In the last decade, substantial progress has been made in Internet and web-based technologies. Applications related to education, health care, banking, or even social actions between individuals and groups, can highly benefit with the use of these technologies. However, computer attacks can drastically compromise web users’ privacy. The spreading of Spyware in Internet applications is a proper example. We analyze in this paper the Spyware menace for compromising the security and privacy of web browser resources.