This type of virus, which can spread itself in numerous ways including voluntary download, effectively hijacks certain browser functions, usually in the form of re-directing the user automatically to particular sites. It’s usually assumed that this tactic is designed to increase revenue from web advertisements.
There are a lot of such viruses, and they usually have “search” included somewhere in their description. CoolWebSearch may be the most well known example, but others are nearly as common.
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