Many of the popular Windows antivirus programs have a Linux equivalent (F-Secure, Sophos, ESET NOD32, Comodo, F-PROT). But more often than not these do little more than scan for signatures of Windows viruses. This doesn’t mean they should be disregarded outright!
If you use Wine to run Windows programs then you could inadvertently use it to run Windows malware. Also, if you run an email server then it’s absolutely in your interests to scan incoming messages for Windows threats. Even if you don’t, maybe you’d rather know if that file you can’t remember downloading contains a Windows nasty, and maybe you’d feel safer scanning it from Linux.
We’re going to look at what appears to be the only open source antivirus software, ClamAV.
Many popular Linux distributions include a nearly latest up-to-date version of ClamAV on repositories, or you can compile it yourself if you’re feeling brave enough. But generally speaking you’re also fine with an older version since it will still download up-to-date virus database definitions.