You've heard of the botnet — a collection of enslaved, malware-infested computers that act together to pump out spam and DDoS attacks, often unbeknownst to their owners. For the past decade, botnets have mostly been a problem for the PC world. But, according to a new report on mobile malware, it may not be long before we start seeing botnets built out of an increasingly sophisticated type of device: cell phones.

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