(Lance Whitney, CNet) Spam may be down but malware marches merrily on. That's the message from the "November Threat Landscape Report" released yesterday by security vendor Fortinet.

Global spam levels ultimately fell 12% in November after Dutch authorities took down a large Bredolab network made up of 140 different servers. The Bredolab botnet was typically used by cybercriminals to send out spam selling fake drugs, according to Fortinet. Spam had actually fallen as much as 26% the week after the network was dismantled but was able to stage a bit of a recovery afterward.

In terms of sheer malware attacks among the top countries hit in November, the U.S. accounted for 35%, up from 32% in October. Japan took 22% of the total attacks, up from 16% the prior month. And Korea took the brunt of 12.5% of the world's total malware attacks, up from less than 9% in October.