Box - Item shared to external entity

BoxEvents
| where EventType =~ 'COLLABORATION_INVITE'
| extend corp_domain = tolower(extract(@'@(.*)', 1, SrcUserUpn))
| extend accessibleby_domain = tolower(extract(@'@(.*)', 1, AccessibleByLogin))
| where corp_domain != accessibleby_domain
| extend AccountCustomEntity = SrcUserUpn

relevantTechniques:
- T1537
name: Box - Item shared to external entity
requiredDataConnectors:
- dataTypes:
  - BoxEvents_CL
  connectorId: BoxDataConnector
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
triggerThreshold: 0
id: 3b803560-f8a6-4db4-89cb-617d89724ba1
tactics:
- Exfiltration
version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxItemSharedToExternalUser.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'Detects when an item was shared to external entity.'
query: |
  BoxEvents
  | where EventType =~ 'COLLABORATION_INVITE'
  | extend corp_domain = tolower(extract(@'@(.*)', 1, SrcUserUpn))
  | extend accessibleby_domain = tolower(extract(@'@(.*)', 1, AccessibleByLogin))
  | where corp_domain != accessibleby_domain
  | extend AccountCustomEntity = SrcUserUpn  
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/3b803560-f8a6-4db4-89cb-617d89724ba1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/3b803560-f8a6-4db4-89cb-617d89724ba1')]",
      "properties": {
        "alertRuleTemplateName": "3b803560-f8a6-4db4-89cb-617d89724ba1",
        "customDetails": null,
        "description": "'Detects when an item was shared to external entity.'\n",
        "displayName": "Box - Item shared to external entity",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxItemSharedToExternalUser.yaml",
        "query": "BoxEvents\n| where EventType =~ 'COLLABORATION_INVITE'\n| extend corp_domain = tolower(extract(@'@(.*)', 1, SrcUserUpn))\n| extend accessibleby_domain = tolower(extract(@'@(.*)', 1, AccessibleByLogin))\n| where corp_domain != accessibleby_domain\n| extend AccountCustomEntity = SrcUserUpn\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1537"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}