TI map Domain entity to EmailUrlInfo

let dt_lookBack = 1h; // Define the lookback period for email data as 1 hour
let ioc_lookBack = 14d; // Define the lookback period for threat intelligence data as 14 days
let EmailUrlInfo_ = EmailUrlInfo
| where isnotempty(Url) or isnotempty(UrlDomain) // Filter for non-empty URLs or URL domains
| where TimeGenerated >= ago(dt_lookBack) // Filter for records within the lookback period
| extend Url = tolower(Url), UrlDomain = tolower(UrlDomain) // Convert URLs and domains to lowercase
| extend EmailUrlInfo_TimeGenerated = TimeGenerated; // Create a new column for the time generated
let EmailEvents_ = EmailEvents
| where TimeGenerated >= ago(dt_lookBack); // Filter email events within the lookback period
let TI_Urls = ThreatIntelIndicators
| where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
| extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
| where isnotempty(IndicatorType) and IndicatorType == "url"
| extend Url = ObservableValue
| where isnotempty(Url) // Filter for non-empty URLs
| extend Url = tolower(Url) // Convert URLs to lowercase
| join kind=innerunique (EmailUrlInfo_) on Url // Join with email URL info on URL
| where IsActive == true and ValidUntil > now() // Filter for active indicators that haven't expired
| where EmailUrlInfo_TimeGenerated < ValidUntil // Ensure email info was generated before the indicator expired
| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by Id, Url // Get the latest email info for each indicator
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract("ActivityGroup:([^,]+)", 1, tostring(parse_json(Data).labels))
| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, Url, UrlLocation, NetworkMessageId; // Select relevant columns
let TI_Domains = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
| where isnotempty(DomainName) // Filter for non-empty domain names
| extend DomainName = tolower(DomainName) // Convert domain names to lowercase
| extend IndicatorId = tostring(split(IndicatorId, "--")[2]);
TI_Domains
| project-reorder *, Active, Tags, TrafficLightProtocolLevel, DomainName, Url, Type
| join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain // Join with email URL info on domain name
| where Active == true and ExpirationDateTime > now() // Filter for active indicators that haven't expired
| where EmailUrlInfo_TimeGenerated < ExpirationDateTime // Ensure email info was generated before the indicator expired
| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, UrlDomain // Get the latest email info for each indicator
| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, UrlDomain, UrlLocation, NetworkMessageId; // Select relevant columns
union TI_Urls, TI_Domains // Combine URL and domain threat intelligence data
| extend timestamp = EmailUrlInfo_TimeGenerated // Add a timestamp column
| join kind=inner (EmailEvents_) on NetworkMessageId // Join with email events on network message ID
| where DeliveryAction !has "Blocked" // Filter out blocked delivery actions
| extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0]); // Extract name and UPN suffix from recipient email address

triggerThreshold: 0
severity: Medium
tactics:
- InitialAccess
relevantTechniques:
- T1566
queryFrequency: 1h
triggerOperator: gt
kind: Scheduled
version: 1.0.3
requiredDataConnectors:
- dataTypes:
  - EmailUrlInfo
  connectorId: Office365
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
description: |
    'Identifies a match in EmailUrlInfo table from any Domain IOC from TI.'
id: b56e2290-c65b-45a5-9636-3651e85bbe5d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/DomainEntity_EmailUrlInfo_Updated.yaml
query: |
  let dt_lookBack = 1h; // Define the lookback period for email data as 1 hour
  let ioc_lookBack = 14d; // Define the lookback period for threat intelligence data as 14 days
  let EmailUrlInfo_ = EmailUrlInfo
  | where isnotempty(Url) or isnotempty(UrlDomain) // Filter for non-empty URLs or URL domains
  | where TimeGenerated >= ago(dt_lookBack) // Filter for records within the lookback period
  | extend Url = tolower(Url), UrlDomain = tolower(UrlDomain) // Convert URLs and domains to lowercase
  | extend EmailUrlInfo_TimeGenerated = TimeGenerated; // Create a new column for the time generated
  let EmailEvents_ = EmailEvents
  | where TimeGenerated >= ago(dt_lookBack); // Filter email events within the lookback period
  let TI_Urls = ThreatIntelIndicators
  | where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
  | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
  | where isnotempty(IndicatorType) and IndicatorType == "url"
  | extend Url = ObservableValue
  | where isnotempty(Url) // Filter for non-empty URLs
  | extend Url = tolower(Url) // Convert URLs to lowercase
  | join kind=innerunique (EmailUrlInfo_) on Url // Join with email URL info on URL
  | where IsActive == true and ValidUntil > now() // Filter for active indicators that haven't expired
  | where EmailUrlInfo_TimeGenerated < ValidUntil // Ensure email info was generated before the indicator expired
  | summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by Id, Url // Get the latest email info for each indicator
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract("ActivityGroup:([^,]+)", 1, tostring(parse_json(Data).labels))
  | project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, Url, UrlLocation, NetworkMessageId; // Select relevant columns
  let TI_Domains = ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
  | where isnotempty(DomainName) // Filter for non-empty domain names
  | extend DomainName = tolower(DomainName) // Convert domain names to lowercase
  | extend IndicatorId = tostring(split(IndicatorId, "--")[2]);
  TI_Domains
  | project-reorder *, Active, Tags, TrafficLightProtocolLevel, DomainName, Url, Type
  | join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain // Join with email URL info on domain name
  | where Active == true and ExpirationDateTime > now() // Filter for active indicators that haven't expired
  | where EmailUrlInfo_TimeGenerated < ExpirationDateTime // Ensure email info was generated before the indicator expired
  | summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, UrlDomain // Get the latest email info for each indicator
  | project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, UrlDomain, UrlLocation, NetworkMessageId; // Select relevant columns
  union TI_Urls, TI_Domains // Combine URL and domain threat intelligence data
  | extend timestamp = EmailUrlInfo_TimeGenerated // Add a timestamp column
  | join kind=inner (EmailEvents_) on NetworkMessageId // Join with email events on network message ID
  | where DeliveryAction !has "Blocked" // Filter out blocked delivery actions
  | extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0]); // Extract name and UPN suffix from recipient email address  
entityMappings:
- fieldMappings:
  - columnName: RecipientEmailAddress
    identifier: FullName
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: Url
    identifier: Url
  entityType: URL
queryPeriod: 14d
name: TI map Domain entity to EmailUrlInfo

