Russian hi-tech criminal Georgiy Avanesov was found guilty of computer sabotage by an Armenian court.
Mr Avanesov was tried and sentenced in Armenia, as he was arrested at the country's Yerevan airport in 2010.
The authorities closed in on Mr Avanesov after they took and dismantled the network of computers he controlled.
Bredolab began operating in 2009 and Mr Avanesov used a variety of techniques, including automated attacks and phishing messages, to expand it. A network of hijacked machines run in this way is known as a botnet and they have become the staple of many hi-tech criminals.