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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Blaster.H

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Blaster.H
Technical name:W32/Blaster.H.worm
Threat level:Low
Type:Worm
Effects:  

It opens a random port and allows to gain remote access to the affected computer.

Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95

Detection updated on:April 21, 2004
StatisticsNo

Brief Description 

    

Blaster.H is a worm that affects only Windows 2003/XP/2000/NT computers. Blaster.H exploits the Buffer Overrun in RPC Interface vulnerability to spread to as many computers as possible.

Blaster.H contains a backdoor that opens a random port and listens to it, in order to gain remote access to the affected computer.

Blaster.H spreads by attacking consecutive IP addresses and exploits the vulnerability mentioned above to download a copy of itself to the compromised computer. In order to do this, Blaster.H incorporates its own TFTP (Trivial File Transfer Protocol) server.

If you have a Windows 2003/XP/2000/NT computer, it is highly recommendable to download the security patch from the Microsoft website. Click here to access the web page for downloading the patch.

Visible Symptoms 

    

Some clear indications that Blaster.H has reached the computer are the following:

  • It increases the network traffic on the TCP ports 135 and 4444 and UDP port 69.
  • It changes the browser Internet Explorer home page to the URL http://www.getgood.biz, excepting those Windows operating systems in Russian.