At present, Windows XP and Windows 7 on campus network and even older system versions are more toxic. The following points can be taken for prevention.
1. Install 360 security guards for detection and patch, or refer to manual patch download.
https://technet.microsoft.com/zh-cn/library/security/MS17-010
Download the corresponding patch and apply it.
2. Close port 445. Specific steps: add inbound rules to Windows Firewall to block port 445.
The above measures are only for protection. If you have been infected with a virus, please contact professional maintenance personnel to remove it. It also reminds all users to back up important files in advance, so that they are not afraid of being attacked.