TI Map URL Entity to UrlClickEvents

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let UrlClickEvents_ = materialize(UrlClickEvents
    | where TimeGenerated >= ago(dt_lookBack)
    | extend UrlClickEvents_TimeGenerated = TimeGenerated);
let ChainReportID = UrlClickEvents_
    | mv-expand todynamic(UrlChain)
    | extend UrlChain = tolower(UrlChain)
    | project ReportId, Url, UrlChain;
// Url is not always in UrlChain, so we need to check both
let ClickedUrls = 
  (union isfuzzy=false (ChainReportID), (ChainReportID | project Url = UrlChain))
  | distinct Url
  | summarize make_list(Url);
let TI = materialize(ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | where isnotempty(Url) and tolower(Url) in (ClickedUrls)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | project-rename TI_Url = Url, TI_Type = Type
  );
(union isfuzzy=false (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.UrlChain),
  (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.Url))
| project-away UrlChain
| join kind=innerunique (UrlClickEvents_) on ReportId
| where UrlClickEvents_TimeGenerated < ExpirationDateTime
| summarize UrlClickEvents_TimeGenerated = arg_max(UrlClickEvents_TimeGenerated, *) by IndicatorId
| project UrlClickEvents_TimeGenerated, AccountUpn, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, NetworkMessageId
| extend timestamp = UrlClickEvents_TimeGenerated
| extend timestamp = UrlClickEvents_TimeGenerated, Name = tostring(split(AccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(AccountUpn, '@', 1)[0])

entityMappings:
- fieldMappings:
  - columnName: AccountUpn
    identifier: FullName
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: Url
    identifier: Url
  entityType: URL
name: TI Map URL Entity to UrlClickEvents
triggerOperator: gt
kind: Scheduled
severity: Medium
id: 23391c84-87d8-452f-a84c-47a62f01e115
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_UrlClickEvents.yaml
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - UrlClickEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
version: 1.0.1
description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in UrlClickEvents.'
tactics:
- Impact
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let UrlClickEvents_ = materialize(UrlClickEvents
      | where TimeGenerated >= ago(dt_lookBack)
      | extend UrlClickEvents_TimeGenerated = TimeGenerated);
  let ChainReportID = UrlClickEvents_
      | mv-expand todynamic(UrlChain)
      | extend UrlChain = tolower(UrlChain)
      | project ReportId, Url, UrlChain;
  // Url is not always in UrlChain, so we need to check both
  let ClickedUrls = 
    (union isfuzzy=false (ChainReportID), (ChainReportID | project Url = UrlChain))
    | distinct Url
    | summarize make_list(Url);
  let TI = materialize(ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | where isnotempty(Url) and tolower(Url) in (ClickedUrls)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
    | project-rename TI_Url = Url, TI_Type = Type
    );
  (union isfuzzy=false (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.UrlChain),
    (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.Url))
  | project-away UrlChain
  | join kind=innerunique (UrlClickEvents_) on ReportId
  | where UrlClickEvents_TimeGenerated < ExpirationDateTime
  | summarize UrlClickEvents_TimeGenerated = arg_max(UrlClickEvents_TimeGenerated, *) by IndicatorId
  | project UrlClickEvents_TimeGenerated, AccountUpn, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, NetworkMessageId
  | extend timestamp = UrlClickEvents_TimeGenerated
  | extend timestamp = UrlClickEvents_TimeGenerated, Name = tostring(split(AccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(AccountUpn, '@', 1)[0])  
queryFrequency: 1h

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/23391c84-87d8-452f-a84c-47a62f01e115')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/23391c84-87d8-452f-a84c-47a62f01e115')]",
      "properties": {
        "alertRuleTemplateName": "23391c84-87d8-452f-a84c-47a62f01e115",
        "customDetails": null,
        "description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in UrlClickEvents.'\n",
        "displayName": "TI Map URL Entity to UrlClickEvents",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountUpn",
                "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_UrlClickEvents.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet UrlClickEvents_ = materialize(UrlClickEvents\n    | where TimeGenerated >= ago(dt_lookBack)\n    | extend UrlClickEvents_TimeGenerated = TimeGenerated);\nlet ChainReportID = UrlClickEvents_\n    | mv-expand todynamic(UrlChain)\n    | extend UrlChain = tolower(UrlChain)\n    | project ReportId, Url, UrlChain;\n// Url is not always in UrlChain, so we need to check both\nlet ClickedUrls = \n  (union isfuzzy=false (ChainReportID), (ChainReportID | project Url = UrlChain))\n  | distinct Url\n  | summarize make_list(Url);\nlet TI = materialize(ThreatIntelligenceIndicator\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | where isnotempty(Url) and tolower(Url) in (ClickedUrls)\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where Active == true and ExpirationDateTime > now()\n  | project-rename TI_Url = Url, TI_Type = Type\n  );\n(union isfuzzy=false (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.UrlChain),\n  (TI | join kind=innerunique (ChainReportID) on $left.TI_Url == $right.Url))\n| project-away UrlChain\n| join kind=innerunique (UrlClickEvents_) on ReportId\n| where UrlClickEvents_TimeGenerated < ExpirationDateTime\n| summarize UrlClickEvents_TimeGenerated = arg_max(UrlClickEvents_TimeGenerated, *) by IndicatorId\n| project UrlClickEvents_TimeGenerated, AccountUpn, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, NetworkMessageId\n| extend timestamp = UrlClickEvents_TimeGenerated\n| extend timestamp = UrlClickEvents_TimeGenerated, Name = tostring(split(AccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(AccountUpn, '@', 1)[0])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}