{
  "$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/b56e2290-c65b-45a5-9636-3651e85bbe5d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b56e2290-c65b-45a5-9636-3651e85bbe5d')]",
      "properties": {
        "alertRuleTemplateName": "b56e2290-c65b-45a5-9636-3651e85bbe5d",
        "customDetails": null,
        "description": "'Identifies a match in EmailUrlInfo table from any Domain IOC from TI.'\n",
        "displayName": "TI map Domain entity to EmailUrlInfo",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "RecipientEmailAddress",
                "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 (NEW)/Analytic Rules/DomainEntity_EmailUrlInfo_Updated.yaml",
        "query": "let dt_lookBack = 1h; // Define the lookback period for email data as 1 hour\nlet ioc_lookBack = 14d; // Define the lookback period for threat intelligence data as 14 days\nlet EmailUrlInfo_ = EmailUrlInfo\n| where isnotempty(Url) or isnotempty(UrlDomain) // Filter for non-empty URLs or URL domains\n| where TimeGenerated >= ago(dt_lookBack) // Filter for records within the lookback period\n| extend Url = tolower(Url), UrlDomain = tolower(UrlDomain) // Convert URLs and domains to lowercase\n| extend EmailUrlInfo_TimeGenerated = TimeGenerated; // Create a new column for the time generated\nlet EmailEvents_ = EmailEvents\n| where TimeGenerated >= ago(dt_lookBack); // Filter email events within the lookback period\nlet TI_Urls = ThreatIntelIndicators\n| where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period\n| extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n| where isnotempty(IndicatorType) and IndicatorType == \"url\"\n| extend Url = ObservableValue\n| where isnotempty(Url) // Filter for non-empty URLs\n| extend Url = tolower(Url) // Convert URLs to lowercase\n| join kind=innerunique (EmailUrlInfo_) on Url // Join with email URL info on URL\n| where IsActive == true and ValidUntil > now() // Filter for active indicators that haven't expired\n| where EmailUrlInfo_TimeGenerated < ValidUntil // Ensure email info was generated before the indicator expired\n| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by Id, Url // Get the latest email info for each indicator\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(\"ActivityGroup:([^,]+)\", 1, tostring(parse_json(Data).labels))\n| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence, Url, UrlLocation, NetworkMessageId; // Select relevant columns\nlet TI_Domains = ThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period\n| where isnotempty(DomainName) // Filter for non-empty domain names\n| extend DomainName = tolower(DomainName) // Convert domain names to lowercase\n| extend IndicatorId = tostring(split(IndicatorId, \"--\")[2]);\nTI_Domains\n| project-reorder *, Active, Tags, TrafficLightProtocolLevel, DomainName, Url, Type\n| join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain // Join with email URL info on domain name\n| where Active == true and ExpirationDateTime > now() // Filter for active indicators that haven't expired\n| where EmailUrlInfo_TimeGenerated < ExpirationDateTime // Ensure email info was generated before the indicator expired\n| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, UrlDomain // Get the latest email info for each indicator\n| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, UrlDomain, UrlLocation, NetworkMessageId; // Select relevant columns\nunion TI_Urls, TI_Domains // Combine URL and domain threat intelligence data\n| extend timestamp = EmailUrlInfo_TimeGenerated // Add a timestamp column\n| join kind=inner (EmailEvents_) on NetworkMessageId // Join with email events on network message ID\n| where DeliveryAction !has \"Blocked\" // Filter out blocked delivery actions\n| extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0]); // Extract name and UPN suffix from recipient email address\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}