Suspicious External Remote RDP Logon from Public IP (via security)

title: Suspicious External Remote RDP Logon from Public IP (via security)
id: 40f6bd13-589e-5d7a-8600-bfa5876659ea
status: stable
description: This rule detects successful logon from public IP address via RDP. This can indicate a publicly-exposed RDP port.
references:
    - https://attack.mitre.org/techniques/T1110/
    - https://attack.mitre.org/techniques/T1078/
    - https://attack.mitre.org/techniques/T1133/
    - https://www.inversecos.com/2020/04/successful-4624-anonymous-logons-to.html
    - https://twitter.com/Purp1eW0lf/status/1616144561965002752
author: Huntrule Team
date: 2026-05-23
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.credential-access
    - attack.stealth
    - attack.t1133
    - attack.t1078
    - attack.t1110
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4624
        LogonType: 10
    filter_main_local_ranges:
        IpAddress|cidr:
            - '::1/128'
            - '10.0.0.0/8'
            - '127.0.0.0/8'
            - '172.16.0.0/12'
            - '192.168.0.0/16'
            - '169.254.0.0/16'
            - 'fc00::/7'
            - 'fe80::/10'
    filter_main_empty:
        IpAddress: '-'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium