Viruses and Malware

What are computer viruses and worms?


Short for malicious software, it is intended to damage or disable computers and computer systems.


A program which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as CDs, USB drives, floppy disks, etc., often causing damage to systems and data.


A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers. Often, it uses a computer network to spread itself. This is due to security shortcomings on the target computer. Unlike a computer virus, it does not need to attach itself to an existing program. Worms almost always cause at least some harm to the network, even if only by consuming bandwidth, whereas viruses almost always corrupt or modify files on a targeted computer.

Trojan Horses:

A Trojan horse, or Trojan, is a standalone malicious file or program that does not attempt to inject itself into other files unlike a computer virus and often masquerades as a legitimate file or program. Trojan horses can make copies of themselves, steal information, or harm their host computer systems.


If you are an MBL Staff Member or Researcher and believe that your computer has a virus or are just looking to have Anti-Virus Software loaded onto your computer please contact the MBL IT HelpDesk.