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)
| mv-apply TargetResource = TargetResources on 
  (
      where TargetResource.type =~ "User"
      | extend Target = trim(@'"',tolower(tostring(TargetResource.userPrincipalName)))
  )
| where Target in~ (VIPUsers)
| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target
| extend Name = tostring(split(Target,'@',0)[0]), UPNSuffix = tostring(split(Target,'@',1)[0])

requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
name: NRT Authentication Methods Changed for VIP Users
tags:
- AADSecOpsGuide
id: 29e99017-e28d-47be-8b9a-c8c711f8a903
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.'
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)
  | mv-apply TargetResource = TargetResources on 
    (
        where TargetResource.type =~ "User"
        | extend Target = trim(@'"',tolower(tostring(TargetResource.userPrincipalName)))
    )
  | where Target in~ (VIPUsers)
  | summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target
  | extend Name = tostring(split(Target,'@',0)[0]), UPNSuffix = tostring(split(Target,'@',1)[0])  
version: 1.0.1
kind: NRT
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/NRT_AuthenticationMethodsChangedforVIPUsers.yaml
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IP
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-preview",
      "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| mv-apply TargetResource = TargetResources on \n  (\n      where TargetResource.type =~ \"User\"\n      | extend Target = trim(@'\"',tolower(tostring(TargetResource.userPrincipalName)))\n  )\n| where Target in~ (VIPUsers)\n| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason) by Initiator, IP, Result, Target\n| extend Name = tostring(split(Target,'@',0)[0]), UPNSuffix = tostring(split(Target,'@',1)[0])\n",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "alertRuleTemplateName": "29e99017-e28d-47be-8b9a-c8c711f8a903",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "Name"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "UPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IP"
              }
            ],
            "entityType": "IP"
          }
        ],
        "tags": [
          "AADSecOpsGuide"
        ],
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/NRT_AuthenticationMethodsChangedforVIPUsers.yaml"
      }
    }
  ]
}