The prolific Sobig-F virus stopped spreading today, marking the end of arguably the worst single email-borne viral epidemic to date.
Managed services firm MessageLabs blocked the virus a staggering 16.5 million times during its month-long spread. At the height of the epidemic, one in 17 emails the firm scanned were viral (other companies say the situation was even worse).
Sobig-F, first detected on 18 August, is the sixth variant issued in the Sobig series and appears to be the most sophisticated to date, according to MessageLabs. Like earlier versions of the virus it was programmed to stop spreading on a set date: for Sobig-F this date was September 10.
Although Sobig-F isn't spreading any more, infected machines still need to be identified and decontaminated.