A U.K.-based security firm is touting a new service that scours corporate networks for zombies -- PCs that have been hijacked without the owner's knowledge and turned into spam-spewing engines.

A U.K.-based security firm is touting a new service that scours corporate networks for zombies -- PCs that have been hijacked without the owner's knowledge and turned into spam-spewing engines.

Sophos on Wednesday launched the alert service, dubbed ZombieAlert, that warns business, educational, and government administrators when some of the machines on their networks turn into the walking dead. So-called "zombies" account for more than half the world's spam, said Sophos.

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