Huge spam botnet Grum is taken out by security researchers

http://www.bbc.co.uk/news/technology-18898971

A botnet which experts believe sent out 18% of the world's spam email has been shut down, a security firm said.

Grum's control servers were mainly based in Panama, Russia and Ukraine.

Security company FireEye and spam-tracking service SpamHaus worked with local internet service providers (ISPs) to shut down the illegal network.

A botnet is a network of computers that has been hijacked by cybercriminals, usually by using malware.