Authentication Methods Changed for Privileged Account

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Id	694c91ee-d606-4ba9-928e-405a2dd0ff0f
Rulename	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
Tactics	Persistence
Techniques	T1098
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	2h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/AuthenticationMethodsChangedforPrivilegedAccount.yaml
Version	1.0.7
Arm template	694c91ee-d606-4ba9-928e-405a2dd0ff0f.json

KQL

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)
| mv-apply TargetResource = TargetResources on 
  (
      where TargetResource.type =~ "User"
      | extend Target = tostring(TargetResource.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
| extend InitiatorName = tostring(split(Initiator,'@',0)[0]), 
         InitiatorUPNSuffix = tostring(split(Initiator,'@',1)[0]),
         TargetName = iff(tostring(Targets) has "[", "", tostring(split(Targets,'@',0)[0])), 
         TargetUPNSuffix = iff(tostring(Targets) has "[", "", tostring(split(Targets,'@',1)[0]))

YAML

triggerOperator: gt
id: 694c91ee-d606-4ba9-928e-405a2dd0ff0f
queryFrequency: 2h
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: InitiatorName
    identifier: Name
  - columnName: InitiatorUPNSuffix
    identifier: UPNSuffix
- entityType: Account
  fieldMappings:
  - columnName: TargetName
    identifier: Name
  - columnName: TargetUPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: IP
    identifier: Address
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
severity: High
triggerThreshold: 0
kind: Scheduled
status: Available
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/AuthenticationMethodsChangedforPrivilegedAccount.yaml
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)
  | mv-apply TargetResource = TargetResources on 
    (
        where TargetResource.type =~ "User"
        | extend Target = tostring(TargetResource.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
  | extend InitiatorName = tostring(split(Initiator,'@',0)[0]), 
           InitiatorUPNSuffix = tostring(split(Initiator,'@',1)[0]),
           TargetName = iff(tostring(Targets) has "[", "", tostring(split(Targets,'@',0)[0])), 
           TargetUPNSuffix = iff(tostring(Targets) has "[", "", tostring(split(Targets,'@',1)[0]))  
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'  
name: Authentication Methods Changed for Privileged Account
relevantTechniques:
- T1098
tactics:
- Persistence
version: 1.0.7
tags:
- AADSecOpsGuide

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/694c91ee-d606-4ba9-928e-405a2dd0ff0f')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/694c91ee-d606-4ba9-928e-405a2dd0ff0f')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "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.\nRef : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'\n",
        "severity": "High",
        "enabled": true,
        "query": "let queryperiod = 14d;\nlet queryfrequency = 2h;\nlet 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 = (\n    IdentityInfo\n    | where TimeGenerated > ago(queryperiod)\n    | mv-expand AssignedRoles\n    | where AssignedRoles matches regex 'Admin'\n    | summarize by tolower(AccountUPN));\nAuditLogs\n| where TimeGenerated > ago(queryfrequency)\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 = tostring(TargetResource.userPrincipalName)\n  )\n| where Target in (VIPUsers)\n// 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.\n//| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8), Targets=make_set(Target, MaxSize=256) by Initiator, IP, Result\n// Comment out this line below, if line above is used.\n| summarize Start=min(TimeGenerated), End=max(TimeGenerated), Actions = make_set(ResultReason, MaxSize=8) by Initiator, IP, Result, Targets = Target\n| extend InitiatorName = tostring(split(Initiator,'@',0)[0]), \n         InitiatorUPNSuffix = tostring(split(Initiator,'@',1)[0]),\n         TargetName = iff(tostring(Targets) has \"[\", \"\", tostring(split(Targets,'@',0)[0])), \n         TargetUPNSuffix = iff(tostring(Targets) has \"[\", \"\", tostring(split(Targets,'@',1)[0]))\n",
        "queryFrequency": "PT2H",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "alertRuleTemplateName": "694c91ee-d606-4ba9-928e-405a2dd0ff0f",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "InitiatorName"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "InitiatorUPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "TargetName"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "TargetUPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IP"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/AuthenticationMethodsChangedforPrivilegedAccount.yaml",
        "templateVersion": "1.0.7",
        "tags": [
          "AADSecOpsGuide"
        ],
        "status": "Available"
      }
    }
  ]
}