Authentication Methods Changed for Privileged Account

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
  - connectorId: BehaviorAnalytics
    dataTypes:
      - IdentityInfo
queryFrequency: 2h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
status: Available
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 contains 'Admin'
      | summarize by AccountUPN);
  AuditLogs
  | where TimeGenerated > ago(queryfrequency)
  | where Category =~ "UserManagement"
  | where ActivityDisplayName in (security_info_actions)
  | extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
  | extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
  | extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
  | extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
  | extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
  | mv-apply TargetResource = TargetResources on 
    (
        where TargetResource.type =~ "User"
        | extend TargetUserPrincipalName = tostring(TargetResource.userPrincipalName)
    )
  | where TargetUserPrincipalName 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 InitiatingAppName, InitiatingAppServicePrincipalId, 
  InitiatingUserPrincipalName, InitiatingAadUserId, InitiatingIpAddress, TargetUserPrincipalName, Result
  | extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1]), 
  TargetName = iff(tostring(TargetUserPrincipalName) has "[", "", tostring(split(TargetUserPrincipalName,'@',0)[0])), TargetUPNSuffix = iff(tostring(TargetUserPrincipalName) has "[", "", tostring(split(TargetUserPrincipalName,'@',1)[0]))
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: InitiatingAppName
      - identifier: AadUserId
        columnName: InitiatingAppServicePrincipalId
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: InitiatingUserPrincipalName
      - identifier: Name
        columnName: InitiatingAccountName
      - identifier: UPNSuffix
        columnName: InitiatingAccountUPNSuffix
  - entityType: Account
    fieldMappings:
      - identifier: AadUserId
        columnName: InitiatingAadUserId
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: InitiatingIpAddress
version: 1.1.1
kind: Scheduled