URL Added to Application from Unknown Domain
| Id | 017e095a-94d8-430c-a047-e51a11fb737b |
| Rulename | URL Added to Application from Unknown Domain |
| Description | Detects a URL being added to an application where the domain is not one that is associated with the tenant. The query uses domains seen in sign in logs to determine if the domain is associated with the tenant. Applications associated with URLs not controlled by the organization can pose a security risk. Ref: https://learn.microsoft.com/en-gb/entra/architecture/security-operations-applications#application-configuration-changes |
| Severity | High |
| Tactics | Persistence PrivilegeEscalation |
| Techniques | T1078.004 |
| Required data connectors | AzureActiveDirectory |
| Kind | Scheduled |
| Query frequency | 2h |
| Query period | 2h |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/URLAddedtoApplicationfromUnknownDomain.yaml |
| Version | 1.1.1 |
| Arm template | 017e095a-94d8-430c-a047-e51a11fb737b.json |
let domains =
SigninLogs
| where ResultType == 0
| extend domain = split(UserPrincipalName, "@")[1]
| extend domain = tostring(split(UserPrincipalName, "@")[1])
| summarize by tolower(tostring(domain));
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 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(InitiatedBy.user.ipAddress)
| extend InitiatedBy = tostring(iff(isnotempty(InitiatingUserPrincipalName),InitiatingUserPrincipalName, InitiatingAppName))
| extend AppDisplayName = tostring(TargetResources.displayName)
| where isnotempty(AddedUrls)
| mv-expand AddedUrls
| extend AddedUrls = trim(@'"', tostring(AddedUrls))
| extend Domain = extract("^(?:https?:\\/\\/)?(?:[^@\\/\\n]+@)?(?:www\\.)?([^:\\/?\\n]+)/", 1, replace_string(tolower(AddedUrls), '"', ""))
| where isnotempty(Domain)
| extend Domain = strcat(split(Domain, ".")[-2], ".", split(Domain, ".")[-1])
| where Domain !in (domains)
| project-reorder TimeGenerated, AppDisplayName, AddedUrls, InitiatedBy, UserAgent, InitiatingIPAddress
| extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/URLAddedtoApplicationfromUnknownDomain.yaml
query: |
let domains =
SigninLogs
| where ResultType == 0
| extend domain = split(UserPrincipalName, "@")[1]
| extend domain = tostring(split(UserPrincipalName, "@")[1])
| summarize by tolower(tostring(domain));
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 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(InitiatedBy.user.ipAddress)
| extend InitiatedBy = tostring(iff(isnotempty(InitiatingUserPrincipalName),InitiatingUserPrincipalName, InitiatingAppName))
| extend AppDisplayName = tostring(TargetResources.displayName)
| where isnotempty(AddedUrls)
| mv-expand AddedUrls
| extend AddedUrls = trim(@'"', tostring(AddedUrls))
| extend Domain = extract("^(?:https?:\\/\\/)?(?:[^@\\/\\n]+@)?(?:www\\.)?([^:\\/?\\n]+)/", 1, replace_string(tolower(AddedUrls), '"', ""))
| where isnotempty(Domain)
| extend Domain = strcat(split(Domain, ".")[-2], ".", split(Domain, ".")[-1])
| where Domain !in (domains)
| project-reorder TimeGenerated, AppDisplayName, AddedUrls, InitiatedBy, UserAgent, InitiatingIPAddress
| extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, "@")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, "@")[1])
description: |
'Detects a URL being added to an application where the domain is not one that is associated with the tenant.
The query uses domains seen in sign in logs to determine if the domain is associated with the tenant.
Applications associated with URLs not controlled by the organization can pose a security risk.
