AutoCAD 2013/AutoCAD LT 2013 SP1 helps combat malware
UPDATE 2012-09-12: The update has been reposted as Service Pack 1.1 UPDATE 2012-08-24: Posted on the download page today: “Service Pack 1 for AutoCAD 2013 has been temporarily removed due to a newly discovered fatal error. The AutoCAD team is actively working on resolving this and a new service