Three Arrested in Spain for Largest Botnet

Authorities in Spain have arrested three men accused of operating a massive botnet composed of 12.7 million PCs that stole credit card and bank log-in data and infected computers in half of the Fortune 1,000 companies and more than 40 banks, according to published reports. The botnet "Mariposa," which means butterfly in Spanish, first appeared in December 2008 and grew to be one of the largest botnets ever, The Associated Press reported.