Hello,
I can help you to troubleshoot your existing Debian server's login system and resolve all types of issues with remove all infected files. I'll provide the best working environment without any errors and ensure you will not face any similar issues in the future.
I have 8 years of experience and knowledge as a System administrator, setup and management of different Linux Web Hosting Servers, Cloud Servers, Server Monitoring, Server Security, Server Optimisation, Mailing Servers, Email Marketing, AWS, Cloud, Azure servers, SSL, DNS, Apache, Nginx, etc with Cpanel, Plesk, Virtualmin or other Panels.
Please initiate a chat session for further discussion about your task, then I'll start it now.
Thank You.