6. Trojan Downloaders And Droppers
Trojan downloaders and droppers made up 10.4 percent of detections in the fourth quarter of 2012. The activity was driven by infections of Swisyn, a family of Trojans that drops and executes malicious code on a victim's machine. Swisyn has been connected to keyloggers, worms and other malware types that attempt to record keystrokes, steal data and gain access to network drives and other systems.