Researchers at HCL Technology, a contractor for CA, found a hacked server on Amazon’s Web Services’ cloud infrastructure working as a command-and-control server for the Zeus botnet.

The researchers said the intruders probably found a server — a “target of opportunity” — and hacked it to install their malware. The Zeus server has been removed. The Zeus botnet has been responsible for losses of over $100 million, mostly from bank fraud.


Security company Arbor Networks in August found a botnet using Twitter as a command-and-control channel for its bots.

In September, Symantec researchers found the Chinese-language Grups Trojan using the Google Groups newsgroup escape2sun to distribute commands.

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