Not really, because it's a loanword so usually the rules of the source language would apply (although we're really not consistent with that). The "regular" German plural would be "Virusse" (which is sometimes used but sounds very ... unsophisticated).

But I'm not invested enough right now to figure that one out, especially since the answer is probably: "For some reason enough people agreed that this was the correct form and that's why." Just like the process of deciding which grammatical gender a loanword from a language without grammatical genders should get is surprisingly random and can cause long and heated discussions.