Net security threats growing fast (old news - 06:45AM Monday Sep 20 2004)
More than 30,000 PCs per day are being recruited into secret networks that spread spam and viruses, a study shows.
Six months ago only 2,000 Windows machines per day were being recruited into these so-called bot nets.
Experts say the numbers are growing quickly because the remotely controlled networks are so useful to people who profit from hacking and virus writing.
The figures came to light in Symantec's biannual Internet Threat Report which traces trends in net security.
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