Type of virus

There are three kinds of virus causing troubles for any computer users: a Trojan Horse, Spyware, and Spam. First, Trojan  is created to   get credit card information or bank passwords. Second,  Spyware  compiles details about the computer owner. Third, a Spam  is used for trapping people and getting money from them ( Philpot , 2011 : p.47)

Reference:

Philpot,  S. (2011). Academic Skills. Oxford: Spain