Can Linux servers get viruses, and do I need to run an antivirus on a cloud-hosted Ubuntu instance?

All answers to this question.

Linux isn't immune; it's just targeted differently. You aren't usually looking for "viruses" in the Windows sense, but for Rootkits, Web Shells, and Cryptominers. If your server allows users to upload files, an antivirus like ClamAV is mandatory to prevent your server from becoming a distributor of malware to your Windows users. For the server itself, tools like Rkhunter or Lynis are better because they check for system integrity and "backdoors." Instead of a resident real-time scanner that eats RAM, focus on "File Integrity Monitoring" (FIM) to alert you if critical system binaries like ls or ps are ever modified.

   Answered 2025-10-12 by Heather Collins

Is your server part of a larger network where it could act as a "jump box" for lateral movement if it were compromised by a basic script?

   Answered 2025-11-02 by Robert Taylor

• It is part of our production VPC, Robert. If it got hit, the attacker could potentially scan our internal databases. I’m going to implement a basic ClamAV scan for the /tmp and /var/www directories and combine it with a strict Fail2Ban policy. I think that covers the "low-hanging fruit" of Linux vulnerabilities without killing the performance of our small t3.micro instance.

     Commented 2025-11-15 by David Sterling

Most Linux "viruses" are actually just misconfigured permissions. If you harden your SSH and use non-root users, you've solved 90% of the problem.

   Answered 2025-11-30 by Barbara Wilson

• Spot on, Barbara. Antivirus is no substitute for a properly hardened SSH config and a good firewall. Security starts with the basics.

     Commented 2025-12-08 by Courtney Williams