Spammers are exploiting YouTube's "Invite your Friends" facility to send spam containing a Storm Trojan from the video sharing site.
Criminals behind the Storm worm have created a botnet containing millions of PCs, which have a combined computing power greater than the most powerful supercomputer in existence.
After a hiatus, the gang behind the Storm worm is attempting to exploit people's curiosity about a fictional love interest to tempt users into downloading the malware, according to security training organisation the Sans Institute.
The owners of the Storm botnet, whose identities are as yet unknown, could be preparing to sell off the "services" of segments of the network, according to Joe Stewart, a researcher from managed security services company SecureWorks.
In just eight months the Storm worm has infected more than 20 million computers and built a zombie army -- or botnet -- capable of launching DDoS attacks that could be used against any organisation or even damage critical infrastructure, according to security experts.
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