The Virus Top Twenty

Kaspersky Labs presents the Virus Top 20 for the month of May, 2003.

The percentage shown represents the percentage of registered incidences.

1

I-Worm.Sobig
21.87%

2
I-Worm.Lentin
15.95%

3
I-Worm.Klez
15.39%

4
I-Worm.Fizzer
0.67%

5
I-Worm.Roron
0.51%

6
Worm.Win32.Randon
0.38%

7
I-Worm.Ganda
0.28%

8
Macro.Word97.Thus
0.28%

9
<!–!–>Backdoor.Assasin
0.24%

10
I-Worm.Tanatos
0.21%

11
<!–!–>Backdoor.Optix
0.20%

12
Backdoor.IRC.Zcrew
0.19%

13
Win32.Parite
0.17%

14
Win32.FunLove
0.17%

15
<!–!–>Backdoor.IRC.Flood
0.16%

16
<!–!–>TrojanDropper.JS.Mimail
0.16%

17
<!–!–>VBS.Redlof
0.15%

18
<!–!–>Backdoor.IRC.mIRC-based
0.14%

19
<!–!–>Backdoor.SdBot.gen
0.12%

20
<!–!–>TrojanDownloader.Win32.Swizzor
0.12%

Other Malicious Programs*
42.66%

*not included in the Top 20

Malicious Program Types

Kaspersky researchers have discovered new Mirage Kitten attacks using previously undocumented malware families: NodeRabbit in Node.js and PollCat in JavaScript.

Our experts discovered a new CoolClient backdoor variant with a kernel-mode rootkit driver that hides malicious processes, files, and network connections from security tools and threat analysts.

Kaspersky experts break down a new Armored Likho campaign that poses as a fundraising efforts and delivers a new Still Toolkit aimed at stealing Telegram data and eavesdropping on victims.

Kaspersky researchers reveal previously undocumented malware attributed to Mirage Kitten (UNC1549, Smoke Sandstorm, Nimbus Manticore): NightLedger backdoor, ArcBridge, and BridgeHead tunneling tools.