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To keep track visit the Wildlist, a list which reports virus sightings. Chess of IBM’s High Integrity Computing Laboratory reported in the November 1991 Virus Bulletin that “about 30 different viruses and variants account for nearly all of the actual infections that we see in day-to-day operation.” In late 2007, about 580 different viruses, worms, and Trojans (and some of these are members of a single family) account for all the virus-related malware that actually spread in the wild. Many of the large number of viruses known to exist have not been detected in the wild but probably exist only in someone’s virus collection.ĭavid M. At least one vendor counted this as 33 different viruses on their list. One example, the Whale (an early, huge, clumsy 10,000 byte virus), creates 33 different versions of itself when it infects files. These viruses are known as polymorphic viruses. In other words, every time the virus infects another file, it will try to use a different version of itself. More confusion arises with some companies counting viruses+worms+Trojans as a unit and some not.Īnother problem comes from viruses that try to conceal themselves from scanners by mutating. But, this is a trivial change that can be done in less than two minutes resulting in yet another “new” virus. Is this a new virus? Most experts say yes.
New viruses frequently arise from someone taking an existing virus that does something like put a message out on your screen saying: “Your PC is now stoned” and changing it to say something like “Donald Duck is a lie!”.
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The confusion exists partly because it’s difficult to agree on how to count viruses.
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Indeed, in April 2008, the BBC reported that Symantec now claims “that the security firm’s anti-virus programs detect to 1,122,311” viruses and that “almost two thirds of all malicious code threats currently detected were created during 2007.” In mid-1994, the numbers vary from 4,500 to over 7,500 viruses. In late 1992, estimates were ranging from 1,000 to 2,300 viruses. In 1990, estimates ranged from 200 to 500 then in 1991 estimates ranged from 600 to 1,000 different viruses.
Estimates of exactly how many there are vary widely and the number is constantly growing. Fortunately, only a small percentage of these are circulating widely.There are more MS-DOS/Windows viruses than all other types of viruses combined (by a large margin). Sophos, in a print ad in June 2005 claims “over 103,000 viruses.” And, Symantec, in April 2008 is reported to have claimed the number is over one million. There were over 50,000 computer viruses in 2000 and that number was then and still is growing rapidly.
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