Incidents involving the malicious code, also known as "bot" code, reached 13,000 from April through June, according to a report from antivirus-software maker McAfee. That's quadruple the number tracked by the company in the previous three months. McAfee estimated that 63 percent more machines were exploited by bot programs and by spyware and adware--their slightly less insidious, but more common, cousins--in the first six months of this year than in the whole of last year.

Computer security experts have identified zombie networks, or networks of systems with bot software installed, as a rising threat to consumers and businesses. The programs spread to vulnerable computers via chat room servers and file-sharing networks, experts said, and often go undetected by the PCs' owners.

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