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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Encyclopedia GetVirusCard True 0

Klez.B

 
Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Klez.B
Technical name:W32/Klez.B
Threat level:Low
Alias:Troj/Klez.B,, TROJ_KLEZ.B, KLEZ.B, W32.Klez
Type:Worm
Effects:  It drops the Elkern.A virus in the affected computer.

Affected platforms:

Windows XP/2000/NT/ME/98/95

Detection updated on:Oct. 31, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies
Family:KLEZ

Brief Description 

    

Klez.B is a worm that reaches computers in an e-mail message in HTML with a variable subject. The most common subjects are: Hi, Hello, How are you? or Can you help me?.

Klez.B carries out its infection when the e-mail attachment is run, carrying out the following actions:

  • It automatically and rapidly spreads to all the contacts in the Address Book. It can send several infected messages to the same user.
  • It drops the Elkern.A virus in the affected computer.
>

Visible Symptoms 

    

Klez.B is difficult to recognize because it is hidden in e-mail messages with variable characteristics. The most common subjects are:

Hi

Hello

How are you?

Can you help me?

For more information consult the section Means of transmission.