{
  "$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/45b903c5-6f56-4969-af10-ae62ac709718')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/45b903c5-6f56-4969-af10-ae62ac709718')]",
      "properties": {
        "alertRuleTemplateName": "45b903c5-6f56-4969-af10-ae62ac709718",
        "customDetails": null,
        "description": "'Identifies when an RDP connection is new or rare related to any logon type by a given account today compared with the previous 14 days.\nRDP connections are indicated by the EventID 4624 with LogonType = 10'\n",
        "displayName": "Rare RDP Connections",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Account",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountNTDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/RDP_RareConnection.yaml",
        "query": "let starttime = 14d;\nlet endtime = 1d;\n(union isfuzzy=true\n(SecurityEvent\n| where TimeGenerated >= ago(endtime)\n| where EventID == 4624 and LogonType == 10\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ConnectionCount = count()\nby Account = tolower(Account), Computer = toupper(Computer), IpAddress, AccountType, Activity, LogonTypeName, ProcessName\n// use left anti to exclude anything from the previous 14 days that is not rare\n),\n(WindowsEvent\n| where TimeGenerated >= ago(endtime)\n| where EventID == 4624 and EventData has (\"10\")\n| extend LogonType = tostring(EventData.LogonType)\n| where  LogonType == 10\n| extend Account = strcat(tostring(EventData.TargetDomainName),\"\\\\\", tostring(EventData.TargetUserName))\n| extend ProcessName = tostring(EventData.ProcessName)\n| extend IpAddress = tostring(EventData.IpAddress)\n| extend TargetUserSid = tostring(EventData.TargetUserSid)\n| extend AccountType=case(Account endswith \"$\" or TargetUserSid in (\"S-1-5-18\", \"S-1-5-19\", \"S-1-5-20\"), \"Machine\", isempty(TargetUserSid), \"\", \"User\")\n| extend Activity=\"4624 - An account was successfully logged on.\"\n| extend LogonTypeName=\"10 - RemoteInteractive\"\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), ConnectionCount = count()\nby Account = tolower(Account), Computer = toupper(Computer), IpAddress, AccountType, Activity, LogonTypeName, ProcessName\n))\n| join kind=leftanti (\n(union isfuzzy=true\n(SecurityEvent\n| where TimeGenerated between (ago(starttime) .. ago(endtime))\n| where EventID == 4624\n| summarize by Computer = toupper(Computer), IpAddress, Account = tolower(Account)\n),\n( WindowsEvent\n| where TimeGenerated between (ago(starttime) .. ago(endtime))\n| where EventID == 4624\n| extend IpAddress = tostring(EventData.IpAddress)\n| extend Account = strcat(tostring(EventData.TargetDomainName),\"\\\\\", tostring(EventData.TargetUserName))\n| summarize by Computer = toupper(Computer), IpAddress, Account = tolower(Account)\n))\n) on Account, Computer\n| summarize StartTime = min(StartTime), EndTime = max(EndTime), ConnectionCount = sum(ConnectionCount)\nby Account, Computer, IpAddress, AccountType, Activity, LogonTypeName, ProcessName\n| extend HostName = tostring(split(Computer, \".\")[0]), DomainIndex = toint(indexof(Computer, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)\n| extend AccountName = tostring(split(Account, @\"\\\")[1]), AccountNTDomain = tostring(split(Account, @\"\\\")[0])\n| project-away DomainIndex\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "LateralMovement"
        ],
        "techniques": [
          "T1021"
        ],
        "templateVersion": "1.2.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}