Valimail Enforce - Email Authentication Key Deleted

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

version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ValimailEnforce/Analytic%20Rules/ValimailEnforce_AuthKeyChanged.yaml
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - ValimailEnforceEvents_CL
  connectorId: ValimailEnforce
tactics:
- DefenseEvasion
relevantTechniques:
- T1562
kind: Scheduled
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: 1d
    matchingMethod: Selected
    enabled: true
    reopenClosedIncident: false
    groupByEntities:
    - Account
  createIncident: true
alertDetailsOverride:
  alertDescriptionFormat: |
    User '{{User}}' deleted one or more {{EventCategory}} records affecting
    domains: {{AffectedDomains}}. This may weaken email authentication posture.
  alertDisplayNameFormat: '{{EventCategory}} key deleted on {{EventCount}} domain(s) by {{User}}'
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountDomain
  entityType: Account
- fieldMappings:
  - identifier: DomainName
    columnName: DomainName
  entityType: DNS
description: |
  This query searches for deletion of SPF delegations or DKIM keys, which are medium-severity events
  that could degrade email authentication posture for a domain.
triggerOperator: gt
status: Available
queryFrequency: 1h
id: 483078c6-d029-40f3-931a-30af0032008b
name: Valimail Enforce - Email Authentication Key Deleted
severity: Medium
query: |
  ValimailEnforceEvents_CL
  | where EventSeverity == "Medium"
  | where EventCategory in ("SPFConfiguration", "DKIMConfiguration")
  | where IsHighValueEvent == true
  | summarize
      EventCount = count(),
      FirstSeen = min(PerformedAt),
      LastSeen = max(PerformedAt),
      AffectedDomains = make_set(Subject),
      Actions = make_set(EventType)
    by User, EventCategory
  | extend
      AccountName = tostring(split(User, "@")[0]),
      AccountDomain = tostring(split(User, "@")[1]),
      DomainName = tostring(AffectedDomains[0])
queryPeriod: 1h

{
  "$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/483078c6-d029-40f3-931a-30af0032008b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/483078c6-d029-40f3-931a-30af0032008b')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "User '{{User}}' deleted one or more {{EventCategory}} records affecting\ndomains: {{AffectedDomains}}. This may weaken email authentication posture.\n",
          "alertDisplayNameFormat": "{{EventCategory}} key deleted on {{EventCount}} domain(s) by {{User}}"
        },
        "alertRuleTemplateName": "483078c6-d029-40f3-931a-30af0032008b",
        "customDetails": null,
        "description": "This query searches for deletion of SPF delegations or DKIM keys, which are medium-severity events\nthat could degrade email authentication posture for a domain.\n",
        "displayName": "Valimail Enforce - Email Authentication Key Deleted",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "DomainName",
                "identifier": "DomainName"
              }
            ]
          }
        ],
        "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_AuthKeyChanged.yaml",
        "query": "ValimailEnforceEvents_CL\n| where EventSeverity == \"Medium\"\n| where EventCategory in (\"SPFConfiguration\", \"DKIMConfiguration\")\n| where IsHighValueEvent == true\n| summarize\n    EventCount = count(),\n    FirstSeen = min(PerformedAt),\n    LastSeen = max(PerformedAt),\n    AffectedDomains = 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    DomainName = tostring(AffectedDomains[0])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}