The spam run began on 17 October and lasted about 36 hours, using infected computers in the Storm Worm network to send out the mails, MessageLabs said in a statement released on Tuesday. The spam sounded strange because the voice in the message was "synthesised using a very low compression rate of 16KHz to keep the overall file size small, at around 50KB, to avoid detection," the company said.
Storm is thought to have landed on as many as 15 million PCs over the past year, but recently its network of infected PCs has been shrinking. University of California, San Diego, researchers recently pegged it at about 160,000 computers, only 20,000 of which are accessible at any one time.
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