International Journal of Scientific & Engineering Research
Malicious program is a serious threat for the security components such as confidentiality, integrity and availability. These new malicious executables are created at the rate of thousands every year. There are several types of threat to violate these components; for example Viruses, Worms, Trojan horse and spyware. Spyware represents a serious threat to confidentiality since it may result in loss of control over private data for computer users. Unlike viruses and worms, spyware does not usually self-replicate. It is typically hidden from the user and difficult to detect since it can create significant unwanted CPU activity, disk usage and network traffic.