Mimail virus variants have taken out five of the top ten spots in a new Sophos virus report of the most prolific viruses affecting businesses last month.
The latest list compiled by antivirus vendor Sophos found several variants of the Mimail mass mailing virus were reported during November, the most common being the Mimail-C and Mimail-F variants (each recording 9.5 per cent of reports made to Sophos).
The W32/Sober-A worm variant, which entered the vendor's virus list for the first time last month, was the most frequently occurring virus, representing 32.6 per cent of the total number of viruses reported.
But despite the significance of the Sober-A worm internationally, Australians remained largely unaffected by the worm, Sophos said.
"Although the bilingual Sober worm has resulted in the largest number of virus reports globally, Australian users do not seem to have fallen for the poorly worded enticements, resulting in very few infections being reported," Sophos's Technical Support Manager for Australia and New Zealand Sean Richmond said.
Other viruses featured in last month's list included the W32/Dumaro virus (representing 8 per cent of the total number of viruses reported), the W32/Gibe-F virus (4.5 per cent) and the W32/Nachi-A worm (2.6 per cent).
The W32/Klez-H worm, which has affected businesses globally for the past 22 months, was the ninth most received virus in November at 1.5 per cent.
Sophos also recorded the top ten hoaxes reported over November. Of these, the Hotmail hoax proved the most prevelant, accounting for 31.3 per cent of hoaxes reported. Other hoaxes on the top ten list included Meninas da Playboy (12.7 per cent), Bonsai Kitten (6.2 per cent) and the Budweiser frog screensaver (4.7 per cent).