Waledac appeared in a new version in the last days of 2010, sending out big amounts of New Year related spam messages. It then stopped spamming in the evening of January 4th.

On Tuesday morning a new variant
of Waledac was distributed to members of the botnet. Yesterday it
started spamming again, but now it's back to sending pharmaceutical spam
promoting "the magic blue pill" which we have seen previous versions of
Waledac do in the past. As in previous spam campaigns, the spammers are
using redirections via compromised legitimate sites.

…(read more)

Full story: Security Labs

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