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Spam might have slipped, but malware authors were as busy as ever during the third quarter of the year, according to McAfee.

In the "McAfee Threats Report: Third Quarter 2010″ (PDF), the company notes that even though spam declined, an average of 60,000 new malware threats were identified each day, which is nearly four times the 16,000 detected per day in 2007. In addition, McAfee has already identified more than 14 million unique pieces of malware, "well over a million more" than at the same time last year, according to the report.

During the quarter, McAfee notes, the security community discovered the Stuxnet worm, which many consider to be one of the most sophisticated pieces of malware in the world. But grabbing nearly as much media attention during the quarter was the infamous Zeus Trojan, which moved from just targeting PCs to going after mobile devices.

“We saw several email campaigns that tried to deliver either Zeus itself or the Bredolab Trojan, which will download several kinds of malware,” the report notes, citing spam campaigns exploiting FedEx, Western Union and other brands.

The attackers sometimes used graphics in their e-mails as opposed to text in an attempt to dodge spam filters, McAfee added. Sixty percent of the Zeus spam spoofing messages from eFax came from the United States, the report found.

In September, law enforcement officers around the world arrested dozens of people involved in a cyber-crime ring pushing the Zeus Trojan. Meanwhile, the Cutwail botnet was particularly busy, accounting for more than 50 percent of botnet traffic in every country. Cutwail bots were involved in distributed denial-of-service attacks against more than 300 Websites, including sites for the FBI and CIA as well as Twitter and PayPal.

Read the rest of this story at eWeek: McAfee: Spam Falls, but Malware Still King.