Valimail Enforce - High-Value User Management Event

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])

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountDomain
name: Valimail Enforce - High-Value User Management Event
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ValimailEnforce/Analytic%20Rules/ValimailEnforce_UserManagementHighValue.yaml
triggerOperator: gt
status: Available
queryPeriod: 1h
requiredDataConnectors:
- connectorId: ValimailEnforce
  dataTypes:
  - ValimailEnforceEvents_CL
tactics:
- Impact
- PrivilegeEscalation
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])
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
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: 1d
    groupByEntities:
    - Account
    enabled: true
    matchingMethod: Selected
    reopenClosedIncident: false
  createIncident: true
id: e960f5b0-cd80-474a-996a-013ff3989772
triggerThreshold: 0
queryFrequency: 1h
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}}
version: 1.0.0
relevantTechniques:
- T1531
- T1078

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/e960f5b0-cd80-474a-996a-013ff3989772')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e960f5b0-cd80-474a-996a-013ff3989772')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "User '{{User}}' performed {{EventCount}} high-value user management\naction(s) in Valimail Enforce. Actions: {{Actions}}\n",
          "alertDisplayNameFormat": "High-value user management action by {{User}}"
        },
        "alertRuleTemplateName": "e960f5b0-cd80-474a-996a-013ff3989772",
        "customDetails": null,
        "description": "This query searches for high-severity user management events such as user deletion or deactivation\nin Valimail Enforce, which may indicate unauthorized access or insider threat.\n",
        "displayName": "Valimail Enforce - High-Value User Management Event",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "UPNSuffix"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "groupByEntities": [
              "Account"
            ],
            "lookbackDuration": "P1D",
            "matchingMethod": "Selected",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ValimailEnforce/Analytic%20Rules/ValimailEnforce_UserManagementHighValue.yaml",
        "query": "ValimailEnforceEvents_CL\n| where EventCategory == \"UserManagement\"\n| where EventSeverity == \"High\"\n| where IsHighValueEvent == true\n| summarize\n    EventCount = count(),\n    FirstSeen = min(PerformedAt),\n    LastSeen = max(PerformedAt),\n    AffectedUsers = make_set(Subject),\n    Actions = make_set(EventType)\n  by User, EventCategory\n| extend\n    AccountName = tostring(split(User, \"@\")[0]),\n    AccountDomain = tostring(split(User, \"@\")[1])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078",
          "T1531"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}