{
  "$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/4b451ade-ed28-48e2-8fe7-60ae83ab2fa5')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4b451ade-ed28-48e2-8fe7-60ae83ab2fa5')]",
      "properties": {
        "alertRuleTemplateName": "4b451ade-ed28-48e2-8fe7-60ae83ab2fa5",
        "customDetails": null,
        "description": "'Identifies a match in SecurityAlert table from any Email IOC from TI which will extend coverage to datatypes such as MCAS, StorageThreatProtection and many others'\n",
        "displayName": "TI Map Email entity to SecurityAlert",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "EntityEmail",
                "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%20Intelligence%20%28NEW%29/Analytic%20Rules/EmailEntity_SecurityAlert.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$';\nThreatIntelIndicators\n//Filtering the table for Email related IOCs\n| extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n| where IndicatorType == \"email-addr\"\n| extend EmailSenderAddress = ObservableValue\n| extend EmailSourceDomain = substring(EmailSenderAddress, indexof(EmailSenderAddress, \"@\") + 1, strlen(EmailSenderAddress) - indexof(EmailSenderAddress, \"@\") - 1)\n| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n| extend IndicatorId = tostring(split(Id, \"--\")[2])\n| extend Url = iff(ObservableKey == \"url:value\", ObservableValue, \"\")\n| where TimeGenerated >= ago(ioc_lookBack)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue\n| where IsActive and (ValidUntil > now() or isempty(ValidUntil))\n  | project-reorder *, TrafficLightProtocolLevel, EmailSenderAddress, EmailSourceDomain, Type\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    SecurityAlert\n    | where TimeGenerated >= ago(dt_lookBack)\n    | extend MSTI = case(AlertName has \"TI map\" and VendorName == \"Microsoft\" and ProductName == 'Azure Sentinel', true, false)\n    | where MSTI == false\n    // Converting Entities into dynamic data type and use mv-expand to unpack the array\n    | extend EntitiesDynamicArray = parse_json(Entities) | mv-expand EntitiesDynamicArray\n    // Parsing relevant entity column to filter type account and creating new column by combining account and UPNSuffix\n    | extend Entitytype = tostring(parse_json(EntitiesDynamicArray).Type), EntityName = tostring(parse_json(EntitiesDynamicArray).Name),\n    EntityUPNSuffix = tostring(parse_json(EntitiesDynamicArray).UPNSuffix)\n    | where Entitytype =~ \"account\"\n    | extend EntityEmail = tolower(strcat(EntityName, \"@\", EntityUPNSuffix))\n    | where EntityEmail matches regex emailregex\n    | extend Alert_TimeGenerated = TimeGenerated\n)\non $left.EmailSenderAddress == $right.EntityEmail\n| where Alert_TimeGenerated < ValidUntil\n| summarize Alert_TimeGenerated = arg_max(Alert_TimeGenerated, *) by Id, AlertName\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| project Alert_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,\nEmailSenderAddress, EntityEmail, AlertName, AlertType,\nAlertSeverity, Entities, ProviderName, VendorName,Url//, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, \n| extend Name = tostring(split(EntityEmail, '@', 0)[0]), UPNSuffix = tostring(split(EntityEmail, '@', 1)[0])\n| extend timestamp = Alert_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.2.12",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}