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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Yama.B

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Yama.B
Technical name:JS/Yama.B
Threat level:Low
Alias:I-Worm.Yama.B
Type:Trojan
Effects:  Its main aim is to change the Home page of Internet Explorer.
Detection updated on:Nov. 13, 2002
StatisticsNo

Brief Description 

    

Yama.B is a worm whose main aim is to open the web browser at the following web page: http:// www.geocities.com/ yamaperu

This worm spreads via e-mail by inserting its code in the AutoSignature of outgoing messages.

It is very easy to become infected by this worm, as it is automatically activated when the message is viewed through the Outlook Preview Pane. It does this by exploiting a vulnerability in Internet Explorer (versions 5.01 and 5.5), which allow script to be automatically run.

Visible Symptoms 

    

An indication that Yama.B has infected the computer is that the home page of the web browser (for example, Internet Explorer) is changed to:

http:// www.geocities.com/ yamaperu

Once it has carried out its infection, Yama.B displays a text in Spanish about the 2001 elections in Peru, in the web browser.