NRT Authentication Methods Changed for VIP Users

let security_info_actions = dynamic(["User registered security info", "User changed default security info", "User deleted security info", "Admin updated security info", "User reviewed security info", "Admin deleted security info", "Admin registered security info"]);
let VIPUsers = (_GetWatchlist('VIPUsers') | distinct ["User Principal Name"]);
AuditLogs
| where Category =~ "UserManagement"
| where ActivityDisplayName in (security_info_actions)
| extend Initiator = tostring(InitiatedBy.user.userPrincipalName)
| extend IP = tostring(InitiatedBy.user.ipAddress)
| extend Target = tolower(tostring(TargetResources[0].userPrincipalName))
| where Target in (VIPUsers)
| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target

version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/NRT_AuthenticationMethodsChangedforVIPUsers.yaml
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
entityMappings:
- fieldMappings:
  - columnName: Targets
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IP
    identifier: Address
  entityType: IP
kind: NRT
id: 29e99017-e28d-47be-8b9a-c8c711f8a903
severity: Medium
query: |
  let security_info_actions = dynamic(["User registered security info", "User changed default security info", "User deleted security info", "Admin updated security info", "User reviewed security info", "Admin deleted security info", "Admin registered security info"]);
  let VIPUsers = (_GetWatchlist('VIPUsers') | distinct ["User Principal Name"]);
  AuditLogs
  | where Category =~ "UserManagement"
  | where ActivityDisplayName in (security_info_actions)
  | extend Initiator = tostring(InitiatedBy.user.userPrincipalName)
  | extend IP = tostring(InitiatedBy.user.ipAddress)
  | extend Target = tolower(tostring(TargetResources[0].userPrincipalName))
  | where Target in (VIPUsers)
  | summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target  
tags:
- AADSecOpsGuide
description: |
    'Identifies authentication methods being changed for a list of VIP users watchlist. This could be an indication of an attacker adding an auth method to the account so they can have continued access.'
name: NRT Authentication Methods Changed for VIP Users
relevantTechniques:
- T1098
tactics:
- Persistence

{
  "$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/29e99017-e28d-47be-8b9a-c8c711f8a903')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/29e99017-e28d-47be-8b9a-c8c711f8a903')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Nrt",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "NRT Authentication Methods Changed for VIP Users",
        "description": "'Identifies authentication methods being changed for a list of VIP users watchlist. This could be an indication of an attacker adding an auth method to the account so they can have continued access.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let security_info_actions = dynamic([\"User registered security info\", \"User changed default security info\", \"User deleted security info\", \"Admin updated security info\", \"User reviewed security info\", \"Admin deleted security info\", \"Admin registered security info\"]);\nlet VIPUsers = (_GetWatchlist('VIPUsers') | distinct [\"User Principal Name\"]);\nAuditLogs\n| where Category =~ \"UserManagement\"\n| where ActivityDisplayName in (security_info_actions)\n| extend Initiator = tostring(InitiatedBy.user.userPrincipalName)\n| extend IP = tostring(InitiatedBy.user.ipAddress)\n| extend Target = tolower(tostring(TargetResources[0].userPrincipalName))\n| where Target in (VIPUsers)\n| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target\n",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "alertRuleTemplateName": "29e99017-e28d-47be-8b9a-c8c711f8a903",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "Targets"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IP"
              }
            ]
          }
        ],
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/NRT_AuthenticationMethodsChangedforVIPUsers.yaml",
        "tags": [
          "AADSecOpsGuide"
        ]
      }
    }
  ]
}