TI map Domain entity to PaloAlto

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True);
//Create a list of TLDs in our threat feed for later validation of extracted domains
let list_tlds = ThreatIntelligenceIndicator
| where TimeGenerated > ago(ioc_lookBack)
| where isnotempty(DomainName)
| 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 = (union isfuzzy=true
(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(DomainName)
| extend TI_DomainEntity = DomainName
),
(IoCList
| where IoC_Type =~ 'domainname'
| where ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
| where Active =~ 'True'
| extend TI_DomainEntity = IoC
| project-away  IoC_Type
)
);
Domain_Indicators
// 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 (
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 extarct it from AdditionalExtentions
| extend PA_Url = columnifexists("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 parts = split(Domain, '.')
//Split out the 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 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
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain, IoC
| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, 
  DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, IoC, TI_DomainEntity
| extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, URLCustomEntity = PA_Url

version: 1.3.0
queryFrequency: 1h
requiredDataConnectors:
- connectorId: PaloAltoNetworks
  dataTypes:
  - CommonSecurityLog
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
entityMappings:
- fieldMappings:
  - columnName: HostCustomEntity
    identifier: FullName
  entityType: Host
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url
  entityType: URL
kind: Scheduled
queryPeriod: 14d
severity: Medium
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True);
  //Create a list of TLDs in our threat feed for later validation of extracted domains
  let list_tlds = ThreatIntelligenceIndicator
  | where TimeGenerated > ago(ioc_lookBack)
  | where isnotempty(DomainName)
  | 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 = (union isfuzzy=true
  (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(DomainName)
  | extend TI_DomainEntity = DomainName
  ),
  (IoCList
  | where IoC_Type =~ 'domainname'
  | where ExpirationDateTime > now()
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
  | where Active =~ 'True'
  | extend TI_DomainEntity = IoC
  | project-away  IoC_Type
  )
  );
  Domain_Indicators
  // 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 (
  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 extarct it from AdditionalExtentions
  | extend PA_Url = columnifexists("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 parts = split(Domain, '.')
  //Split out the 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 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
  | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain, IoC
  | project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, 
    DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, IoC, TI_DomainEntity
  | extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, URLCustomEntity = PA_Url  
triggerOperator: gt
id: ec21493c-2684-4acd-9bc2-696dbad72426
description: |
    'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'
triggerThreshold: 0
name: TI map Domain entity to PaloAlto
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_PaloAlto.yaml

{
  "$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/ec21493c-2684-4acd-9bc2-696dbad72426')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ec21493c-2684-4acd-9bc2-696dbad72426')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "TI map Domain entity to PaloAlto",
        "description": "'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@\"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv\"] with(format=\"csv\", ignoreFirstRecord=True);\n//Create a list of TLDs in our threat feed for later validation of extracted domains\nlet list_tlds = ThreatIntelligenceIndicator\n| where TimeGenerated > ago(ioc_lookBack)\n| where isnotempty(DomainName)\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 = (union isfuzzy=true\n(ThreatIntelligenceIndicator\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(DomainName)\n| extend TI_DomainEntity = DomainName\n),\n(IoCList\n| where IoC_Type =~ 'domainname'\n| where ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC\n| where Active =~ 'True'\n| extend TI_DomainEntity = IoC\n| project-away  IoC_Type\n)\n);\nDomain_Indicators\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 (\nCommonSecurityLog\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 extarct it from AdditionalExtentions\n| extend PA_Url = columnifexists(\"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 parts = split(Domain, '.')\n//Split out the 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 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| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain, IoC\n| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, \n  DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, IoC, TI_DomainEntity\n| extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, URLCustomEntity = PA_Url\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "alertRuleTemplateName": "ec21493c-2684-4acd-9bc2-696dbad72426",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "HostCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "URLCustomEntity"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_PaloAlto.yaml",
        "templateVersion": "1.3.0"
      }
    }
  ]
}