While working on some of the Antivirus Issue and revisiting the AV configuration in each of the SharePoint platform seen many system and log folder also being scanned by AV deployed on SharePoint servers.
MS had published a very useful KB article which gives you information and listing all those servers which can be excluded form the AV scanning on your SharePoint environment.
http://support.microsoft.com/kb/952167 Read at my Blog: http://mossnwss.blogspot.in/2014/10/folder-to-exclude-from-sharepoint.html
Though of Sharing with all you guys…!
http://support.microsoft.com/kb/952167