Spyware - Anti Spyware

Spyware is a broad category of malicious software intended to intercept or take partial control of a computer's operation without the user's informed consent. While the term taken literally suggests software that surreptitiously monitors the user, it has come to refer more broadly to software that subverts the computer's operation for the benefit of a third party.

Spyware differs from viruses and worms in that it does not usually self-replicate. Like many recent viruses, spyware is designed to exploit infected computers for commercial gain. Typical tactics furthering this goal include delivery of unsolicited pop-up advertisements; theft of personal information (including financial information such as credit card numbers); monitoring of web-browsing activity for marketing purposes; or routing of HTTP requests to advertising sites.

As of 2005, spyware affects only computers running Microsoft Windows operating systems. There have been no reported observations of spyware for Mac OS X, Linux, or other platforms

History and development

The first recorded use of the term spyware occurred on October 16, 1995, in a Usenet post that poked fun at Microsoft's business model. Spyware later came to refer to espionage equipment such as tiny cameras. However, in 1999 the founder of Zone Labs, Gregor Freund, used the term in a press release for the Zone Alarm Personal Firewall. Since then, computer users have used the term in its current sense. 1999 also saw the introduction of the first popular freeware program to include built-in spyware: a humorous and popular game called "Elf Bowling" spread across the Internet in November of 1999, and many users learned with surprise that the program actually transmitted user-information back to the game's creator, Nsoft.

In 2000, Steve Gibson of Gibson Research released the first anti-spyware program, OptOut, in response to the growth of spyware, and many more software antidotes have appeared since then. International Charter now offers software developers a Spyware-Free Certification programme.

According to an October 2004 study by America Online and the National Cyber-Security Alliance, 80% of surveyed users' computers had some form of spyware, with an average of 93 spyware components per computer. 89% of surveyed users with spyware reported that they did not know of its presence, and 95% reported that they had not given permission for it to be installed.

Spyware, "adware", and tracking

The term adware frequently refers to any software which displays advertisements, whether or not it does so with the user's consent. Programs such as the Eudora mail client and the Opera Web browser display advertisements as an alternative to shareware registration fees. These classify as "adware" in the sense of advertising-supported software, but not as spyware. They do not operate surreptitiously or mislead the user.

Many of the programs frequently classified as spyware function as adware in a different sense: their chief observed behavior consists of displaying advertising. Claria Corporation's Gator provides an example of this sort of program. Visited websites frequently install Gator on client machines in a surreptitious manner, and it directs revenue to the installing site and to Claria by displaying advertisements to the user. The user's experience is that their computer begins displaying a large number of pop-up advertisements.