Detection rules › Kusto
Box - New external user
'Detects when new user created with SourceLogin containing non-corporate domain.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Persistence |
Rule body
id: fd36ac88-cd92-4137-aa23-37a3648621fa
name: Box - New external user
description: |
'Detects when new user created with SourceLogin containing non-corporate domain.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: BoxDataConnector
dataTypes:
- BoxEvents_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
- Persistence
relevantTechniques:
- T1078
query: |
BoxEvents
| where EventType =~ 'NEW_USER'
| extend corp_domain = extract(@'@(.*)', 1, SourceLogin)
| extend new_domain = tolower(extract(@'@(.*)', 1, SourceLogin))
| where corp_domain != new_domain
| extend AccountCustomEntity = SourceLogin
| extend IPCustomEntity = SrcIpAddr
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.0
kind: Scheduled
Stages and Predicates
Stage 1: source
BoxEvents
Stage 2: where
| where EventType =~ 'NEW_USER'
Stage 3: extend
| extend corp_domain = extract(@'@(.*)', 1, SourceLogin)
Stage 4: extend
| extend new_domain = tolower(extract(@'@(.*)', 1, SourceLogin))
Stage 5: where
| where corp_domain != new_domain
Stage 6: extend
| extend AccountCustomEntity = SourceLogin
Stage 7: extend
| extend IPCustomEntity = SrcIpAddr
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventType | eq |
| field:"EventType" kind:eq value:"NEW_USER" |
corp_domain | cross_field_compare |
| field:"corp_domain" kind:cross_field_compare value:"new_domain" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
corp_domain | extend |
new_domain | extend |
AccountCustomEntity | extend |
IPCustomEntity | extend |