Virus Top Twenty for September 2003

Kaspersky Labs presents the twenty most widespread viruses for September 2003










































Position Change Virus Name Percentage by Occurrence
1 = I-Worm.Sobig 44.75%
2 new I-Worm.Swen 36.50%
3 – 1 I-Worm.Mimail 6.50%
4 + 1 I-Worm.Klez 2.52%
5 + 1 I-Worm.Lentin 2.35%
6 – 3 I-Worm.Tanatos 0.81%
7 new I-Worm.Dumaru 0.68%
8 – 4 Worm.Win32.Lovesan 0.35%
9 – 2 Worm.P2P.SpyBot 0.14%
10 re-entry Win95.CIH 0.11%
11 = Backdoor.SdBot 0.09%
12 re-entry I-Worm.Ganda 0.09%
13 = VBS.Redlof 0.08%
14 – 2 Win32.Parite 0.08%
15 + 4 Worm.Win32.Welchia 0.08%
16 re-entry Win32.FunLove 0.08%
17 – 1 I-Worm.Roron 0.07%
18 – 4 Backdoor.Optix.Pro 0.07%
19 re-entry I-Wom.Fizzer 0.07%
20 – 14 Macro.Word97.Thus 0.05%
Other Malicious Programs* 4.52%
* not included in the Top Twenty

Malicious Program Types

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