Australian experts have warned that the Bugbear worm is still cause for concern, despite a fall in the number of reported infections over the long weekend.
Global virus activity captured by secure e-mail services company MessageLabs in November slid to half the October figure, the company said.
Australians are more susceptible to Bugbear than to most worms, with 11.7 percent of reported infections coming from this country, compared to between two and four percent for most worms, according to Symantec.
Bugbear is on the way to overtaking Klez as the most prevalent virus in Australia, this week knocking Klez off the top of security companies' "top ten" virus lists. In many cases it's the first time in several months Klez hasn't topped the list.
Half of the 10 most virulent viruses last month were 'network aware', meaning they spread using the file system protocol of an organisation, according to IT security firm Sophos.
IT departments around Australian have been battling to protect themselves from outbreaks of the Klez worm.
Rampant virus Klez, which has spawned a number of variants, is predicted to cause Australian IT professionals headaches for months to come.
Although it's still at the top of the ranks in infection rates, Klez isn't the only worm companies should be worried about.
Klez is still riding high in the virus top 10 after more than a year, but system administrators should be looking out for Datemake, a new entry.
Businesses continue to be lax about taking basic practical steps to stop e-mail worms wreaking havoc with their networks, according to anti-virus experts.
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