Before vigilante hackers like Anonymous tamed the internet, two brothers started their own fight against software piracy. Their weapon: the first PC virus.Twenty-five years ago, students at the University of Delaware began experiencing strange symptoms: temporary memory loss, a lethargic drive, and fits of rage. This wasn't just any old flu -it was the world's first personal computer virus. Known as Brain, the bug destroyed memory, slowed the hard drive, and hid a short copyright message in the boot sector, introducing the world to two soon-to-be hacker celebrities.In 1986, coders Basit and Amjad Farooq Alvi were just 17 and 24, respectively, running a computer store in Lahore, Pakistan. When they discovered that customers were circulating illegal copies of software they'd written, the brothers decided to retaliate. Brain was their attempt to scare pirates straight, but, as the creators tell it, the virus was never intended to be malicious. In a 2011 interview with F-Secure, a Finnish anti-virus company, the brothers called the bug a "friendly virus," one that "was not made to destroy any data." Why else would they have stamped the virus code with their names, their phone numbers, and the address of their shop?"The idea was that only if the program were illegally copied would the virus load," Amjad said in a Pakistani TV interview a few years ago. The Alvis also had an ingenious method for keeping track of how far a virus had spread. "[We] had a 'counter' in the program, which could keep track of all copies made and when they were made."Amjad and Basit Farooq AlviThe brothers claim they never knew Brain would grow into a monster beyond their control. But a 1988 Time magazine article reveals a more complicated truth: As concerned as they were with piracy of their own software, that didn't stop them from making and selling bootleg copies of other expensive programs, such as Lotus 1-2-3. In fact, the ethics of their computer vigilantism are a little murky. Computer software isn't copyright protected in Pakistan, Basit has argued in interviews, so therefore it's not piracy for people to trade bootleg discs. Under that rationale, the brothers sold clean bootleg copies to Pakistanis -and virus-infected versions to American students and backpackers. When Americans flew home and attempted to copy the programs, they ended up infecting every floppy disc subsequently inserted into their computers, even discs that had nothing to do with original program.Shortly after the University of Delaware outbreak, Brain began popping up at other universities, and then at newspapers. The New York Times reported that a "rogue computer program" had hit the Providence Journal-Bulletin, though "damage was limited to one reporter losing several months of work contained on a floppy disk."While there was never any legal action, the media response was explosive. Basit and Amjad began receiving calls from all over the world. They were as surprised as anyone that their little experiment had traveled so far. After all, unlike today's computer viruses, which spread at lightning speed, Brain had to transmit itself the old-fashioned way -through human carriers toting around 5.25-inch floppy discs.

The boot sector of a Brain-infected disc. (Image credit: Avinash Meetoo)

But the binary genie was out of the bottle. Today, there are more than a million viruses vying to infect your computer; it's estimated that half of all PCs are or have been infected. Consumers shell out more than $4 billion per year for software to fight these digital dragons.As for the brothers, the virus hasn't been bad for business. Their company, Brain Net, is now the largest internet service provider in Pakistan. While they maintain that they never meant to hurt anyone, they have nevertheless embraced Brain as a device that exposed the global nature of piracy. "The virus could not have spread unless people were copying the software illegally," Amjad said during his Pakistani TV interview.The brothers, who told reporters that they stopped selling contaminated software sometime in 1987, are still based at the same address in Lahore -the one stamped into Brain's code.

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The article above, written by Robert Love, is reprinted with permission from the March-April 2012 issue of mental_floss magazine. Get a subscription to mental_floss and never miss an issue!Be sure to visit mental_floss ' website and blog for more fun stuff!