Antivirus function TS-5000
Latest firmware (after Ver.2.10) corresponds Antivirus function.
Old firmware (before Ver.2.10) does not have Antivirus function.
TS5000 Series Firmware Updater Version 2.20 release note
Version 2.10 [2012.08.20]
Added and modified features
[Virus scanning - Equipped with "Trend Micro NAS Security (TM)" by Trend Micro for virus scanning.
Extended virus scanning update licenses are available separately (OP-TSVC-5Y, OP-TSVC-3Y, and OP-TSVC-1Y).
http://buffalo.jp/support_s/guide2/manual/ts/02/en/manual.html