Zombies blend in with the crowd

Hackers are trying harder to make their networks of hijacked computers go unnoticed. Cybercrooks are moving to new Web-based techniques to control the machines they have commandeered, popularly referred to as "zombies." Before, they used to send orders via Internet chat services, but with that method, they ran the risk of inadvertently revealing the location of the zombies and themselves.

The change in tactics makes it harder to identify zombies on a network, and it becomes tougher for security professionals to use the hackers' own tools to spy on them. In addition, the switch to Web-based control increases the threat of zombies to enterprises and other organizations, as that method can't be blocked as easily as the previous technique."

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