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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Block-checker

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Block-checker
Technical name:Adware/Block-checker
Threat level:Low
Alias:BlockChecker
Type:Spyware
Subtype: Adware
Effects:  

It sends advertising messages to the Contact List of several instant messaging programs, it downloads other adware programs from a certain web page and it adds several web pages to the user's browser History. It is distributed via several instant messaging programs.

Affected platforms:

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

First detected on:Aug. 30, 2005
Detection updated on:Oct. 11, 2006
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Block-checker is an adware program that sends advertising messages to the Contact List of several instant messaging programs, such as MSN Messenger, Yahoo Messenger and AOL Messenger.

Additionally, it downloads other adware programs from the web page http://www.systsses.com and adds several web pages to the user's browser History.

Block-checker is distributed via several instant messaging programs, such as MSN Messenger, Yahoo Messenger and AOL Messenger.

Visible Symptoms 

    

Block-checker is easy to recognize once it has affected the computer, as it displays the following image on screen when it is run: