Valimail Enforce - High-Value User Management Event

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Id	e960f5b0-cd80-474a-996a-013ff3989772
Rulename	Valimail Enforce - High-Value User Management Event
Description	This query searches for high-severity user management events such as user deletion or deactivation in Valimail Enforce, which may indicate unauthorized access or insider threat.
Severity	High
Tactics	Impact PrivilegeEscalation
Techniques	T1531 T1078
Required data connectors	ValimailEnforce
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/ValimailEnforce/Analytic Rules/ValimailEnforce_UserManagementHighValue.yaml
Version	1.0.0
Arm template	e960f5b0-cd80-474a-996a-013ff3989772.json

KQL

ValimailEnforceEvents_CL
| where EventCategory == "UserManagement"
| where EventSeverity == "High"
| where IsHighValueEvent == true
| summarize
    EventCount = count(),
    FirstSeen = min(PerformedAt),
    LastSeen = max(PerformedAt),
    AffectedUsers = make_set(Subject),
    Actions = make_set(EventType)
  by User, EventCategory
| extend
    AccountName = tostring(split(User, "@")[0]),
    AccountDomain = tostring(split(User, "@")[1])

YAML

relevantTechniques:
- T1531
- T1078
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountDomain
    identifier: UPNSuffix
version: 1.0.0
id: e960f5b0-cd80-474a-996a-013ff3989772
severity: High
kind: Scheduled
queryFrequency: 1h
description: |
  This query searches for high-severity user management events such as user deletion or deactivation
  in Valimail Enforce, which may indicate unauthorized access or insider threat.  
requiredDataConnectors:
- connectorId: ValimailEnforce
  dataTypes:
  - ValimailEnforceEvents_CL
triggerOperator: gt
name: Valimail Enforce - High-Value User Management Event
tactics:
- Impact
- PrivilegeEscalation
alertDetailsOverride:
  alertDescriptionFormat: |
    User '{{User}}' performed {{EventCount}} high-value user management
    action(s) in Valimail Enforce. Actions: {{Actions}}    
  alertDisplayNameFormat: High-value user management action by {{User}}
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ValimailEnforce/Analytic Rules/ValimailEnforce_UserManagementHighValue.yaml
triggerThreshold: 0
queryPeriod: 1h
query: |
  ValimailEnforceEvents_CL
  | where EventCategory == "UserManagement"
  | where EventSeverity == "High"
  | where IsHighValueEvent == true
  | summarize
      EventCount = count(),
      FirstSeen = min(PerformedAt),
      LastSeen = max(PerformedAt),
      AffectedUsers = make_set(Subject),
      Actions = make_set(EventType)
    by User, EventCategory
  | extend
      AccountName = tostring(split(User, "@")[0]),
      AccountDomain = tostring(split(User, "@")[1])  
status: Available
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: Selected
    groupByEntities:
    - Account
    reopenClosedIncident: false
    enabled: true
    lookbackDuration: 1d

ARM