It is said that virus hides itself
in computer files causes difficulties for any users. These can be classified
into three types. Firstly, a Trojan Horse that stores account information.
Secondly, a Spyware that concealed inside a computer and gathers data
of the computer's owner. Lastly, a Spam that used for tricking and getting money from people whose the computer
belongs to (Philpot, 2011: 47).
References
: Philpot, S. (2011). “Computers under Attack.” Academic Skills. Oxford:
Spain
