cloudflare/Azure-Sentinel

id: 694c91ee-d606-4ba9-928e-405a2dd0ff0f
name: Authentication Methods Changed for Privileged Account
description: |
  'Identifies authentication methods being changed for a privileged account. This could be an indication 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
requiredDataConnectors:
  - connectorId: AzureActiveDirectory
    dataTypes:
      - AuditLogs
queryFrequency: 2h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
relevantTechniques:
  - T1098
tags:
  - AADSecOpsGuide
query: |
  let queryperiod = 14d;
  let queryfrequency = 2h;
  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 = (
      IdentityInfo
      | where TimeGenerated > ago(queryperiod)
      | mv-expand AssignedRoles
      | where AssignedRoles matches regex 'Admin'
      | summarize by tolower(AccountUPN));
  AuditLogs
  | where TimeGenerated > ago(queryfrequency)
  | 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)
  // Uncomment the line below if you are experiencing high volumes of Target entities. If this is uncommented, the Target column will not be mapped to an entity.
  //| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8), Targets=make_set(Target, MaxSize=256) by Initiator, IP, Result
  // Comment out this line below, if line above is used.
  | summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8) by Initiator, IP, Result, Targets = Target
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: Targets
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: Initiator
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IP
version: 1.0.6
kind: Scheduled