Ref: https://learn.microsoft.com/en-gb/entra/architecture/security-operations-applications#application-configuration-changes'
severity: High
requiredDataConnectors:
- dataTypes:
- AuditLogs
connectorId: AzureActiveDirectory
tags:
- AADSecOpsGuide
triggerThreshold: 0
metadata:
source:
kind: Community
categories:
domains:
- Security - Others
author:
name: Microsoft Security Research
support:
tier: Community
entityMappings:
- entityType: URL
fieldMappings:
- columnName: AddedUrls
identifier: Url
- entityType: Account
fieldMappings:
- columnName: InitiatingAppName
identifier: Name
- columnName: InitiatingAppServicePrincipalId
identifier: AadUserId
- entityType: Account
fieldMappings:
- columnName: InitiatingUserPrincipalName
identifier: FullName
- columnName: InitiatingAccountName
identifier: Name
- columnName: InitiatingAccountUPNSuffix
identifier: UPNSuffix
- entityType: Account
fieldMappings:
- columnName: InitiatingAadUserId
identifier: AadUserId
- entityType: IP
fieldMappings:
- columnName: InitiatingIPAddress
identifier: Address
tactics:
- Persistence
- PrivilegeEscalation
version: 1.1.1
relevantTechniques:
- T1078.004
triggerOperator: gt
name: URL Added to Application from Unknown Domain
id: 017e095a-94d8-430c-a047-e51a11fb737b
kind: Scheduled
queryFrequency: 2h
queryPeriod: 2h
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/017e095a-94d8-430c-a047-e51a11fb737b')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/017e095a-94d8-430c-a047-e51a11fb737b')]",
"properties": {
"alertRuleTemplateName": "017e095a-94d8-430c-a047-e51a11fb737b",
"customDetails": null,
"description": "'Detects a URL being added to an application where the domain is not one that is associated with the tenant.\n The query uses domains seen in sign in logs to determine if the domain is associated with the tenant.\n Applications associated with URLs not controlled by the organization can pose a security risk.\n Ref: https://learn.microsoft.com/en-gb/entra/architecture/security-operations-applications#application-configuration-changes'\n",
"displayName": "URL Added to Application from Unknown Domain",
"enabled": true,
"entityMappings": [
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "AddedUrls",
"identifier": "Url"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "InitiatingAppName",
"identifier": "Name"
},
{
"columnName": "InitiatingAppServicePrincipalId",
"identifier": "AadUserId"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "InitiatingUserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "InitiatingAccountName",
"identifier": "Name"
},
{
"columnName": "InitiatingAccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "InitiatingAadUserId",
"identifier": "AadUserId"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "InitiatingIPAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/URLAddedtoApplicationfromUnknownDomain.yaml",
"query": "let domains =\n SigninLogs\n | where ResultType == 0\n | extend domain = split(UserPrincipalName, \"@\")[1]\n | extend domain = tostring(split(UserPrincipalName, \"@\")[1])\n | summarize by tolower(tostring(domain));\n 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 InitiatingAppName = tostring(InitiatedBy.app.displayName)\n | extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)\n | extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)\n | extend InitiatingAadUserId = tostring(InitiatedBy.user.id)\n | extend InitiatingIPAddress = tostring(InitiatedBy.user.ipAddress)\n | extend InitiatedBy = tostring(iff(isnotempty(InitiatingUserPrincipalName),InitiatingUserPrincipalName, InitiatingAppName))\n | extend AppDisplayName = tostring(TargetResources.displayName)\n | where isnotempty(AddedUrls)\n | mv-expand AddedUrls\n | extend AddedUrls = trim(@'\"', tostring(AddedUrls))\n | extend Domain = extract(\"^(?:https?:\\\\/\\\\/)?(?:[^@\\\\/\\\\n]+@)?(?:www\\\\.)?([^:\\\\/?\\\\n]+)/\", 1, replace_string(tolower(AddedUrls), '\"', \"\"))\n | where isnotempty(Domain)\n | extend Domain = strcat(split(Domain, \".\")[-2], \".\", split(Domain, \".\")[-1])\n | where Domain !in (domains)\n | project-reorder TimeGenerated, AppDisplayName, AddedUrls, InitiatedBy, UserAgent, InitiatingIPAddress\n | extend InitiatingAccountName = tostring(split(InitiatingUserPrincipalName, \"@\")[0]), InitiatingAccountUPNSuffix = tostring(split(InitiatingUserPrincipalName, \"@\")[1])\n",
"queryFrequency": "PT2H",
"queryPeriod": "PT2H",
"severity": "High",
"subTechniques": [
"T1078.004"
],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Persistence",
"PrivilegeEscalation"
],
"tags": [
"AADSecOpsGuide"
],
"techniques": [
"T1078"
],
"templateVersion": "1.1.1",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}