Trust Monitor Event

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Id	8dcf7238-a7d0-4cfd-8d0c-b230e3cd9182
Rulename	Trust Monitor Event
Description	This query identifies when a new trust monitor event is detected.
Severity	Medium
Tactics	CredentialAccess
Techniques	T1528 T1555
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/DuoSecurity/TrustMonitorEvent.yaml
Version	1.0.4
Arm template	8dcf7238-a7d0-4cfd-8d0c-b230e3cd9182.json

KQL

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])

YAML

relevantTechniques:
- T1528
- T1555
entityMappings:
- fieldMappings:
  - columnName: surfaced_auth_user_name_s
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: surfaced_auth_access_device_ip_s
    identifier: Address
  entityType: IP
triggerThreshold: 0
description: |
    'This query identifies when a new trust monitor event is detected.'
metadata:
  author:
    name: SecurityJedi
  source:
    kind: Community
  categories:
    domains:
    - Security - Others
  support:
    tier: Community
requiredDataConnectors: []
triggerOperator: gt
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/DuoSecurity/TrustMonitorEvent.yaml
id: 8dcf7238-a7d0-4cfd-8d0c-b230e3cd9182
queryFrequency: 5m
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])  
severity: Medium
queryPeriod: 5m
name: Trust Monitor Event
tactics:
- CredentialAccess
kind: Scheduled

ARM