Authentication Method Changed for Privileged Account

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Id	feb0a2fb-ae75-4343-8cbc-ed545f1da289
Rulename	Authentication Method Changed for Privileged Account
Description	Identifies authentication methods being changed for a privileged account. This could be an indicated of an attacker adding an auth method to the account so they can have continued access. Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1
Severity	High
Tactics	Persistence
Techniques	T1098
Required data connectors	AzureActiveDirectory BehaviorAnalytics
Kind	Scheduled
Query frequency	2h
Query period	2h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Business Email Compromise - Financial Fraud/Analytic Rules/AuthenticationMethodChangedforPrivilegedAccount.yaml
Version	1.0.1
Arm template	feb0a2fb-ae75-4343-8cbc-ed545f1da289.json

KQL

let VIPUsers = (IdentityInfo
| where AssignedRoles contains "Admin"
| summarize by tolower(AccountUPN));
AuditLogs
| where Category =~ "UserManagement"
| where ActivityDisplayName =~ "User registered security info"
| where LoggedByService =~ "Authentication Methods"
| extend AccountCustomEntity = tostring(TargetResources[0].userPrincipalName), IPCustomEntity = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
| where AccountCustomEntity in (VIPUsers)

YAML

kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Business Email Compromise - Financial Fraud/Analytic Rules/AuthenticationMethodChangedforPrivilegedAccount.yaml
severity: High
tags:
- AADSecOpsGuide
name: Authentication Method Changed for Privileged Account
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
relevantTechniques:
- T1098
queryFrequency: 2h
triggerThreshold: 0
queryPeriod: 2h
description: |
  'Identifies authentication methods being changed for a privileged account. This could be an indicated of an attacker adding an auth method to the account so they can have continued access.
  Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'  
id: feb0a2fb-ae75-4343-8cbc-ed545f1da289
version: 1.0.1
tactics:
- Persistence
query: |
  let VIPUsers = (IdentityInfo
  | where AssignedRoles contains "Admin"
  | summarize by tolower(AccountUPN));
  AuditLogs
  | where Category =~ "UserManagement"
  | where ActivityDisplayName =~ "User registered security info"
  | where LoggedByService =~ "Authentication Methods"
  | extend AccountCustomEntity = tostring(TargetResources[0].userPrincipalName), IPCustomEntity = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
  | where AccountCustomEntity in (VIPUsers)  
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - BehaviorAnalytics
  connectorId: BehaviorAnalytics
triggerOperator: gt

ARM

{
  "$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/feb0a2fb-ae75-4343-8cbc-ed545f1da289')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/feb0a2fb-ae75-4343-8cbc-ed545f1da289')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Authentication Method Changed for Privileged Account",
        "description": "'Identifies authentication methods being changed for a privileged account. This could be an indicated of an attacker adding an auth method to the account so they can have continued access.\nRef : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'\n",
        "severity": "High",
        "enabled": true,
        "query": "let VIPUsers = (IdentityInfo\n| where AssignedRoles contains \"Admin\"\n| summarize by tolower(AccountUPN));\nAuditLogs\n| where Category =~ \"UserManagement\"\n| where ActivityDisplayName =~ \"User registered security info\"\n| where LoggedByService =~ \"Authentication Methods\"\n| extend AccountCustomEntity = tostring(TargetResources[0].userPrincipalName), IPCustomEntity = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)\n| where AccountCustomEntity in (VIPUsers)\n",
        "queryFrequency": "PT2H",
        "queryPeriod": "PT2H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "alertRuleTemplateName": "feb0a2fb-ae75-4343-8cbc-ed545f1da289",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Business Email Compromise - Financial Fraud/Analytic Rules/AuthenticationMethodChangedforPrivilegedAccount.yaml",
        "tags": [
          "AADSecOpsGuide"
        ]
      }
    }
  ]
}