E-mail security firm MessageLabs said Friday that Sobig was the third most active virus in November, with some 264,000 copies being detected by its e-mail virus-scanning servers.
Although this activity is well below the virus's peak, it is still surprising as Sobig--like several other members of the Sobig family--contained a built-in shutdown date that was supposed to prevent it propagating after Sept. 10. Sobig.F's continued proliferation is due to a combination of factors, including the successful efforts that prevented it wreaking even more havoc and the fact that many PCs are set to the wrong date, according to MessageLabs.
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