Brain, the first piece of malware in computing history, was crafted by two Pakistani brothers in 1986. Mikko Hypponen, chief research officer at F-Secure, tracked the brothers down last year [2], and while they claimed that the virus was created with innocent intentions, the larger malware market hasn’t been so mild-mannered.
TrendMicro [3] followed the evolution of malware from viruses to worms all the way to the current hacktivist era.
Here are a few highlights from their infographic:
For more information on malware, check out the Trend Micro infographic [3].

Links:
[1] http://www.biztechmagazine.com/author/ricky-ribeiro
[2] http://www.youtube.com/watch?v=lnedOWfPKT0
[3] http://blog.trendmicro.com/threat-morphosis/