Security researchers said they dismantled the world 's No. 3 spam botnet after convincing the companies that hosted its command and control servers to pull the plug on the operation. Grum 's control servers were mainly based in Panama, Russia and Ukraine. Computer security experts blocked the botnet 's command and control servers in the Netherlands and Panama on Tuesday. But later that day, Grum s architects had already set up seven new command and control centers in Russia and Ukraine. FireEye, a ...

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