{
  "$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/99ae4d06-d352-4926-a1d7-9c28e25b1313')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/99ae4d06-d352-4926-a1d7-9c28e25b1313')]",
      "properties": {
        "alertRuleTemplateName": "99ae4d06-d352-4926-a1d7-9c28e25b1313",
        "customDetails": null,
        "description": "'Identifies a match in Syslog data from any malicious URL indicator ingested from PRODAFT\nUSTA IoC Threat Intelligence (SourceSystem starting with \"PRODAFT USTA\").'\n",
        "displayName": "PRODAFT USTA - TI map URL to Syslog",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "HostIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PRODAFT%20USTA%20-%20IoC%20Threat%20Intelligence/Analytic%20Rules/TIMapUrlToSyslog.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelIndicators\n// Each USTA IoC feed uploads under its own SourceSystem (\"PRODAFT USTA - Malicious URLs\", etc.)\n| where SourceSystem startswith \"PRODAFT USTA\"\n// ObservableKey is a STIX kv pair (\"url:value\") - take the type before the colon\n| extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n| where IndicatorType == \"url\"\n| extend Url = ObservableValue\n| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\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 *, Tags, TrafficLightProtocolLevel, Url, Type\n// innerunique: one match per indicator is enough to alert, and it keeps the join cheap\n| join kind=innerunique (\n  Syslog\n  | where TimeGenerated >= ago(dt_lookBack)\n  // Pull the first URL out of the free-text message; rows without one drop out of the join\n  | extend Url = extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)\", 1,SyslogMessage)\n  | extend Syslog_TimeGenerated = TimeGenerated\n) on Url\n// non-expiring indicators are allowed above, so they must survive this filter too\n| where isempty(ValidUntil) or Syslog_TimeGenerated < ValidUntil\n| summarize Syslog_TimeGenerated  = arg_max(Syslog_TimeGenerated , *) by Id, Url\n| extend Description = tostring(parse_json(Data).description)\n| extend IndicatorTags = tostring(parse_json(Data).labels)\n| project timestamp = Syslog_TimeGenerated, Description, IndicatorTags, Id, Type, ValidUntil, Confidence, SyslogMessage, Computer, ProcessName, Url, HostIP\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}