From Computer World

More than 40% of the world's spam is coming from a single network of computers that computer security experts continue to battle, according to new statistics from Symantec's MessageLabs' division.

The Rustock botnet has shrunk since April, when about 2.5 million computers were infected with its malicious software that sent about 43 billion spam e-mails per day. Much of it is pharmaceutical spam.

Now, about 1.3 million computers are infected with Rustock, and the botnet is making up for its decreased size with increased volume, said Paul Wood, a MessageLabs intelligence analyst with Symantec. Those infected computers -- most of which are in North America and Western Europe -- are collectively sending around 46 billion spam e-mails per day.

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