Antivirus Definitions File

http://www.avg.com/ww-en/download-update
www.symantec.com/business/security_response/definitions/download/detail.jsp?gid=savce
www.scanwith.com/McAfee_SuperDAT_Update_download.htm
www.bkav.com.vn/home/Download.aspx
www.softpedia.com/progDownload/Avira-Antivir-Virus-Definition-File-Update-Download-82517.html
www.avast.com/eng/updates.html