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(c)Brain (the industry standard name being Brain) is a 1987 computer virus that infects MS-DOS FAT file systems. It is a boot sector infector that moves the boot sector and replaces it with a copy of the virus. The real boot sector is moved to another sector and marked as bad. The Disk label is also changed to (c)Brain.

This virus was written by two brothers who lived in Chahmiran, Lahore, Pakistan. The brothers told TIME magazine they had written it to protect their medical software from software pirates. The virus, supposedly, was going to target copyright infringers only.

The virus came complete with the brothers' real address and phone number, and a message that said the user's machine had been infected and for inoculation the user should call them.

When they started getting a ton of phone calls from people in USA, England, and elsewhere, demanding them to disinfect their machines, the brothers were stunned and tried to explain to the outraged callers that their motivation had not been malicious. They ended up having to get their phone lines cut off and regretted that they had revealed their contact info in the first place.

The brothers are still in business in Pakistan as ISPs in their company called Brain Limited.

Businessweek magazine called the virus 'Pakistani flu'.

See also: notable computer viruses and worms

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