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方案一、RuntimeEventlogAudit (ring3 plan)

通过读取windows实时日志检测RDP连接情况,其中

  • EventID = 4624, 登陆成功
  • EventID = 4625, 登陆失败 需要特殊关注

效果

方案二、WFP (ring0 plan)

使用 网络协议过滤框架,通过在FWPM_LAYER_ALE_FLOW_ESTABLISHED_V4收集对端信息,在FWPM_LAYER_STREAM_V4层进行数据包校验(在stream层单独做可能也行,没有验证),判断是不是RDP数据握手包(请求验证),基于2条规则,

  • 握手总次数(>=20次)
  • 握手频率 (>=2次/1s) 就给你安排了(block)

效果

方案对比

*RuntimeEventlogAudit

  • 优点:实现简单、反馈信息多(密码错误,账户不存在等)
  • 缺点:在批量暴力破解速率高时(单次耗时<=1s时),EventLog的读取存在延迟,这样就导致拦截不及时

*WFP

  • 优点:真实时拦截
  • 缺点:相对实现较复杂些,没有RuntimeEventlogAudit获取到的信息多,一定程度上有损网络性能

参考

https://github.com/JaredWright/WFPStarterKit [wfp]

https://github.com/raymon-tian/WFPFirewall [wfp]

bugs&其他

关于bug和其他讨论,欢迎提交issue

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