If you want to get your malicious software loaded on 1,000 U.S. computers, it will cost you about $100, or a dime each, on the black market. Getting your malware on 1,000 machines in Asian countries will cost you only $5.
These infected computers—collectively known as botnets—can be used to send spam, steal passwords or other private information, and hack into corporate computer systems. Researchers estimate that five million computers around the world were infected just in the first quarter of 2012.
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