Suspicious modification of Global Administrator user properties

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Id	48602a24-67cf-4362-b258-3f4249e55def
Rulename	Suspicious modification of Global Administrator user properties
Description	This query will detect if user properties of Global Administrator are updated by an existing user. Usually only user administrator or other global administrator can update such properties. Investigate if such user change is an attempt to elevate an existing low privileged identity or rogue administrator activity
Severity	Medium
Tactics	PrivilegeEscalation
Techniques	T1078.004
Required data connectors	AzureActiveDirectory BehaviorAnalytics
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SuspiciousModificationofGlobalAdminProperties.yaml
Version	1.0.1
Arm template	48602a24-67cf-4362-b258-3f4249e55def.json

KQL

let lookback = 1d;
let GlobalAdmins = IdentityInfo
| where TimeGenerated > ago(lookback)
| extend IsGlobalAdmin = set_has_element(AssignedRoles, "Global Administrator")
| where IsGlobalAdmin == true
| distinct AccountUPN;
GlobalAdmins
| join kind=inner ( AuditLogs
| where TimeGenerated > ago(lookback)
| where OperationName=~ "Update user" 
| where Result =~ "success" 
| mv-expand TargetResources 
| mv-expand TargetResources.modifiedProperties 
| extend displayName_ = tostring(TargetResources_modifiedProperties.displayName) , oldValue_ = tostring(TargetResources_modifiedProperties.oldValue), newValue_ = tostring(TargetResources_modifiedProperties.newValue)
| where displayName_ == "UserPrincipalName" and oldValue_ !has "#EXT" and newValue_ has "#EXT"
| extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName) 
| extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , IPAddress = tostring(InitiatedBy.["user"].["ipAddress"])
) on $left.AccountUPN == $right.oldValue_
| project TimeGenerated, AADTenantId, IPAddress, Initiator, displayName_, oldValue_, newValue_

YAML

queryFrequency: 1d
metadata:
  author:
    name: Ashwin Patil
  source:
    kind: Community
  categories:
    domains:
    - Security - Others
    - Identity
  support:
    tier: Community
triggerOperator: gt
tactics:
- PrivilegeEscalation
description: |
  ' This query will detect if user properties of Global Administrator are updated by an existing user. Usually only user administrator or other global administrator can update such properties.
  Investigate if such user change is an attempt to elevate an existing low privileged identity or rogue administrator activity'  
relevantTechniques:
- T1078.004
name: Suspicious modification of Global Administrator user properties
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SuspiciousModificationofGlobalAdminProperties.yaml
severity: Medium
triggerThreshold: 0
version: 1.0.1
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: Initiator
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: displayName_
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPAddress
tags:
- GuestorExternalIdentities
id: 48602a24-67cf-4362-b258-3f4249e55def
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
- connectorId: BehaviorAnalytics
  dataTypes:
  - IdentityInfo
kind: Scheduled
query: |
  let lookback = 1d;
  let GlobalAdmins = IdentityInfo
  | where TimeGenerated > ago(lookback)
  | extend IsGlobalAdmin = set_has_element(AssignedRoles, "Global Administrator")
  | where IsGlobalAdmin == true
  | distinct AccountUPN;
  GlobalAdmins
  | join kind=inner ( AuditLogs
  | where TimeGenerated > ago(lookback)
  | where OperationName=~ "Update user" 
  | where Result =~ "success" 
  | mv-expand TargetResources 
  | mv-expand TargetResources.modifiedProperties 
  | extend displayName_ = tostring(TargetResources_modifiedProperties.displayName) , oldValue_ = tostring(TargetResources_modifiedProperties.oldValue), newValue_ = tostring(TargetResources_modifiedProperties.newValue)
  | where displayName_ == "UserPrincipalName" and oldValue_ !has "#EXT" and newValue_ has "#EXT"
  | extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName) 
  | extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , IPAddress = tostring(InitiatedBy.["user"].["ipAddress"])
  ) on $left.AccountUPN == $right.oldValue_
  | project TimeGenerated, AADTenantId, IPAddress, Initiator, displayName_, oldValue_, newValue_  
queryPeriod: 1d

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/48602a24-67cf-4362-b258-3f4249e55def')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/48602a24-67cf-4362-b258-3f4249e55def')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Suspicious modification of Global Administrator user properties",
        "description": "' This query will detect if user properties of Global Administrator are updated by an existing user. Usually only user administrator or other global administrator can update such properties.\nInvestigate if such user change is an attempt to elevate an existing low privileged identity or rogue administrator activity'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let lookback = 1d;\nlet GlobalAdmins = IdentityInfo\n| where TimeGenerated > ago(lookback)\n| extend IsGlobalAdmin = set_has_element(AssignedRoles, \"Global Administrator\")\n| where IsGlobalAdmin == true\n| distinct AccountUPN;\nGlobalAdmins\n| join kind=inner ( AuditLogs\n| where TimeGenerated > ago(lookback)\n| where OperationName=~ \"Update user\" \n| where Result =~ \"success\" \n| mv-expand TargetResources \n| mv-expand TargetResources.modifiedProperties \n| extend displayName_ = tostring(TargetResources_modifiedProperties.displayName) , oldValue_ = tostring(TargetResources_modifiedProperties.oldValue), newValue_ = tostring(TargetResources_modifiedProperties.newValue)\n| where displayName_ == \"UserPrincipalName\" and oldValue_ !has \"#EXT\" and newValue_ has \"#EXT\"\n| extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName) \n| extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , IPAddress = tostring(InitiatedBy.[\"user\"].[\"ipAddress\"])\n) on $left.AccountUPN == $right.oldValue_\n| project TimeGenerated, AADTenantId, IPAddress, Initiator, displayName_, oldValue_, newValue_\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078.004"
        ],
        "alertRuleTemplateName": "48602a24-67cf-4362-b258-3f4249e55def",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "Initiator"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "displayName_"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPAddress"
              }
            ]
          }
        ],
        "templateVersion": "1.0.1",
        "tags": [
          "GuestorExternalIdentities"
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SuspiciousModificationofGlobalAdminProperties.yaml"
      }
    }
  ]
}