Webroot, which makes end-user and enterprise editions of Spy Sweeper, used its relationship with Internet service provider EarthLink to tally the most prevalent spyware, then selected the worst based on its knowledge of how each works and the damage it can cause. We use the P-I index," said Richard Stiennon, Webroot's vice president of threat research. "P is for prevalence, I is for insidiousness." Each of the ten spyware programs cited by Webroot was spotted at least 50,000 times in the scans that the Boulder, Colo.-based vendor does free of charge on its own Web site, or in conjunction with EarthLink.
Some of the software in Webroot's top 10 may be familiar to users, but most is a blur of anonymous titles that don't impart their potential impact.
Among the former is Gator (also known as GAIN), long infamous because it's bundled with the popular Kazaa peer-to-peer file sharing software. Gator/GAIN, said Webroot, made the top 10 list because it spews banner ads based on your surfing habits.
Others on the list, however, are unknown to all but the most dedicated follower of spyware. They include such programs as PurityScan, which puts up pop-up ads and tricks users into installation by claiming to find and delete porn on the PC; CoolWebSearch, which can hijack searches, browser home page, and IE's settings; and Perfect Keylogger, a spy that records all visited sites, keystrokes, and mouse clicks to, for instance, divine passwords, account numbers, and other sensitive information.
The rest of the list is fleshed out with the likes of n-CASE and KeenValue (adware), TIBS Dialer (software the usurps the modem and dials toll numbers, typically porn pay-by-the-minute phone sites), Transponder and ISTbar/AUpdate (spyware posing as browser assistants), and Internet Optimizer, which hijacks Web errors and re-directs them to its own site.
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