Almost 28% of computers with installed security protection scanned at the Infected or Not website last week were infected with some kind of malicious code.
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As for computers with no protection installed, the infection rate was 40%, said Panda Security, which runs the site.
MyWebSearch is a Pup (Potentially Unwanted Program) that installs a toolbar that changes results displayed by some search engines to redirect users to certain vendors' web pages.
There were eight Pups among the top ten malicious pieces of code detected by TotalScan.
Luis Corrons, technical director at PandaLabs, said, "One of the reasons for the widespread distribution of this type of malware is the fact that many users think it is harmless. However, it poses a threat to their privacy, and some malware is capable of downloading other types of malicious code, including Trojans, on to infected systems."
Position Malware type Name
1 Pup MyWebSearch
2 Pup FunWeb
3 Pup KillApp.B
4 Pup HideWindow.S
5 Pup Processor
6 Adware CWS
7 Worm ZLFake.A.drp
8 Adware WhenUSearch
9 Pup RealSpy
10 Pup CloseApp