

Notorious computer virus attacks users’ files The malicious program is now targeting online consumers and businesses via email attachments which block access to a computer system until money is paid as ransom.
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For example, some can infect files without increasing their sizes, while others try to evade detection by killing the tasks associated with the antivirus software before they can be detected. Some viruses use different stealth strategies to avoid their detection from anti-virus software. Viruses spread when the software or documents they get attached to are transferred from one computer to another using a network, a disk, file sharing methods, or through infected e-mail attachments.
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Some viruses wreak havoc as soon as their code is executed, while others lie dormant until a particular event (as programmed) gets initiated, that causes their code to run in the computer.

However, most of them perform actions that are malicious in nature, such as destroying data. Not all computer viruses are destructive though. It can self-replicate, inserting itself onto other programs or files, infecting them in the process. After entering a computer, a virus attaches itself to another program in such a way that execution of the host program triggers the action of the virus simultaneously. Once created and released, however, their diffusion is not directly under human control. Definition: A computer virus is a malicious software program loaded onto a user’s computer without the user’s knowledge and performs malicious actions.ĭescription: The term 'computer virus' was first formally defined by Fred Cohen in 1983.
