18. Argentina

Share of malicious computer activity: 1%
Malicious code rank: 44
Spam zombies rank: 12
Phishing Web site hosts rank: 20
Bot rank: 12
Attack origin rank: 18

Argentina climbed the rankings in 2008 after finishing in 20th place a year earlier. One of the biggest threats facing the South American country stems from bots, or programs that let a person's computer be operated remotely, often for nefarious purposes.

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