"More than six million computers world wide are now part of a "bot network", reported security firm Symantec.
Computer users typically do not know that their PC has been hijacked.
More than a third of all computer attacks in the second half of 2006 originated from PCs in the United States, the threat report said.
While the total number of bot-net PCs rose, the number of servers controlling them dropped by about 25% to 4,700, the twice-yearly report said.
Symantec researchers said the decrease showed that bot network owners were consolidating to expand their networks, creating a more centralised structure for launching attacks."
-'Surge' in hijacked PC networks
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