Ubiquiti - Unusual FTP connection to external server

let allowed_ftp = dynamic(['127.0.0.2']);
UbiquitiAuditEvent
| where EventCategory == 'firewall'
| where ipv4_is_private(SrcIpAddr)
| where ipv4_is_private(DstIpAddr) == 'False'
| where DstPortNumber in ('20', '21')
| where DstIpAddr !in (allowed_ftp)
| extend IPCustomEntity = SrcIpAddr

description: |
    'Detects local to remote (L2R) FTP connections.'
queryFrequency: 1h
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
queryPeriod: 1h
query: |
  let allowed_ftp = dynamic(['127.0.0.2']);
  UbiquitiAuditEvent
  | where EventCategory == 'firewall'
  | where ipv4_is_private(SrcIpAddr)
  | where ipv4_is_private(DstIpAddr) == 'False'
  | where DstPortNumber in ('20', '21')
  | where DstIpAddr !in (allowed_ftp)
  | extend IPCustomEntity = SrcIpAddr  
status: Available
id: fd200125-9d57-4838-85ca-6430c63e4e5d
name: Ubiquiti - Unusual FTP connection to external server
kind: Scheduled
version: 1.0.3
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiL2RFTP.yaml
triggerThreshold: 0
triggerOperator: gt
tactics:
- Exfiltration
- CommandAndControl
relevantTechniques:
- T1048
- T1071.002
requiredDataConnectors:
- connectorId: CustomLogsAma
  dataTypes:
  - Ubiquiti_CL

{
  "$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/fd200125-9d57-4838-85ca-6430c63e4e5d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/fd200125-9d57-4838-85ca-6430c63e4e5d')]",
      "properties": {
        "alertRuleTemplateName": "fd200125-9d57-4838-85ca-6430c63e4e5d",
        "customDetails": null,
        "description": "'Detects local to remote (L2R) FTP connections.'\n",
        "displayName": "Ubiquiti - Unusual FTP connection to external server",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiL2RFTP.yaml",
        "query": "let allowed_ftp = dynamic(['127.0.0.2']);\nUbiquitiAuditEvent\n| where EventCategory == 'firewall'\n| where ipv4_is_private(SrcIpAddr)\n| where ipv4_is_private(DstIpAddr) == 'False'\n| where DstPortNumber in ('20', '21')\n| where DstIpAddr !in (allowed_ftp)\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1071.002"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl",
          "Exfiltration"
        ],
        "techniques": [
          "T1048",
          "T1071"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}