![]() This blurs the traditional distinction between viruses and Trojan horses. Older Trojan horses could not transmit themselves, but more recent versions can. Some Trojan horses even masquerade as repair tools, claiming to remove threats from your computer but actually doing the opposite. For more information, see the Wikipedia page on Computer virus.Ī Trojan horse is a program that appears to be useful or entertaining, but it carries a hidden malicious function that is activated when the program is run. As a whole, they are less common now than in the past. Many viruses are merely annoyances, but some can be very destructive. Some viruses are designed to change themselves slightly in order to make their detection and removal more difficult. It can be transmitted only if its host file or program is transmitted. ![]() Here are some distinguishing characteristics:Ī virus is a relatively small file that can copy itself into another file or program (its host). Viruses have been around longer than the others, and consequently the term “virus” is commonly but inaccurately used to refer to all of them. Viruses, worms, Trojan horses and related computer threats are commonly confused with each other because they often cause similar damage.
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