Detection rules › Kusto
Trust Monitor Event
'This query identifies when a new trust monitor event is detected.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access |
Rule body
id: 8dcf7238-a7d0-4cfd-8d0c-b230e3cd9182
name: Trust Monitor Event
description: |
'This query identifies when a new trust monitor event is detected.'
severity: Medium
requiredDataConnectors: []
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
relevantTechniques:
- T1528
- T1555
query: |
let timeframe = ago(5m);
DuoSecurityTrustMonitor_CL
| where TimeGenerated >= timeframe
| extend AccountName = tostring(split(surfaced_auth_user_name_s, "@")[0]), AccountUPNSuffix = tostring(split(surfaced_auth_user_name_s, "@")[1])
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: surfaced_auth_user_name_s
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
- entityType: IP
fieldMappings:
- identifier: Address
columnName: surfaced_auth_access_device_ip_s
version: 1.0.4
kind: Scheduled
metadata:
source:
kind: Community
author:
name: SecurityJedi
support:
tier: Community
categories:
domains: [ "Security - Others" ]
Stages and Predicates
Parameters
let timeframe = ago(5m);
Stage 1: source
DuoSecurityTrustMonitor_CL
Stage 2: where
| where TimeGenerated >= timeframe
Stage 3: extend
| extend AccountName = tostring(split(surfaced_auth_user_name_s, "@")[0]), AccountUPNSuffix = tostring(split(surfaced_auth_user_name_s, "@")[1])
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
TimeGenerated | cross_field_compare |
| field:"TimeGenerated" kind:cross_field_compare value:"timeframe" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
AccountName | extend |
AccountUPNSuffix | extend |