"Computer Virus - Knowing and Preventing the Computer Spyware, Viruses, Trojan and More"
What is a Computer Virus?
A computer virus is a small program written by human to alter the way a computer operates, without the permission or knowledge of the user. Often, it causes problems to the computer.
A virus must meet two criteria:
1) It must execute itself. It will often place its own code in the path of execution of another program.
2) It must replicate itself. For example, it may replace other executable files with a copy of the virus infected file.
Some viruses can damage the computer by altering programs, deleting files, or reformatting the hard disk. Others are not designed to do any damage, but simply to replicate themselves and make their presence known by displaying text, video, and audio messages.
Other viruses can cause your computer hardware problem, behave un-normal such as always restarting, freeze, etc. They often cause erratic behavior and can result in system crashes.
Computer viruses can spread fast and they are hard to eradicate. They can be attached to any type of file and they are spread as files copied and sent from PC to PC/laptop.
Every day new computer viruses are created to annoy us and to wreck havoc on our computer systems. Below are some of the virus examples:
Virus name: W32.Beagle.CO@mm
A mass-mailing worm that lowers security settings. It can delete security-related registry sub keys and may block access to security-related websites.
Virus name: Backdoor.Zagaban
A Trojan horse that allows the compromised computer to be used as a covert proxy and which may degrade network performance.
Virus name: W32/Zafi-B
A peer-to-peer (P2P) and email worm that will copy itself to the Windows system folder as a randomly named EXE file. This worm will test for the presence of an internet connection by attempting to connect to www.google.com or www.microsoft.com.
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