Microsoft Entra ID Hybrid Health AD FS Suspicious Application

// Microsoft Entra ID Connect Health Agent - cf6d7e68-f018-4e0a-a7b3-126e053fb88d
// Microsoft Entra ID Connect - cb1056e2-e479-49de-ae31-7812af012ed8
let appList = dynamic(['cf6d7e68-f018-4e0a-a7b3-126e053fb88d','cb1056e2-e479-49de-ae31-7812af012ed8']);
let operationNamesList = dynamic(['Microsoft.ADHybridHealthService/services/servicemembers/action','Microsoft.ADHybridHealthService/services/delete']);
AzureActivity
| where CategoryValue =~ 'Administrative'
| where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'
| where _ResourceId has 'AdFederationService'
| where OperationNameValue in~ (operationNamesList)
| 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])
| where AppId !in (appList)
| project-away claimsJson

status: Available
triggerOperator: gt
triggerThreshold: 0
name: Microsoft Entra ID Hybrid Health AD FS Suspicious Application
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/AADHybridHealthADFSSuspApp.yaml
queryPeriod: 1d
severity: Medium
tags:
- SimuLand
kind: Scheduled
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Caller
    identifier: FullName
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: CallerIpAddress
    identifier: Address
queryFrequency: 1d
relevantTechniques:
- T1528
- T1550
requiredDataConnectors:
- dataTypes:
  - AzureActivity
  connectorId: AzureActivity
description: |
  'This detection uses AzureActivity logs (Administrative category) to identify a suspicious application adding a server instance to an Microsoft Entra ID Hybrid Health AD FS service or deleting the AD FS service instance.
  Usually the Microsoft Entra ID Connect Health Agent application with ID cf6d7e68-f018-4e0a-a7b3-126e053fb88d and ID cb1056e2-e479-49de-ae31-7812af012ed8 is used to perform those operations.'  
tactics:
- CredentialAccess
- DefenseEvasion
query: |
  // Microsoft Entra ID Connect Health Agent - cf6d7e68-f018-4e0a-a7b3-126e053fb88d
  // Microsoft Entra ID Connect - cb1056e2-e479-49de-ae31-7812af012ed8
  let appList = dynamic(['cf6d7e68-f018-4e0a-a7b3-126e053fb88d','cb1056e2-e479-49de-ae31-7812af012ed8']);
  let operationNamesList = dynamic(['Microsoft.ADHybridHealthService/services/servicemembers/action','Microsoft.ADHybridHealthService/services/delete']);
  AzureActivity
  | where CategoryValue =~ 'Administrative'
  | where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'
  | where _ResourceId has 'AdFederationService'
  | where OperationNameValue in~ (operationNamesList)
  | 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])
  | where AppId !in (appList)
  | project-away claimsJson  
id: d9938c3b-16f9-444d-bc22-ea9a9110e0fd
version: 2.0.3

{
  "$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/d9938c3b-16f9-444d-bc22-ea9a9110e0fd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d9938c3b-16f9-444d-bc22-ea9a9110e0fd')]",
      "properties": {
        "alertRuleTemplateName": "d9938c3b-16f9-444d-bc22-ea9a9110e0fd",
        "customDetails": null,
        "description": "'This detection uses AzureActivity logs (Administrative category) to identify a suspicious application adding a server instance to an Microsoft Entra ID Hybrid Health AD FS service or deleting the AD FS service instance.\nUsually the Microsoft Entra ID Connect Health Agent application with ID cf6d7e68-f018-4e0a-a7b3-126e053fb88d and ID cb1056e2-e479-49de-ae31-7812af012ed8 is used to perform those operations.'\n",
        "displayName": "Microsoft Entra ID Hybrid Health AD FS Suspicious Application",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Caller",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CallerIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/AADHybridHealthADFSSuspApp.yaml",
        "query": "// Microsoft Entra ID Connect Health Agent - cf6d7e68-f018-4e0a-a7b3-126e053fb88d\n// Microsoft Entra ID Connect - cb1056e2-e479-49de-ae31-7812af012ed8\nlet appList = dynamic(['cf6d7e68-f018-4e0a-a7b3-126e053fb88d','cb1056e2-e479-49de-ae31-7812af012ed8']);\nlet operationNamesList = dynamic(['Microsoft.ADHybridHealthService/services/servicemembers/action','Microsoft.ADHybridHealthService/services/delete']);\nAzureActivity\n| where CategoryValue =~ 'Administrative'\n| where ResourceProviderValue =~ 'Microsoft.ADHybridHealthService'\n| where _ResourceId has 'AdFederationService'\n| where OperationNameValue in~ (operationNamesList)\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| where AppId !in (appList)\n| project-away claimsJson\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "DefenseEvasion"
        ],
        "tags": [
          "SimuLand"
        ],
        "techniques": [
          "T1528",
          "T1550"
        ],
        "templateVersion": "2.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}