TI Map URL Entity to EmailUrlInfo

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let EmailUrlInfo_ = materialize(EmailUrlInfo
    | where isnotempty(Url)
    | where TimeGenerated >= ago(dt_lookBack)
    | extend Url = tolower(Url)
    | extend EmailUrlInfo_TimeGenerated = TimeGenerated);
let EmailUrls = EmailUrlInfo_ | distinct Url | summarize make_list(Url);
let EmailUrlDomains = EmailUrlInfo_ | distinct UrlDomain | summarize make_list(UrlDomain);
let EmailEvents_ = materialize(EmailEvents
    | where TimeGenerated >= ago(dt_lookBack));
let TI = materialize(ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | where (isnotempty(Url) or isnotempty(DomainName)) 
    | where tolower(Url) in (EmailUrls) or tolower(DomainName) in (EmailUrlDomains)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now());
(union
    (TI | join kind=innerunique (EmailUrlInfo_) on Url),
    (TI | join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain))
| where EmailUrlInfo_TimeGenerated < ExpirationDateTime
| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, Url
| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, UrlDomain, UrlLocation, NetworkMessageId
| extend timestamp = EmailUrlInfo_TimeGenerated
| join kind=inner (EmailEvents_) on NetworkMessageId
| where DeliveryAction !has "Blocked"
| extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0])

relevantTechniques:
- T1071
name: TI Map URL Entity to EmailUrlInfo
requiredDataConnectors:
- dataTypes:
  - EmailUrlInfo
  connectorId: AzureActiveDirectory
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: RecipientEmailAddress
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Url
    columnName: Url
  entityType: URL
triggerThreshold: 0
id: a0038239-72f4-4f7b-90ff-37f89f7881e0
tactics:
- CommandAndControl
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_EmailUrlInfo.yaml
queryPeriod: 14d
kind: Scheduled
queryFrequency: 1h
severity: Medium
description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in EmailUrlInfo.'
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let EmailUrlInfo_ = materialize(EmailUrlInfo
      | where isnotempty(Url)
      | where TimeGenerated >= ago(dt_lookBack)
      | extend Url = tolower(Url)
      | extend EmailUrlInfo_TimeGenerated = TimeGenerated);
  let EmailUrls = EmailUrlInfo_ | distinct Url | summarize make_list(Url);
  let EmailUrlDomains = EmailUrlInfo_ | distinct UrlDomain | summarize make_list(UrlDomain);
  let EmailEvents_ = materialize(EmailEvents
      | where TimeGenerated >= ago(dt_lookBack));
  let TI = materialize(ThreatIntelligenceIndicator
      | where TimeGenerated >= ago(ioc_lookBack)
      | where (isnotempty(Url) or isnotempty(DomainName)) 
      | where tolower(Url) in (EmailUrls) or tolower(DomainName) in (EmailUrlDomains)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now());
  (union
      (TI | join kind=innerunique (EmailUrlInfo_) on Url),
      (TI | join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain))
  | where EmailUrlInfo_TimeGenerated < ExpirationDateTime
  | summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, Url
  | project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, UrlDomain, UrlLocation, NetworkMessageId
  | extend timestamp = EmailUrlInfo_TimeGenerated
  | join kind=inner (EmailEvents_) on NetworkMessageId
  | where DeliveryAction !has "Blocked"
  | extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0])  
triggerOperator: gt

{
  "$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/a0038239-72f4-4f7b-90ff-37f89f7881e0')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a0038239-72f4-4f7b-90ff-37f89f7881e0')]",
      "properties": {
        "alertRuleTemplateName": "a0038239-72f4-4f7b-90ff-37f89f7881e0",
        "customDetails": null,
        "description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in EmailUrlInfo.'\n",
        "displayName": "TI Map URL Entity to EmailUrlInfo",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "RecipientEmailAddress",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_EmailUrlInfo.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet EmailUrlInfo_ = materialize(EmailUrlInfo\n    | where isnotempty(Url)\n    | where TimeGenerated >= ago(dt_lookBack)\n    | extend Url = tolower(Url)\n    | extend EmailUrlInfo_TimeGenerated = TimeGenerated);\nlet EmailUrls = EmailUrlInfo_ | distinct Url | summarize make_list(Url);\nlet EmailUrlDomains = EmailUrlInfo_ | distinct UrlDomain | summarize make_list(UrlDomain);\nlet EmailEvents_ = materialize(EmailEvents\n    | where TimeGenerated >= ago(dt_lookBack));\nlet TI = materialize(ThreatIntelligenceIndicator\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | where (isnotempty(Url) or isnotempty(DomainName)) \n    | where tolower(Url) in (EmailUrls) or tolower(DomainName) in (EmailUrlDomains)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now());\n(union\n    (TI | join kind=innerunique (EmailUrlInfo_) on Url),\n    (TI | join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain))\n| where EmailUrlInfo_TimeGenerated < ExpirationDateTime\n| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, Url\n| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, UrlDomain, UrlLocation, NetworkMessageId\n| extend timestamp = EmailUrlInfo_TimeGenerated\n| join kind=inner (EmailEvents_) on NetworkMessageId\n| where DeliveryAction !has \"Blocked\"\n| extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}