Detection rules › Kusto
Box - Item shared to external entity
'Detects when an item was shared to external entity.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Exfiltration |
Rule body
id: 3b803560-f8a6-4db4-89cb-617d89724ba1
name: Box - Item shared to external entity
description: |
'Detects when an item was shared to external entity.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: BoxDataConnector
dataTypes:
- BoxEvents_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Exfiltration
relevantTechniques:
- T1537
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
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
version: 1.0.0
kind: Scheduled
Stages and Predicates
Stage 1: source
BoxEvents
Stage 2: where
| where EventType =~ 'COLLABORATION_INVITE'
Stage 3: extend
| extend corp_domain = tolower(extract(@'@(.*)', 1, SrcUserUpn))
Stage 4: extend
| extend accessibleby_domain = tolower(extract(@'@(.*)', 1, AccessibleByLogin))
Stage 5: where
| where corp_domain != accessibleby_domain
Stage 6: extend
| extend AccountCustomEntity = SrcUserUpn
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventType | eq |
| field:"EventType" kind:eq value:"COLLABORATION_INVITE" |
corp_domain | cross_field_compare |
| field:"corp_domain" kind:cross_field_compare value:"accessibleby_domain" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
corp_domain | extend |
accessibleby_domain | extend |
AccountCustomEntity | extend |