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Top Ten Viruses Reported to Sophos in April 2005

  • 02 May, 2005 09:07

<p>Sophos, a world leader in protecting businesses against spam and viruses, has published a report revealing the top ten viruses causing problems for businesses around the world during the month of April 2005.</p>
<p>The report, compiled from Sophos's global network of monitoring stations, shows that Zafi-D, which first appeared at the end of 2004, continues its reign at the top of the list for the fifth month running, accounting for 46.6 per cent of all reports. Only one new threat – Mytob-Z –has managed to break into the chart for April, appearing in seventh place.</p>
<p>The top ten viruses in April 2005 were as follows:</p>
<p>1. W32/Zafi-D 46.6% FIFTH MONTH AT NUMBER ONE
2. W32/Netsky-P 20.6%
3. W32/Zafi-B 4.5%
3. W32/Netsky-D 4.5%
5. W32/Netsky-Z 2.5%
6. W32/Netsky-B 2.4%
7. W32/Mytob-Z 1.3% NEW ENTRY
8. W32/MyDoom-O 1.2%
9. W32/Netsky-C 1.1%
10. W32/Netsky-Q 1.0%</p>
<p>Others: 14.3%</p>
<p>"Old viruses are still taking advantage of poorly protected computers in April," said Carole Theriault, security consultant at Sophos. "The Zafi family of viruses accounts for over 50 per cent of all the viruses reported to Sophos in the last month. Perhaps the success of these worms lies in their ability to spread in multiple languages, catching out unwary users all over the world. Users should not only be suspicious of unsolicited email in any language, they should also be ensuring up-to-date anti-virus protection is in place to thump this virus family on the head.</p>
<p>"Although Mytob-Z only accounts for a small percentage of the top ten reports, it is the only new worm that has managed to break into the stronghold of old threats," continued Theriault. "First sighted in mid-April, Mytob-Z is a nasty piece of work – not only does it spread ferociously, but it plants a backdoor Trojan horse which can be used by remote hackers to gain access and control over a victim's computer. The computer can then be spied upon or used to send spam or launch denial-of-service attacks."</p>
<p>Sophos analysed and protected against 1,146 new viruses in April. The total number of viruses Sophos now protects against is 103,269.</p>
<p>Sophos research shows that 2.17 per cent, or one in 46 emails, circulating during the month of April were viral. This figure is slightly lower than last month when one in 38 emails were viral.</p>
<p>In order to minimise exposure to viruses, Sophos recommends that companies deploy a policy at their email gateway which blocks unwanted executable attachments from being sent into their organisation from the outside world. Companies should also run up-to-date anti-virus software, firewalls and install the latest security patches.</p>
<p>Sophos has made available a free, constantly updated information feed for intranets and websites which means users can always find out about the latest viruses and hoaxes:</p>
<p>Graphics of the above top ten virus chart are available at:</p>
<p>For more information about safe computing, including anti-hoax policies, please visit:</p>
<p>news ends</p>
<p>About Sophos.
Sophos is a world leading computer security specialist, developing anti-virus and anti-spam software. Headquartered in the UK, the company produces solutions tailored for businesses of all sizes – from small enterprises to global corporations. Sophos is acclaimed for delivering the highest level of customer satisfaction and protection in the industry. The company's products are sold and supported in more than 150 countries and protect more than 35 million users.</p>
<p>Sophos's regional head office for Australia and New Zealand is in Sydney and hosts one of the company's four High Security Research and Development Laboratories to provide global support services.</p>
Sean Richmond ( is available for comment:
+61 2 9409 9100 (tel)
+61 2 9409 9191 (fax)</p>
<p>Sophos's press contact at Gotley Nix Evans is:
Michael Henderson (
+61 2 9957 5555 (tel)
+61 413 054 738 (mob)
+61 2 9957 5575 (fax)</p>

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