{
  "$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/826f930c-2f25-4508-8e75-a95b809a4e15')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/826f930c-2f25-4508-8e75-a95b809a4e15')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Communication was observed over port {{AlertTimeDstPort}} using protocol {{AlertTimeProtocol}}, which is different from the protocol observed during the learning period. This could indicate potential malicious activity such as C2 communication or data exfiltration.",
          "alertDisplayNameFormat": "Abnormal Port to Protocol Communication Detected from {{SourceIp}} to {{Fqdn}}"
        },
        "alertRuleTemplateName": "826f930c-2f25-4508-8e75-a95b809a4e15",
        "customDetails": {
          "AbnormalPort": "AlertTimeDstPort",
          "NetworkProtocol": "AlertTimeProtocol"
        },
        "description": "'Identifies communication for well known protocol over a non-standard port based on learning period activity. This can indicate malicious communication (C2) or exfiltration by attackers trying to communicate over known ports (22:SSH, 80:HTTP) but dont use the known protocol headers to match the port number.\n\nConfigurable Parameters:\n\n- Learning period time - learning period for protocol learning in days. Default is set to 7.'\n",
        "displayName": "Abnormal Port to Protocol",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIp",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Fqdn",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure%20Firewall/Analytic%20Rules/Azure%20Firewall%20-%20Abnormal%20Port%20to%20Protocol.yaml",
        "query": "let LearningPeriod = 7d;\nlet RunTime = 1h;\nlet StartLearningPeriod = LearningPeriod + RunTime;\nlet DetectionWindowStart = ago(RunTime);\nlet LearningPortToProtocol1 =  (AzureDiagnostics\n| where TimeGenerated between (ago(StartLearningPeriod) .. ago(RunTime))\n| where OperationName == \"AzureFirewallApplicationRuleLog\"\n| extend msg_s= column_ifexists('msg_s',Message)\n| parse msg_s with Protocol \" request from \" SourceIp \":\" SourcePort:int \" to \" Fqdn \":\" DestinationPort:int \".\" *\n| where isnotempty(DestinationPort)\n| summarize LearningTimeCount = count() by LearningTimeDstPort = DestinationPort, LearningTimeProtocol = Protocol, SourceIp, Fqdn);\nlet LearningPortToProtocol2 = (AZFWNetworkRule\n| where TimeGenerated between (ago(StartLearningPeriod) .. ago(RunTime))\n| where isnotempty(DestinationPort)\n| extend Fqdn = DestinationIp\n| summarize LearningTimeCount = count() by LearningTimeDstPort = DestinationPort, LearningTimeProtocol = Protocol, SourceIp, Fqdn);\nlet LearningPortToProtocol3 = (AZFWApplicationRule\n| where TimeGenerated between (ago(StartLearningPeriod) .. ago(RunTime))\n| where isnotempty(DestinationPort)\n| summarize LearningTimeCount = count() by LearningTimeDstPort = DestinationPort, LearningTimeProtocol = Protocol, SourceIp, Fqdn);\nlet AlertTimePortToProtocol1 = (AzureDiagnostics\n| where TimeGenerated between (DetectionWindowStart .. now())\n| where OperationName == \"AzureFirewallApplicationRuleLog\"\n| extend msg_s= column_ifexists('msg_s',Message)\n| parse msg_s with Protocol \" request from \" SourceIp \":\" SourcePort \" to \" Fqdn \":\" DestinationPort:int \".\" *\n| where isnotempty(DestinationPort)\n| summarize AlertTimeCount = count() by AlertTimeDstPort = DestinationPort, AlertTimeProtocol = Protocol);\nlet AlertTimePortToProtocol2 = (AZFWNetworkRule\n| where TimeGenerated between (DetectionWindowStart .. now())\n| where isnotempty(DestinationPort)\n| extend Fqdn = DestinationIp\n| summarize AlertTimeCount = count() by AlertTimeDstPort = DestinationPort, AlertTimeProtocol = Protocol);\nlet AlertTimePortToProtocol3 = (AZFWApplicationRule\n| where TimeGenerated between (DetectionWindowStart .. now())\n| where isnotempty(DestinationPort)\n| summarize AlertTimeCount = count() by AlertTimeDstPort = DestinationPort, AlertTimeProtocol = Protocol);\n(union isfuzzy=true \n(AlertTimePortToProtocol1 \n| join kind=leftouter (LearningPortToProtocol1) on $left.AlertTimeDstPort == $right.LearningTimeDstPort\n| where LearningTimeProtocol != AlertTimeProtocol),\n(AlertTimePortToProtocol2 \n| join kind=leftouter (LearningPortToProtocol2) on $left.AlertTimeDstPort == $right.LearningTimeDstPort\n| where LearningTimeProtocol != AlertTimeProtocol),\n(AlertTimePortToProtocol3 \n| join kind=leftouter (LearningPortToProtocol3) on $left.AlertTimeDstPort == $right.LearningTimeDstPort\n| where LearningTimeProtocol != AlertTimeProtocol))\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P8D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl",
          "DefenseEvasion",
          "Exfiltration"
        ],
        "techniques": [
          "T1041",
          "T1571",
          "T1572"
        ],
        "templateVersion": "1.1.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}