How difficult is it to get malware on Linux, and how should I scan for it?

A lot depends on how the computer is exposed. Keep unnecessary services closed, avoid forwarding ports unless you need them, secure SSH, and do not run unknown commands as root. If you suspect a real compromise, look beyond an antivirus scan: check unexpected processes, listening ports, systemd services and timers, cron jobs, SSH keys, user accounts, authentication logs, and unusual network activity.

ClamAV can be useful for scanning downloaded files, particularly if you share them with Windows users or run a file server. It is not a complete security solution, though, and a clean result does not prove that the system is uncompromised. rkhunter can provide additional checks, but it may produce false positives and should not replace updates, sensible permissions, and monitoring.

Desktop Linux malware exists, but it is relatively uncommon. The biggest protections are keeping the system and browser updated, installing software from your distribution's official repositories, avoiding random binaries and scripts, and being especially cautious before using sudo. Linux is not magically immune—if you download and run cracked software, an untrusted script, or a malicious package, you can still compromise the machine.

Linux is targeted less often on personal desktops partly because Windows has a much larger user base, but that is a matter of probability rather than immunity. Supply-chain attacks and compromised third-party packages can affect Linux too, so stick to trustworthy sources and review installation instructions instead of blindly copying commands from the internet.

Using Windows software through Wine does not make it safe. A malicious Windows program can still damage files inside your Wine environment and potentially affect anything your user account can access. Treat programs run through compatibility layers, containers, or virtual machines as untrusted unless you understand the isolation and risks.