Ubiquiti - Unusual FTP connection to external server

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Id	fd200125-9d57-4838-85ca-6430c63e4e5d
Rulename	Ubiquiti - Unusual FTP connection to external server
Description	Detects local to remote (L2R) FTP connections.
Severity	Medium
Tactics	Exfiltration CommandAndControl
Techniques	T1048 T1071.002
Required data connectors	CustomLogsAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiL2RFTP.yaml
Version	1.0.3
Arm template	fd200125-9d57-4838-85ca-6430c63e4e5d.json

KQL

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

YAML

name: Ubiquiti - Unusual FTP connection to external server
id: fd200125-9d57-4838-85ca-6430c63e4e5d
description: |
    'Detects local to remote (L2R) FTP connections.'
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
version: 1.0.3
triggerOperator: gt
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  
tactics:
- Exfiltration
- CommandAndControl
kind: Scheduled
queryFrequency: 1h
severity: Medium
queryPeriod: 1h
requiredDataConnectors:
- dataTypes:
  - Ubiquiti_CL
  connectorId: CustomLogsAma
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Ubiquiti UniFi/Analytic Rules/UbiquitiL2RFTP.yaml
relevantTechniques:
- T1048
- T1071.002

ARM