b-4249-b9ec-50a05fa7c7c9
requiredDataConnectors:
- dataTypes:
  - CiscoWSAEvent
  connectorId: CiscoWSA
kind: Scheduled

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/ebf9db0c-ba7b-4249-b9ec-50a05fa7c7c9')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ebf9db0c-ba7b-4249-b9ec-50a05fa7c7c9')]",
      "properties": {
        "alertRuleTemplateName": "ebf9db0c-ba7b-4249-b9ec-50a05fa7c7c9",
        "customDetails": null,
        "description": "'Detects multiple connection errors to resource from risky category.'\n",
        "displayName": "Cisco WSA - Multiple errors to resource from risky category",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "URLCustomEntity",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSAMultipleErrorsToUnwantedCategory.yaml",
        "query": "let threshold = 10;\nlet risky_sites = dynamic(['IW_adlt', 'IW_hack', 'IW_porn']);\nCiscoWSAEvent\n| where DvcAction startswith 'BLOCK_'\n| where UrlCategory in~ (risky_sites)\n| summarize count() by SrcUserName, UrlOriginal, bin(TimeGenerated, 5m)\n| where count_ >= threshold\n| extend URLCustomEntity = UrlOriginal, AccountCustomEntity = SrcUserName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl",
          "InitialAccess"
        ],
        "techniques": [
          "T1102",
          "T1189"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}