Azure Active Directory Hybrid Health AD FS Service Delete

AzureActivity
| where CategoryValue =~ 'Administrative'
| where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'
| where _ResourceId has 'AdFederationService'
| where OperationNameValue =~ 'Microsoft.ADHybridHealthService/services/delete'
| extend claimsJson = parse_json(Claims)
| extend AppId = tostring(claimsJson.appid), AccountName = tostring(claimsJson.name), Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])
| project-away claimsJson

severity: Medium
queryFrequency: 1d
relevantTechniques:
- T1578.003
tactics:
- DefenseEvasion
kind: Scheduled
query: |
  AzureActivity
  | where CategoryValue =~ 'Administrative'
  | where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'
  | where _ResourceId has 'AdFederationService'
  | where OperationNameValue =~ 'Microsoft.ADHybridHealthService/services/delete'
  | extend claimsJson = parse_json(Claims)
  | extend AppId = tostring(claimsJson.appid), AccountName = tostring(claimsJson.name), Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])
  | project-away claimsJson  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/AADHybridHealthADFSServiceDelete.yaml
queryPeriod: 1d
status: Available
version: 2.0.1
tags:
- SimuLand
name: Azure Active Directory Hybrid Health AD FS Service Delete
requiredDataConnectors:
- dataTypes:
  - AzureActivity
  connectorId: AzureActivity
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: CallerIpAddress
id: 86a036b2-3686-42eb-b417-909fc0867771
description: |
  'This detection uses AzureActivity logs (Administrative category) to identify the deletion of an Azure AD Hybrid Health AD FS service instance in a tenant.
  A threat actor can create a new AD Health ADFS service and create a fake server to spoof AD FS signing logs.
  The health AD FS service can then be deleted after it is no longer needed via HTTP requests to Azure.
  More information is available in this blog https://o365blog.com/post/hybridhealthagent/'  
triggerThreshold: 0

{
  "$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/86a036b2-3686-42eb-b417-909fc0867771')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/86a036b2-3686-42eb-b417-909fc0867771')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Azure Active Directory Hybrid Health AD FS Service Delete",
        "description": "'This detection uses AzureActivity logs (Administrative category) to identify the deletion of an Azure AD Hybrid Health AD FS service instance in a tenant.\nA threat actor can create a new AD Health ADFS service and create a fake server to spoof AD FS signing logs.\nThe health AD FS service can then be deleted after it is no longer needed via HTTP requests to Azure.\nMore information is available in this blog https://o365blog.com/post/hybridhealthagent/'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AzureActivity\n| where CategoryValue =~ 'Administrative'\n| where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'\n| where _ResourceId has 'AdFederationService'\n| where OperationNameValue =~ 'Microsoft.ADHybridHealthService/services/delete'\n| extend claimsJson = parse_json(Claims)\n| extend AppId = tostring(claimsJson.appid), AccountName = tostring(claimsJson.name), Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])\n| project-away claimsJson\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1578.003"
        ],
        "alertRuleTemplateName": "86a036b2-3686-42eb-b417-909fc0867771",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "CallerIpAddress",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "tags": [
          "SimuLand"
        ],
        "status": "Available",
        "templateVersion": "2.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/AADHybridHealthADFSServiceDelete.yaml"
      }
    }
  ]
}