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What is the point of computer viruses?
Their main purpose is to send out spam, malware and spyware. In addition to causing chaos, they also attempt to gain access to personal information such as credit card numbers, bank information and Social Security numbers.
How does a computer get a virus?
There are several ways a computer can get infected by a virus and most of them involve downloading – either intentionally or unintentionally – infected files. Pirated music or movies, photos, free games and toolbars are common culprits, as are phishing/spammy emails with attachments.
What is virus in malicious code?
Various classifications of malicious code include viruses, worms, and Trojan horses. Viruses have the ability to damage or destroy files on a computer system and are spread by sharing an already infected removable media, opening malicious email attachments, and visiting malicious web pages.
What is the first virus in the world?
Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens.
Did Bill Gates create computer viruses?
While working with the Computer Center’s PDP-10, Gates was responsible for what was probably the first computer virus, a program that copies itself into other programs and ruins data. Without the lure of computers, Gates made plans in 1970 for college and law school.
Is it illegal to write a virus?
No. It is not against the law or a crime to make a computer virus, Trojan, or malware. However, if that virus spreads to other computers intentionally or by mistake, you’ve violated the law, and you could be held liable for any damages it causes.
How does a virus attach itself to a program?
For example, a virus might attach itself to a program such as a spreadsheet program. Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to other programs) or wreak havoc.
How are computer viruses similar to biological viruses?
Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person. Unlike a cell, a virus has no way to reproduce by itself. Instead, a biological virus must inject its DNA into a cell.
What are the effects of viruses on a computer?
Viruses can range in severity from causing mildly annoying effects to damaging data or software and causing denial-of-service (DoS) conditions. Almost all viruses are attached to an executable file, which means the virus may exist on a system but will not be active or able to spread until a user runs or opens the malicious host file or program.
How does a virus spread from one computer to another?
Viruses spread when the software or document they are attached to is transferred from one computer to another using the network, a disk, file sharing, or infected email attachments. Worms. Computer worms are similar to viruses in that they replicate functional copies of themselves and can cause the same type of damage.