When this replication succeeds, the affected areas are then said to be “infected”, making your device helpless and sick. If your computer has a virus, it will more than likely begin showing certain symptoms which will indicate that it has a virus, as well as, what type of virus it may be. Were I an Iranian scientist Flame would definitely be in my top 5 Virus, Trojan and Worm selections; since I am not, here is my top 5. This virus performs many criminal works by infecting a windows computer using Trojan horse. This virus was identified in 2009. Back in March 1999, the Melissa virus was so powerful that it forced Microsoft and a number of other very large companies to completely turn off their e-mail systems until the virus could be contained. Definition: A computer virus is a malicious software program loaded onto a user’s computer without the user’s knowledge and performs malicious actions. Computer virus truly means a nightmare for every computer user. Sometimes the damage is minor but often it can be disastrous. Hence, the detection of virus becomes very difficult. If it is a virus that contaminated a network of equipment, remove the malware will be a demanding task, since it can be transmitted from an infected computer to a healthy computer in a matter of seconds, expanding the range of action of the virus. Common examples of boot virus are AntiEXE and Polyboot.B. Computer viruses take many different shapes and forms, and the damage they do ranges from mildly annoying to damaging an entire country’s nuclear program. Others : Other persons my indicate computer teachers, IT consultants, IT Journalists, Bloggers etc also computer virus sample. The Concept virus was instead spread, accidentally, by professional firms. But you should care about viruses even if you don’t have above causes. It opened a dialog window that told users a system shutdown was imminent. Klez - This virus was unique in that hackers reproduced in many forms. Microsoft itself was partly responsible when it shipped Windows 95 Software Compatability Test CD-ROMs containing the virus. Released in late 2001. Having AntiVirus software will protect your computer from the common virus. Computer virus protection. Some computer viruses are programmed to harm your computer by damaging programs, others work by deleting files or reformatting your computer… 10% of the world’s computers were believed to have been infected. Stealth Virus : It is a very tricky virus as it changes the code that can be used to detect it. Jerusalem, the first known computer worm, was discovered in 1987. * What is Computer Virus? Since then, other computer worms have made the news, either because of their devastating effects or due to the sheer scale of the attack. This virus infected hundreds of thousands of computers through a vulnerability hole in Windows 2000 and Windows XP. It spreads by duplicating and attaching itself to files. Description: The term 'computer virus' was first formally defined by Fred Cohen in 1983.Computer viruses never occur naturally. For this reason, be sure your anti-virus program updates automatically and at a reasonable time (not 3am on Wednesday nights . Examples of Antivirus After discussing the types of premium antivirus software, it is time to discuss the example of a free antivirus software. For example, if the virus was directed to the memory of the computer, it is possible that the data stored there is lost forever. When the user can fill all of his details and this virus can track all the details. Looking for an essay-friendly definition? There is a quotation by the author of www.vxheaven.com is “ Viruses don’t harm, Ignorance does! Top 20 Most-Destructive Computer Viruses Ever The word “Computer Virus” really scares all computer … Real sentences showing how to use Computer virus correctly. The ILOVEYOU virus is one example of this type of virus which hides in a document or spreadsheet. ILOVEYOU is considered one of the most virulent computer virus ever created. These virus attacks can prevent you from accessing certain parts of the drive where important files might have been stored. See examples of Computer virus in English. This virus installs to a computer's memory and can infect any number of files - from those near where it's located in the computer to files on an entire computer network at a business. * Countermeasures Against Computer Virus. Some of the most notorious examples of computer … These types of viruses are macro or binary. A Word file was uploaded to the Usenet discussion group, alt.sex in March 1999. * Symptoms of a Computer Virus. Now you understood why virus samples are useful. A computer virus definition, Wikipedia-style. Distributed through e-mail. not likely that your computer will be turned on during that time). 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