Brain may not have been the most sophisticated virus, but in 1986 it
was the first to really target PCs, via Microsoft's then-dominant DOS
operating system.
The virus ate up a huge chunk of memory and caused computers to display a message warning that they had been infected.
It even told them whom they should
call to get disinfected: a couple of brothers in Pakistan. Those
brothers, the original developers, claim they weren't trying to cause so
much trouble; they created the virus as a means of copy protection for
their medical software...but then someone else came along and copied
that bit of code and the brothers got more than they had bargained for,
with pleas for disinfection coming from around the world.
The moral of the story? Be careful what you program.
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