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Sober-N worm topped the chart as Zafi-D dropped to second place last month: Sophos

Network security vendor Sophos Inc. has published a report revealing the top 10 viruses and hoaxes causing problems...


June 1, 2005  


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Network security vendor Sophos Inc. has published a report revealing the top 10 viruses and hoaxes causing problems for businesses around the world in May.

The report, which was compiled by SophosLabs, the company’s global network of virus and spam analysis centres, reveals that the new Sober-N worm surpassed Zafi-D, which had dominated the top of the virus chart for the past five months.

The bilingual Sober-N worm, which poses as tickets for the 2006 World Cup in Germany, was detected at the beginning of the month and rapidly spread across 40 countries — accounting for 4.5% of all email.

The top 10 viruses in May 2005 were as follows:

1 W32/Sober-N 43.8% New entry
2 W32/Zafi-D 14.5%
3 W32/Netsky-P 13.1%
4 W32/Netsky-D 3.1%
5 W32/Zafi-B 2.0%
6 W32/Mytob-AZ 1.6% New Entry
7 W32/Mytob-Z 1.5%
7 W32/Netsky-Z 1.5%
7 W32/Mytob-E 1.5%
10 32/Netsky-N 1.4%

Others 16.0%

“In May, we saw a lot of activity surrounding Sober-N as it cunningly climbed the chart by using social engineering tricks, such as offering free World Cup tickets, to lure recipients into opening the infected attachment,” said Gregg Mastoras, senior security analyst at Sophos.

“The Sober-Q Trojan searched for computers infected with the Sober-N worm and attempted to secretly turn them into spamming machines, better known as zombies. Sophos customers were proactively protected against Sober-Q due to Sophos’Genotype(TM) technology.”

Research revealed that that 2.62%, or one in 38 emails, circulating during the month of May were viral — a small increase over the previous month.