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
| mv-apply TargetResource = TargetResources on
  (
      where TargetResource.type =~ "Policy"
      | extend Properties = TargetResource.modifiedProperties
  )
| mv-apply Property = Properties on
  (
      where Property.displayName =~ "tenantId"
      | extend ExtTenantDeleted = trim('"',tostring(Property.oldValue))
  )
| extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])

severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/Cross-tenantAccessSettingsOrganizationDeleted.yaml
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.'
triggerOperator: gt
queryPeriod: 2d
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
queryFrequency: 2d
triggerThreshold: 0
tactics:
- InitialAccess
- Persistence
- Discovery
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
  | mv-apply TargetResource = TargetResources on
    (
        where TargetResource.type =~ "Policy"
        | extend Properties = TargetResource.modifiedProperties
    )
  | mv-apply Property = Properties on
    (
        where Property.displayName =~ "tenantId"
        | extend ExtTenantDeleted = trim('"',tostring(Property.oldValue))
    )
  | extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])  
status: Available
kind: Scheduled
relevantTechniques:
- T1078.004
- T1136.003
- T1087.004
version: 1.0.1
id: eb8a9c1c-f532-4630-817c-1ecd8a60ed80
entityMappings:
- fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: InitiatedByIPAdress
    identifier: Address
  entityType: IP
name: Cross-tenant Access Settings Organization Deleted

{
  "$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-preview",
      "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| mv-apply TargetResource = TargetResources on\n  (\n      where TargetResource.type =~ \"Policy\"\n      | extend Properties = TargetResource.modifiedProperties\n  )\n| mv-apply Property = Properties on\n  (\n      where Property.displayName =~ \"tenantId\"\n      | extend ExtTenantDeleted = trim('\"',tostring(Property.oldValue))\n  )\n| extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])\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": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "InitiatedByIPAdress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/Cross-tenantAccessSettingsOrganizationDeleted.yaml"
      }
    }
  ]
}