More than 2.2 million US PCs were found to be part of botnets, networks of hijacked home computers, in the first six months of 2010.
Hi-tech criminals use botnets to send out spam...
Compiled by Microsoft, the research revealed that Brazil had the second highest level of infections at 550,000.
Infections were highest in South Korea where 14.6 out of every 1000 machines were found to be enrolled in botnets.
Source: BBC
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