Application Redirect URL Update

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Id	a1080fc1-13d1-479b-8340-255f0290d96c
Rulename	Application Redirect URL Update
Description	Detects the redirect URL of an app being changed. Applications associated with URLs not controlled by the organization can pose a security risk. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-applications#application-configuration-changes
Severity	Medium
Tactics	Persistence PrivilegeEscalation
Techniques	T1078.004
Required data connectors	AzureActiveDirectory
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/AuditLogs/ApplicationRedirectURLUpdate.yaml
Version	1.0.1
Arm template	a1080fc1-13d1-479b-8340-255f0290d96c.json

KQL

AuditLogs
  | where Category =~ "ApplicationManagement"
  | where Result =~ "success"
  | where OperationName =~ 'Update Application'
  | mv-expand TargetResources
  | mv-expand TargetResources.modifiedProperties
  | where TargetResources_modifiedProperties.displayName =~ "AppAddress"
  | extend Key = tostring(TargetResources_modifiedProperties.displayName)
  | extend NewValue = TargetResources_modifiedProperties.newValue
  | extend OldValue = TargetResources_modifiedProperties.oldValue
  | where isnotempty(Key) and isnotempty(NewValue)
  | project-reorder Key, NewValue, OldValue
  | extend NewUrls = extract_all('"Address":([^,]*)', tostring(NewValue))
  | extend OldUrls = extract_all('"Address":([^,]*)', tostring(OldValue))
  | extend AddedUrls = set_difference(NewUrls, OldUrls)
  | where array_length(AddedUrls) > 0
  | extend UserAgent = iif(tostring(AdditionalDetails[0].key) == "User-Agent", tostring(AdditionalDetails[0].value), "")
  | extend AddingUser = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName), "")
  | extend AddingApp = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)) , tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName), "")
  | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingApp)
  | project-away AddingApp, AddingUser
  | extend AppDisplayName = tostring(TargetResources.displayName)
  | extend ipAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
  | project-reorder TimeGenerated, AppDisplayName, AddedUrls, AddedBy, UserAgent, ipAddress

YAML

severity: Medium
triggerThreshold: 0
metadata:
  source:
    kind: Community
  support:
    tier: Community
  categories:
    domains:
    - Security - Others
  author:
    name: Pete Bryan
queryFrequency: 1d
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
id: a1080fc1-13d1-479b-8340-255f0290d96c
version: 1.0.1
name: Application Redirect URL Update
kind: Scheduled
query: |
  AuditLogs
    | where Category =~ "ApplicationManagement"
    | where Result =~ "success"
    | where OperationName =~ 'Update Application'
    | mv-expand TargetResources
    | mv-expand TargetResources.modifiedProperties
    | where TargetResources_modifiedProperties.displayName =~ "AppAddress"
    | extend Key = tostring(TargetResources_modifiedProperties.displayName)
    | extend NewValue = TargetResources_modifiedProperties.newValue
    | extend OldValue = TargetResources_modifiedProperties.oldValue
    | where isnotempty(Key) and isnotempty(NewValue)
    | project-reorder Key, NewValue, OldValue
    | extend NewUrls = extract_all('"Address":([^,]*)', tostring(NewValue))
    | extend OldUrls = extract_all('"Address":([^,]*)', tostring(OldValue))
    | extend AddedUrls = set_difference(NewUrls, OldUrls)
    | where array_length(AddedUrls) > 0
    | extend UserAgent = iif(tostring(AdditionalDetails[0].key) == "User-Agent", tostring(AdditionalDetails[0].value), "")
    | extend AddingUser = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName), "")
    | extend AddingApp = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)) , tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName), "")
    | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingApp)
    | project-away AddingApp, AddingUser
    | extend AppDisplayName = tostring(TargetResources.displayName)
    | extend ipAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
    | project-reorder TimeGenerated, AppDisplayName, AddedUrls, AddedBy, UserAgent, ipAddress  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/ApplicationRedirectURLUpdate.yaml
queryPeriod: 1d
relevantTechniques:
- T1078.004
triggerOperator: gt
tactics:
- Persistence
- PrivilegeEscalation
tags:
- AADSecOpsGuide
description: |
  'Detects the redirect URL of an app being changed.
    Applications associated with URLs not controlled by the organization can pose a security risk.
    Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-applications#application-configuration-changes'  
entityMappings:
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: AddedUrls
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AddedBy
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: ipAddress

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/a1080fc1-13d1-479b-8340-255f0290d96c')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a1080fc1-13d1-479b-8340-255f0290d96c')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Application Redirect URL Update",
        "description": "'Detects the redirect URL of an app being changed.\n  Applications associated with URLs not controlled by the organization can pose a security risk.\n  Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-applications#application-configuration-changes'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AuditLogs\n  | where Category =~ \"ApplicationManagement\"\n  | where Result =~ \"success\"\n  | where OperationName =~ 'Update Application'\n  | mv-expand TargetResources\n  | mv-expand TargetResources.modifiedProperties\n  | where TargetResources_modifiedProperties.displayName =~ \"AppAddress\"\n  | extend Key = tostring(TargetResources_modifiedProperties.displayName)\n  | extend NewValue = TargetResources_modifiedProperties.newValue\n  | extend OldValue = TargetResources_modifiedProperties.oldValue\n  | where isnotempty(Key) and isnotempty(NewValue)\n  | project-reorder Key, NewValue, OldValue\n  | extend NewUrls = extract_all('\"Address\":([^,]*)', tostring(NewValue))\n  | extend OldUrls = extract_all('\"Address\":([^,]*)', tostring(OldValue))\n  | extend AddedUrls = set_difference(NewUrls, OldUrls)\n  | where array_length(AddedUrls) > 0\n  | extend UserAgent = iif(tostring(AdditionalDetails[0].key) == \"User-Agent\", tostring(AdditionalDetails[0].value), \"\")\n  | extend AddingUser = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)) , tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName), \"\")\n  | extend AddingApp = iif(isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)) , tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName), \"\")\n  | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingApp)\n  | project-away AddingApp, AddingUser\n  | extend AppDisplayName = tostring(TargetResources.displayName)\n  | extend ipAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)\n  | project-reorder TimeGenerated, AppDisplayName, AddedUrls, AddedBy, UserAgent, ipAddress\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078.004"
        ],
        "alertRuleTemplateName": "a1080fc1-13d1-479b-8340-255f0290d96c",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "AddedUrls",
                "identifier": "Url"
              }
            ],
            "entityType": "URL"
          },
          {
            "fieldMappings": [
              {
                "columnName": "AddedBy",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "ipAddress",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "tags": [
          "AADSecOpsGuide"
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/ApplicationRedirectURLUpdate.yaml",
        "templateVersion": "1.0.1"
      }
    }
  ]
}