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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

WmaDownlder.B

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:WmaDownlder.B
Technical name:Trj/WmaDownloader.B
Threat level:Medium
Type:Trojan
Effects:  

It downloads and installs the adware detected as ISTbar on the affected computer.

Affected platforms:

Windows XP/2000/NT/ME/98

First detected on:Dec. 12, 2005
Detection updated on:Dec. 12, 2005
StatisticsNo

Brief Description 

    

WmaDownlder.B is a Trojan that downloads and installs the adware detected as ISTbar on the affected computer.

WmaDownlder.B takes advantage of a technology of Microsoft's Windows Media Player, called Windows Media Digital Rights Management (DRM). This technology has been developed in order to protect multimedia content that holds intellectual rights.

This Trojan reaches the computer in a license-protected multimedia file. When the user attempts to view it, WmaDownlder.B connects to an URL in the domain drm.ysbweb.com and downloads the adware to the system.

However, WmaDownlder.B downloads it only if Windows Media Player 9 or later is installed on the affected computer.

Visible Symptoms 

    

WmaDownlder.B is easy to recognize, as it displays the following window when it is run:

Then, the following security warning is displayed, which indicates that an ActiveX control is going to be installed on the computer:

If it is accepted, WmaDownlder.B displays the following window: