Cross-tenant Access Settings Organization Deleted

AuditLogs
| where OperationName has "Delete partner specific cross-tenant access setting"
| extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)
| extend InitiatedByIPAdress = InitiatedBy.user.ipAddress
| extend ExtTenantDeleted = TargetResources[0].modifiedProperties[0].oldValue

severity: Medium
triggerThreshold: 0
query: |
  AuditLogs
  | where OperationName has "Delete partner specific cross-tenant access setting"
  | extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)
  | extend InitiatedByIPAdress = InitiatedBy.user.ipAddress
  | extend ExtTenantDeleted = TargetResources[0].modifiedProperties[0].oldValue  
queryFrequency: 2d
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
id: eb8a9c1c-f532-4630-817c-1ecd8a60ed80
version: 1.0.0
name: Cross-tenant Access Settings Organization Deleted
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/Cross-tenantAccessSettingsOrganizationDeleted.yaml
queryPeriod: 2d
relevantTechniques:
- T1078.004
- T1136.003
- T1087.004
triggerOperator: gt
tactics:
- InitialAccess
- Persistence
- Discovery
description: |
    'Organizations are added in the Cross-tenant Access Settings to control communication inbound or outbound for users and applications. This detection notifies when an Organization is deleted from the Azure AD Cross-tenant Access Settings.'
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: ExtTenantDeleted
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: InitiatedByActionUserInformation
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: InitiatedByIPAdress

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/eb8a9c1c-f532-4630-817c-1ecd8a60ed80')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/eb8a9c1c-f532-4630-817c-1ecd8a60ed80')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Cross-tenant Access Settings Organization Deleted",
        "description": "'Organizations are added in the Cross-tenant Access Settings to control communication inbound or outbound for users and applications. This detection notifies when an Organization is deleted from the Azure AD Cross-tenant Access Settings.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AuditLogs\n| where OperationName has \"Delete partner specific cross-tenant access setting\"\n| extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)\n| extend InitiatedByIPAdress = InitiatedBy.user.ipAddress\n| extend ExtTenantDeleted = TargetResources[0].modifiedProperties[0].oldValue\n",
        "queryFrequency": "P2D",
        "queryPeriod": "P2D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess",
          "Persistence",
          "Discovery"
        ],
        "techniques": [
          "T1078.004",
          "T1136.003",
          "T1087.004"
        ],
        "alertRuleTemplateName": "eb8a9c1c-f532-4630-817c-1ecd8a60ed80",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "ExtTenantDeleted",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "InitiatedByActionUserInformation",
                "identifier": "Name"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "InitiatedByIPAdress",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/Cross-tenantAccessSettingsOrganizationDeleted.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
    }
  ]
}