Panda Software, leading developer of antivirus software, has published the list of the ten viruses most frequently detected and eliminated throughout January by the company’s free, online virus scanner, Panda ActiveScan. Here’s how they stack up:

1.) W32/Badtrans.B 22.49%

2.) W32/Sircam 10.64%

3.) W32/Nimda 6.83%

4.) W32/Magistr.B 6.48%

5.) W32/Klez.F 6.12%

6.) VBS/Help 4.57%

7.) W32/Disemboweler4.40%

8.) W32/[email protected] 3.28%

9.) W32/Hai 3.15%

10.) W32/Aliz 2.70%


Badtrans.B stole the march on all the rest in January and was responsible for over 22 percent of cases. The mass-mailing worm’s capacity to exploit a vulnerability in Internet Explorer and run automatically when the message carrying it is viewed in the preview pane has no doubt contributed to its virulence.

Sircam was a long way off in second place this month. However, its use of ‘social engineering’ techniques still meant it was responsible for more than 10 percent of detected infections.

Nimda, another virus that exploits software vulnerabilities, rose to third position accounting for nearly seven percent of January’s infections.

The dangerous polymorphic virus Magistr.B also took up residence in user’s computers, accounting for 6.48% of infections. A similar infection rate was registered by Klez.F, with 6.12%.

Behind this group are two other persistent viruses, which have appeared in the ranking for the last few months, Help (known as Haptime) and Disemboweler, causing 4.57% and 4.40%, of infections.

The virus Myparty also figures in the list, which despite initial expectations, has not caused a widespread epidemic. In fact, it was only detected in 3.28% of cases, taking eighth place in the ranking.

At the bottom of the table are Hai, a malicious code that mainly spreads through local networks, which accounted for 3.15% of the infections detected and Aliz, another worm that exploits a software vulnerability to infect computers and propagate.

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