How Bad was the Sobig Viral Infection?

Just how ill did the Sobig virus make the world’s personal computers and which region were worst affected? McAfee.com, manufacture of the world’s most popular anti-virus software, reports that 6.1% of the world’s personal computers it scanned had been infected during the past 30 days of this writing, 4.1% during the past 7 days, and less than 2% during the past 24 hours.

South America was worst hit: 12.1% during the past 30 days and 7% during the past 7 days. North America suffered second worst: 8.1% during the past 30 days and 5.3% during the past 7 days. Asia suffered the least: only 0.9% of computers during the past 30 days and less than 0.6% during the past 7 days. Sobig isn’t prevalent anywhere today, according to McAfee’s tracking.

Though Sobig was the most prevalent virus that McAfee tracked during the past 30 days and was the fourth most during the past 7 days. By the way, the most prevalent virus reported by McAfee during these periods was JS/NoClose, a javascript trojan that opens a browser window that cannot easily be closed. According to McAfee, JS/NoClose is “usually associated with advertisement and banner ad programs. Especially affiliated with pornographic sites and sites which pay commissions to others for displaying banner ads.” It won’t kill a Windows PC, as Sobig will, but will aggravate you.