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Add rule detecting inbound SSH drops on MikroTik WAN #6105

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Add rule detecting inbound SSH drops on MikroTik WAN #6105

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21 changes: 21 additions & 0 deletions rules/network/net_firewall_mikrotik_ssh_drop.yml
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title: MikroTik Inbound SSH Drop on WAN
id: 9b1c5e42-7a8d-43f1-b924-a12c8b7f3d64
status: experimental
description: Detects inbound SSH traffic arriving on the external WAN interface that was dropped by the router's firewall rules. This is typically indicative of automated internet scanning.
author: OriolesMagic333
date: 2026-07-02
logsource:
category: firewall
product: mikrotik
detection:
selection:
in_interface|contains: 'WAN'
dst_port: 22
protocol: 'TCP'
message|contains: 'DROP'
condition: selection
falsepositives:
- Internet background radiation (expected behavior on public IPs)
level: low
tags:
- attack.t1046 # Network Service Discovery