TI Map URL Entity to AuditLogs

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(Url)
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
  AuditLogs
  | where TimeGenerated >= ago(dt_lookBack)
  // Extract the URL that is contained within the JSON data
  | extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,tostring(TargetResources))
  | where isnotempty(Url)
  | extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)
  | extend Audit_TimeGenerated = TimeGenerated
) on Url
| where Audit_TimeGenerated < ExpirationDateTime
| summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url
| project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
OperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url
| extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url

kind: Scheduled
triggerOperator: gt
queryFrequency: 1h
name: TI Map URL Entity to AuditLogs
queryPeriod: 14d
id: 712fab52-2a7d-401e-a08c-ff939cc7c25e
description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in AuditLogs.'
severity: Medium
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true
  // Picking up only IOC's that contain the entities we want
  | where isnotempty(Url)
  // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  | join kind=innerunique (
    AuditLogs
    | where TimeGenerated >= ago(dt_lookBack)
    // Extract the URL that is contained within the JSON data
    | extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,tostring(TargetResources))
    | where isnotempty(Url)
    | extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)
    | extend Audit_TimeGenerated = TimeGenerated
  ) on Url
  | where Audit_TimeGenerated < ExpirationDateTime
  | summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url
  | project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
  OperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url
  | extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url  
version: 1.2.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_AuditLogs.yaml
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: URLCustomEntity
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
tactics:
- Impact
triggerThreshold: 0

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/712fab52-2a7d-401e-a08c-ff939cc7c25e')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/712fab52-2a7d-401e-a08c-ff939cc7c25e')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "TI Map URL Entity to AuditLogs",
        "description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in AuditLogs.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true\n// Picking up only IOC's that contain the entities we want\n| where isnotempty(Url)\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n  AuditLogs\n  | where TimeGenerated >= ago(dt_lookBack)\n  // Extract the URL that is contained within the JSON data\n  | extend Url = extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);\", 1,tostring(TargetResources))\n  | where isnotempty(Url)\n  | extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)\n  | extend Audit_TimeGenerated = TimeGenerated\n) on Url\n| where Audit_TimeGenerated < ExpirationDateTime\n| summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url\n| project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,\nOperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url\n| extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "alertRuleTemplateName": "712fab52-2a7d-401e-a08c-ff939cc7c25e",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "HostCustomEntity"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "URLCustomEntity"
              }
            ],
            "entityType": "URL"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_AuditLogs.yaml",
        "templateVersion": "1.2.4"
      }
    }
  ]
}