Box - Item shared to external entity

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Id	3b803560-f8a6-4db4-89cb-617d89724ba1
Rulename	Box - Item shared to external entity
Description	Detects when an item was shared to external entity.
Severity	Medium
Tactics	Exfiltration
Techniques	T1537
Required data connectors	BoxDataConnector
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxItemSharedToExternalUser.yaml
Version	1.0.0
Arm template	3b803560-f8a6-4db4-89cb-617d89724ba1.json

KQL

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

YAML

queryFrequency: 1h
kind: Scheduled
version: 1.0.0
relevantTechniques:
- T1537
triggerOperator: gt
status: Available
requiredDataConnectors:
- connectorId: BoxDataConnector
  dataTypes:
  - BoxEvents_CL
id: 3b803560-f8a6-4db4-89cb-617d89724ba1
name: Box - Item 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  
queryPeriod: 1h
triggerThreshold: 0
description: |
    'Detects when an item was shared to external entity.'
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
severity: Medium
tactics:
- Exfiltration
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Box/Analytic Rules/BoxItemSharedToExternalUser.yaml

ARM