In 1996 , the first known Excel macro virus, Laroux, was discovered in Africa and Alaska.
Written in Visual Basic for Applications (VBA), Laroux was able to operate under Excel 5.x and 7.x under Windows 3.x, Windows 95 and Windows NT. It was the first macro virus that infected Excel spreadsheets instead of Word documents. It does no harm except to replicate itself.
Learn more about computer viruses at http://www.secretguide.net/read/index.php?filename=viruses