Best answer: No, you do not require an antivirus application to be installed on your Synology NAS. If you'd feel more comfortable using one, Synology offers a free antivirus program available through the Package Center.
[h=3]Your Synology NAS does not need an antivirus[/h]Like a desktop OS, I've never had antivirus software running on any PC I've used for more than a decade. I feel antivirus software has its place, especially if the PC owner isn't particularly careful when using the system, but a NAS really doesn't require one. You won't be visiting unknown websites on the enclosure, nor will you be downloading attachments from phishing emails.
Full story from the WindowsCentral blog...