TI map Domain entity to PaloAlto CommonSecurityLog

let dt_lookBack = 1h; // Look back 1 hour
let ioc_lookBack = 14d; // Look back 14 days
// Create a list of top-level domains (TLDs) from the threat feed data for later validation
let SecurityLog = materialize(
  CommonSecurityLog
    // Filter common security logs based on the specified time range
    | extend IngestionTime = ingestion_time()
    | where IngestionTime > ago(dt_lookBack)
    | where DeviceEventClassID =~ 'url'
    // Uncomment the line below to only alert on allowed connections
    //| where DeviceAction !~ "block-url"
    // Extract the domain from RequestURL, if not present, extract it from AdditionalExtensions
    | extend PA_Url = column_ifexists("RequestURL", "None")
    | extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith "PanOS", extract("([^\\\"]+)", 1, tolower(AdditionalExtensions)), trim('"', PA_Url))
    | extend PA_Url = iif(PA_Url !startswith "http://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), iif(PA_Url !startswith "https://" and ApplicationProtocol =~ "ssl", strcat('https://', PA_Url), PA_Url))
    | extend Domain = trim('"', tostring(parse_url(PA_Url).Host))
    | where isnotempty(Domain)
    | extend Domain = tolower(Domain)
    | extend CommonSecurityLog_TimeGenerated = TimeGenerated
);
let LogDomains = SecurityLog | distinct Domain | summarize make_list(Domain);
// Retrieve threat intelligence indicators within the specified time range
let Domain_Indicators = materialize(
    ThreatIntelligenceIndicator
    | where isnotempty(DomainName)
    | where TimeGenerated >= ago(ioc_lookBack)
    | extend TI_DomainEntity = tolower(DomainName)
    | where TI_DomainEntity in (LogDomains)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now());
// Join threat intelligence indicators with common security logs
Domain_Indicators | join kind=innerunique (SecurityLog) on $left.TI_DomainEntity == $right.Domain
| where CommonSecurityLog_TimeGenerated < ExpirationDateTime
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId
| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
| extend timestamp = CommonSecurityLog_TimeGenerated

query: |
  let dt_lookBack = 1h; // Look back 1 hour
  let ioc_lookBack = 14d; // Look back 14 days
  // Create a list of top-level domains (TLDs) from the threat feed data for later validation
  let SecurityLog = materialize(
    CommonSecurityLog
      // Filter common security logs based on the specified time range
      | extend IngestionTime = ingestion_time()
      | where IngestionTime > ago(dt_lookBack)
      | where DeviceEventClassID =~ 'url'
      // Uncomment the line below to only alert on allowed connections
      //| where DeviceAction !~ "block-url"
      // Extract the domain from RequestURL, if not present, extract it from AdditionalExtensions
      | extend PA_Url = column_ifexists("RequestURL", "None")
      | extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith "PanOS", extract("([^\\\"]+)", 1, tolower(AdditionalExtensions)), trim('"', PA_Url))
      | extend PA_Url = iif(PA_Url !startswith "http://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), iif(PA_Url !startswith "https://" and ApplicationProtocol =~ "ssl", strcat('https://', PA_Url), PA_Url))
      | extend Domain = trim('"', tostring(parse_url(PA_Url).Host))
      | where isnotempty(Domain)
      | extend Domain = tolower(Domain)
      | extend CommonSecurityLog_TimeGenerated = TimeGenerated
  );
  let LogDomains = SecurityLog | distinct Domain | summarize make_list(Domain);
  // Retrieve threat intelligence indicators within the specified time range
  let Domain_Indicators = materialize(
      ThreatIntelligenceIndicator
      | where isnotempty(DomainName)
      | where TimeGenerated >= ago(ioc_lookBack)
      | extend TI_DomainEntity = tolower(DomainName)
      | where TI_DomainEntity in (LogDomains)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now());
  // Join threat intelligence indicators with common security logs
  Domain_Indicators | join kind=innerunique (SecurityLog) on $left.TI_DomainEntity == $right.Domain
  | where CommonSecurityLog_TimeGenerated < ExpirationDateTime
  | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId
  | project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
  | extend timestamp = CommonSecurityLog_TimeGenerated  
name: TI map Domain entity to PaloAlto CommonSecurityLog
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: DeviceName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIP
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: PA_Url
description: |
    Identifies a match in PaloAlto CommonSecurityLog table from any Domain IOC from TI
kind: Scheduled
severity: Medium
triggerThreshold: 0
queryPeriod: 14d
queryFrequency: 1h
triggerOperator: gt
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CommonSecurityLog.yaml
id: dd0a6029-ecef-4507-89c4-fc355ac52111
version: 1.4.1

{
  "$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/dd0a6029-ecef-4507-89c4-fc355ac52111')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/dd0a6029-ecef-4507-89c4-fc355ac52111')]",
      "properties": {
        "alertRuleTemplateName": "dd0a6029-ecef-4507-89c4-fc355ac52111",
        "customDetails": null,
        "description": "Identifies a match in PaloAlto CommonSecurityLog table from any Domain IOC from TI\n",
        "displayName": "TI map Domain entity to PaloAlto CommonSecurityLog",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "PA_Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_CommonSecurityLog.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour\nlet ioc_lookBack = 14d; // Look back 14 days\n// Create a list of top-level domains (TLDs) from the threat feed data for later validation\nlet SecurityLog = materialize(\n  CommonSecurityLog\n    // Filter common security logs based on the specified time range\n    | extend IngestionTime = ingestion_time()\n    | where IngestionTime > ago(dt_lookBack)\n    | where DeviceEventClassID =~ 'url'\n    // Uncomment the line below to only alert on allowed connections\n    //| where DeviceAction !~ \"block-url\"\n    // Extract the domain from RequestURL, if not present, extract it from AdditionalExtensions\n    | extend PA_Url = column_ifexists(\"RequestURL\", \"None\")\n    | extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith \"PanOS\", extract(\"([^\\\\\\\"]+)\", 1, tolower(AdditionalExtensions)), trim('\"', PA_Url))\n    | extend PA_Url = iif(PA_Url !startswith \"http://\" and ApplicationProtocol !~ \"ssl\", strcat('http://', PA_Url), iif(PA_Url !startswith \"https://\" and ApplicationProtocol =~ \"ssl\", strcat('https://', PA_Url), PA_Url))\n    | extend Domain = trim('\"', tostring(parse_url(PA_Url).Host))\n    | where isnotempty(Domain)\n    | extend Domain = tolower(Domain)\n    | extend CommonSecurityLog_TimeGenerated = TimeGenerated\n);\nlet LogDomains = SecurityLog | distinct Domain | summarize make_list(Domain);\n// Retrieve threat intelligence indicators within the specified time range\nlet Domain_Indicators = materialize(\n    ThreatIntelligenceIndicator\n    | where isnotempty(DomainName)\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | extend TI_DomainEntity = tolower(DomainName)\n    | where TI_DomainEntity in (LogDomains)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now());\n// Join threat intelligence indicators with common security logs\nDomain_Indicators | join kind=innerunique (SecurityLog) on $left.TI_DomainEntity == $right.Domain\n| where CommonSecurityLog_TimeGenerated < ExpirationDateTime\n| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId\n| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity\n| extend timestamp = CommonSecurityLog_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "templateVersion": "1.4.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}