Trojan.BHO.cs is a Trojan application that spreads via email spam. Trojan.BHO.cs embeds itself on Internet Explorer as Browser Helper Objects (BHO) to observe and log user's browsing habits. Trojan.BHO.cs may also log keystrokes to steal confidential information. In addition, Trojan.BHO.cs will display large amounts of annoying ads and redirect your browser to certain websites. (via)