sigmamediumHunting

External Remote RDP Logon from Public IP

Detects successful logon from public IP address via RDP. This can indicate a publicly-exposed RDP port.

MITRE ATT&CK

privilege-escalationpersistencedefense-evasioninitial-accesscredential-access

Detection Query

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_*

Author

Micah Babinski (@micahbabinski), Zach Mathis (@yamatosecurity)

Created

2023-01-19

Data Sources

windowssecurity

Platforms

windows

References

Tags

attack.privilege-escalationattack.persistenceattack.defense-evasionattack.initial-accessattack.credential-accessattack.t1133attack.t1078attack.t1110

Raw Content

title: External Remote RDP Logon from Public IP
id: 259a9cdf-c4dd-4fa2-b243-2269e5ab18a2
related:
    - id: 78d5cab4-557e-454f-9fb9-a222bd0d5edc
      type: derived
status: test
description: Detects successful logon from public IP address via RDP. This can indicate a publicly-exposed RDP port.
references:
    - https://www.inversecos.com/2020/04/successful-4624-anonymous-logons-to.html
    - https://twitter.com/Purp1eW0lf/status/1616144561965002752
author: Micah Babinski (@micahbabinski), Zach Mathis (@yamatosecurity)
date: 2023-01-19
modified: 2024-03-11
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.defense-evasion
    - attack.initial-access
    - attack.credential-access
    - 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'  # IPv6 loopback
            - '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'  # IPv6 private addresses
            - 'fe80::/10'  # IPv6 link-local addresses
    filter_main_empty:
        IpAddress: '-'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Legitimate or intentional inbound connections from public IP addresses on the RDP port.
level: medium