Best answer: No, you do not require an antivirus application to be installed on your QNAP NAS. If you'd feel more comfortable using one, QNAP offers a free antivirus program available through the App Center.
[h=3]Your QNAP NAS does not need an antivirus[/h]I've not used antivirus software on any PC for more than a decade. That's not to say I believe antivirus software doesn't have a place. It's helpful for those who aren'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...