From the day computer was invented, the notorious minds are busy countering the development and create havoc. The malicious programs written by them to cause widespread damage to computers across the world are known as virus. During the early days these programs were aimed towards stand alone PCs as there were very less number of privileged people having access to Internet and only a fraction of the PCs were part of network. As the computing technology improved and Internet played a major role in people’s life, the virus creators aimed attacking through Internet to cause more damage in lesser time. especially the last decade has seen enormous amount of damage caused due to VIRUS. Here I have listed the 10 most notorious virus attacks till date.

Elk Cloner (1982)

Elk Cloner is regarded as the first virus to hit personal computers worldwide, “Elk Cloner” spread through Apple II floppy disks. The program was authored by Rich Skrenta, a ninth-grade student then, who wanted to play a joke on his schoolmates. The virus was put on a gaming disk, which could be used 49 times. On 50th time, instead of starting the game, it opened a blank screen that read a poem: “Elk Cloner:  The program with a personality” It will get on all your disks. It will infiltrate your chips. Yes it’s Cloner! It will stick to you like glue. It will modify RAM too. Send in the Cloner!” The computer would then be infected. Elk Cloner was though a self-replicating virus like most other viruses, it bore little resemblance to the malicious programmes of today.

Brain (1986)

Brain was the first virus to hit computers running Microsoft’s then popular operating system MS-DOS. The virus was written by two Pakistani brothers, Basit Farooq Alvi and his brother Amjad Farooq Alvi and left the phone number of their computer repair shop. A boot-sector virus, Brain infected the boot records of 360K floppy disks. The virus would fill unused space on the floppy disk so that it could not be used. The first “stealth” virus, it hid itself from any detection by disguising the infected space on the disk. Due to its partial non-destructiveness, Brain often went undetected as many times users paid little attention to the slow speed of floppy disk access. The virus was also known as Lahore, Pakistani and Pakistani Brain. BusinessWeek magazine called the virus the Pakistani flu. The brothers told TIME magazine they had written it to protect their medical software from piracy and it was supposed to target copyright infringers only.

Morris (1988)

Written by a Cornell University graduate student, Robert Tappan Morris, the virus infected an estimated 6,000 university and military computers connected over the Internet. Incidentally, Morris’s father was a top government computer-security expert, The computers Morris invaded were part of the Arpanet, an international grid of telephone lines, buried cables, and satellite hookups established by the Department of Defense in 1969. Interestingly, Morris later claimed that the worm was not written to cause damage, but to gauge the size of the Internet. An unintended consequence of the code, however, led to the damage caused.

CIH (1998)

Chernobyl virus also known as CIH or Spacefiller was first detected in 1998, however, it first triggered in April 1999, 13th the anniversary of the Chernobyl nuclear disaster (which took place in Ukrainian). It was conceived by a University graduate from Taiwan called Chen Ing Hau (CIH). One of the most harmful viruses, it overwrites critical information on infected system drives. The virus was reportedly the first virus known to have the power to damage computer hardware, with virus attempting to erase the hard drive and overwrite the system’s BIOS as well. The virus is also known as “space filler virus,” due to its ability to clandestinely take up file space on computers and prevent anti-virus software from running. The malicious program caused widespread damage in several Asian countries paralyzing thousands of computers.

Melissa (1999)

‘Melissa’ was one of the first viruses to spread over email. When users opened an attachment, the virus sent copies of itself to the first 50 people in the user’s address book, covering the globe within hours. The virus known as Melissa — believed to have been named after a Florida stripper its creator David L. Smith knew, caused more than $80m in damage after it was launched in March 1999. Computers became infected when users received a particular e-mail and opened a Word document attached to it. First found on March 26, 1999, Melissa shut down Internet mail systems at several enterprises across the world after being they got clogged with infected e-mails carrying the worm. The worm was first distributed in the Usenet discussion group alt.sex. The creator of the virus, David Smith, was sentenced to 20 months imprisonment by a United States court.

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