The Virus Top Twenty - September 2003

01 Oct 2003
Virus News


Kaspersky Lab presents the twenty most widespread viruses for September 2003
PositionChangeVirus NamePercentage by Occurrence
1=I-Worm.Sobig44.75%
2newI-Worm.Swen36.50%
3- 1I-Worm.Mimail6.50%
4+ 1I-Worm.Klez2.52%
5+ 1 I-Worm.Lentin 2.35%
6- 3 I-Worm.Tanatos 0.81%
7new I-Worm.Dumaru 0.68%
8- 4 Worm.Win32.Lovesan 0.35%
9- 2Worm.P2P.SpyBot0.14%
10re-entry Win95.CIH 0.11%
11= Backdoor.SdBot 0.09%
12re-entry I-Worm.Ganda 0.09%
13= VBS.Redlof 0.08%
14- 2 Win32.Parite 0.08%
15+ 4 Worm.Win32.Welchia 0.08%
16re-entry Win32.FunLove 0.08%
17- 1 I-Worm.Roron 0.07%
18- 4 Backdoor.Optix.Pro 0.07%
19re-entry I-Wom.Fizzer 0.07%
20- 140.05%
Other Malicious Programs*4.52%
* not included in the Top Twenty
Malicious Program Types