Cluster Virus

What Does Cluster Virus Mean?

A cluster virus is a type of virus that ties its own execution to the execution of various software programs. These viruses typically work by changing directory or registry entries so that when someone starts a program, the virus will start as well.


Techopedia Explains Cluster Virus

Experts call this type of virus a cluster virus partly because it can load various directory pointers that make it look like every program on a disk is infected with the virus, when in fact, only one copy of the virus exists.

Experienced users can sometimes get around a cluster virus using the checkdisk utility and other elements of the operating system to diagnose and remove the virus. However, less savvy users can end up erasing vital program information through the use of operating system prompts.

One prominent example of a cluster virus is the Dir-2 virus. This is sometimes classified as a "stealth" virus because of some of its natural protections. This virus is commonly attributed to Bulgaria, and attacks various types of executable files.


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Margaret Rouse

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.