Box - Forbidden file type downloaded

let forbidden_files = dynamic(['ps1', 'bat', 'scr', 'sh']);
BoxEvents
| where EventType =~ 'DOWNLOAD'
| extend file_type = extract(@'\.(\w+)$', 1, SourceItemName)
| where file_type in (forbidden_files)
| extend AccountCustomEntity = SrcUserName
| extend IPCustomEntity = SrcIpAddr

description: |
    'Detects when new user downloads forbidden file types.'
status: Available
queryPeriod: 1h
severity: Medium
triggerOperator: gt
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1189
version: 1.0.0
name: Box - Forbidden file type downloaded
queryFrequency: 1h
id: 8889e69c-2161-412a-94a6-76c1b2d9daa7
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxDownloadForbiddenFiles.yaml
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
tactics:
- InitialAccess
requiredDataConnectors:
- dataTypes:
  - BoxEvents_CL
  connectorId: BoxDataConnector
query: |
  let forbidden_files = dynamic(['ps1', 'bat', 'scr', 'sh']);
  BoxEvents
  | where EventType =~ 'DOWNLOAD'
  | extend file_type = extract(@'\.(\w+)$', 1, SourceItemName)
  | where file_type in (forbidden_files)
  | extend AccountCustomEntity = SrcUserName
  | extend IPCustomEntity = SrcIpAddr  

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/8889e69c-2161-412a-94a6-76c1b2d9daa7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8889e69c-2161-412a-94a6-76c1b2d9daa7')]",
      "properties": {
        "alertRuleTemplateName": "8889e69c-2161-412a-94a6-76c1b2d9daa7",
        "customDetails": null,
        "description": "'Detects when new user downloads forbidden file types.'\n",
        "displayName": "Box - Forbidden file type downloaded",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxDownloadForbiddenFiles.yaml",
        "query": "let forbidden_files = dynamic(['ps1', 'bat', 'scr', 'sh']);\nBoxEvents\n| where EventType =~ 'DOWNLOAD'\n| extend file_type = extract(@'\\.(\\w+)$', 1, SourceItemName)\n| where file_type in (forbidden_files)\n| extend AccountCustomEntity = SrcUserName\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1189"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}