Evolution of Upatre Trojan Downloader

Upatre is a Trojan Downloader family that once installed, is responsible for stealing information and downloading additional malware on the victim machine. It typically arrives via spammed e-mail messages from the Cutwail Botnet, either as an attachment, or via a URL pointing to a remote hosting site. We are also seeing Exploit Kits being used as a vector for Upatre infections in the wild.

more here......http://research.zscaler.com/2014/11/evolution-of-upatre-trojan-downloader.html