Suspicious Failed Logon From Public IP (via security)

title: Suspicious Failed Logon From Public IP (via security)
id: ee4dfa8d-8b4c-50e4-a8b5-f1b36ebc8353
status: stable
description: This rule detects a failed logon attempt from a public IP. A login from a public IP can indicate a misconfigured firewall or network boundary.
references:
    - https://attack.mitre.org/techniques/T1133/
    - https://attack.mitre.org/techniques/T1190/
    - https://attack.mitre.org/techniques/T1078/
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4625
author: Huntrule Team
date: 2026-04-22
tags:
    - attack.privilege-escalation
    - attack.initial-access
    - attack.persistence
    - attack.stealth
    - attack.t1078
    - attack.t1190
    - attack.t1133
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4625
    filter_main_ip_unknown:
        IpAddress|contains: '-'
    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'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium