TI map Domain entity to PaloAlto

let dt_lookBack = 1h;  // Duration to look back for recent logs (1 hour)
let ioc_lookBack = 14d;  // Duration to look back for recent threat intelligence indicators (14 days)
// Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains
let list_tlds = 
    ThreatIntelligenceIndicator
    | where isnotempty(DomainName)
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
    | extend DomainName = tolower(DomainName)
    | extend parts = split(DomainName, '.')
    | extend tld = parts[(array_length(parts)-1)]
    | summarize count() by tostring(tld)
    | summarize make_list(tld);
let Domain_Indicators = 
    ThreatIntelligenceIndicator
    // Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)
    | where isnotempty(DomainName)
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
    | extend TI_DomainEntity = DomainName;
Domain_Indicators
    // Join with CommonSecurityLog to find potential malicious activity
    | join kind=innerunique (
        CommonSecurityLog
        | extend IngestionTime = ingestion_time()
        | where IngestionTime > ago(dt_lookBack)
        | where DeviceVendor =~ 'Palo Alto Networks'
        | where DeviceEventClassID =~ 'url'
        // Uncomment the line below to only alert on allowed connections
        // | where DeviceAction !~ "block-url"
        // Extract domain from RequestURL, if not present, extract it from AdditionalExtensions
        | extend PA_Url = coalesce(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 !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "http://" and PA_Url !startswith "https://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), PA_Url)
        | extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and 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 parts = split(Domain, '.')
        // Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on
        | extend tld = parts[(array_length(parts)-1)]
        // Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match
        | where tld in~ (list_tlds)
        | extend CommonSecurityLog_TimeGenerated = TimeGenerated
    ) on $left.TI_DomainEntity == $right.Domain
    | where CommonSecurityLog_TimeGenerated < ExpirationDateTime
    // Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated
    | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain
    // Select the desired fields for the final result set
    | project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
    // Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value
    | extend timestamp = CommonSecurityLog_TimeGenerated

relevantTechniques:
- T1071
name: TI map Domain entity to PaloAlto
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: PaloAltoNetworks
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
entityMappings:
- fieldMappings:
  - identifier: HostName
    columnName: DeviceName
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: SourceIP
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: PA_Url
  entityType: URL
triggerThreshold: 0
id: ec21493c-2684-4acd-9bc2-696dbad72426
tactics:
- CommandAndControl
version: 1.4.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_PaloAlto.yaml
queryPeriod: 14d
kind: Scheduled
queryFrequency: 1h
severity: Medium
description: |
    'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'
query: |
  let dt_lookBack = 1h;  // Duration to look back for recent logs (1 hour)
  let ioc_lookBack = 14d;  // Duration to look back for recent threat intelligence indicators (14 days)
  // Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains
  let list_tlds = 
      ThreatIntelligenceIndicator
      | where isnotempty(DomainName)
      | where TimeGenerated >= ago(ioc_lookBack)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now()
      | extend DomainName = tolower(DomainName)
      | extend parts = split(DomainName, '.')
      | extend tld = parts[(array_length(parts)-1)]
      | summarize count() by tostring(tld)
      | summarize make_list(tld);
  let Domain_Indicators = 
      ThreatIntelligenceIndicator
      // Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)
      | where isnotempty(DomainName)
      | where TimeGenerated >= ago(ioc_lookBack)
      | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
      | where Active == true and ExpirationDateTime > now()
      | extend TI_DomainEntity = DomainName;
  Domain_Indicators
      // Join with CommonSecurityLog to find potential malicious activity
      | join kind=innerunique (
          CommonSecurityLog
          | extend IngestionTime = ingestion_time()
          | where IngestionTime > ago(dt_lookBack)
          | where DeviceVendor =~ 'Palo Alto Networks'
          | where DeviceEventClassID =~ 'url'
          // Uncomment the line below to only alert on allowed connections
          // | where DeviceAction !~ "block-url"
          // Extract domain from RequestURL, if not present, extract it from AdditionalExtensions
          | extend PA_Url = coalesce(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 !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "http://" and PA_Url !startswith "https://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), PA_Url)
          | extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and 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 parts = split(Domain, '.')
          // Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on
          | extend tld = parts[(array_length(parts)-1)]
          // Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match
          | where tld in~ (list_tlds)
          | extend CommonSecurityLog_TimeGenerated = TimeGenerated
      ) on $left.TI_DomainEntity == $right.Domain
      | where CommonSecurityLog_TimeGenerated < ExpirationDateTime
      // Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated
      | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain
      // Select the desired fields for the final result set
      | project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
      // Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value
      | extend timestamp = CommonSecurityLog_TimeGenerated  
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/ec21493c-2684-4acd-9bc2-696dbad72426')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ec21493c-2684-4acd-9bc2-696dbad72426')]",
      "properties": {
        "alertRuleTemplateName": "ec21493c-2684-4acd-9bc2-696dbad72426",
        "customDetails": null,
        "description": "'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'\n",
        "displayName": "TI map Domain entity to PaloAlto",
        "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_PaloAlto.yaml",
        "query": "let dt_lookBack = 1h;  // Duration to look back for recent logs (1 hour)\nlet ioc_lookBack = 14d;  // Duration to look back for recent threat intelligence indicators (14 days)\n// Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains\nlet list_tlds = \n    ThreatIntelligenceIndicator\n    | where isnotempty(DomainName)\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now()\n    | extend DomainName = tolower(DomainName)\n    | extend parts = split(DomainName, '.')\n    | extend tld = parts[(array_length(parts)-1)]\n    | summarize count() by tostring(tld)\n    | summarize make_list(tld);\nlet Domain_Indicators = \n    ThreatIntelligenceIndicator\n    // Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)\n    | where isnotempty(DomainName)\n    | where TimeGenerated >= ago(ioc_lookBack)\n    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n    | where Active == true and ExpirationDateTime > now()\n    | extend TI_DomainEntity = DomainName;\nDomain_Indicators\n    // Join with CommonSecurityLog to find potential malicious activity\n    | join kind=innerunique (\n        CommonSecurityLog\n        | extend IngestionTime = ingestion_time()\n        | where IngestionTime > ago(dt_lookBack)\n        | where DeviceVendor =~ 'Palo Alto Networks'\n        | where DeviceEventClassID =~ 'url'\n        // Uncomment the line below to only alert on allowed connections\n        // | where DeviceAction !~ \"block-url\"\n        // Extract domain from RequestURL, if not present, extract it from AdditionalExtensions\n        | extend PA_Url = coalesce(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 !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith \"http://\" and PA_Url !startswith \"https://\" and ApplicationProtocol !~ \"ssl\", strcat('http://', PA_Url), PA_Url)\n        | extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and 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 parts = split(Domain, '.')\n        // Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on\n        | extend tld = parts[(array_length(parts)-1)]\n        // Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match\n        | where tld in~ (list_tlds)\n        | extend CommonSecurityLog_TimeGenerated = TimeGenerated\n    ) on $left.TI_DomainEntity == $right.Domain\n    | where CommonSecurityLog_TimeGenerated < ExpirationDateTime\n    // Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated\n    | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain\n    // Select the desired fields for the final result set\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    // Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value\n    | extend timestamp = CommonSecurityLog_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.4.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}