From 'What's new at Ziff Davis'
http://ct.eletters.whatsnewnow.com/r...-17779-0-0-0-1

Perhaps the past few relatively attack-free months were just a lull. It feels that way today, coming back from a quick few days off, as I scan our headlines. A chilling new advance seems to be taking place. Eschewing more popular schemes for delivering files, malware writers have seized on a little-known but widely used scheme for downloading media files. It has proved quite popular. Our story details how these new viruses are bypassing virtually every anti-virus product on the market, and what you can do to stop them.
Just as you begin to feel a little more secure ........... Along comes something else thats coming through the filters without being picked up.

Anti-virus vendors have acknowledged the presence of viruses delivered as .rar files in the past few weeks and are scrambling to develop tools to identify and eradicate the malware.
And here you find a knock on effect of the Spam with regard to DNS servers.

The problem as written, is that the users are gradually accepting that .zip files are a no no, but
the novelty of the .rar format is enough to fool some users.
So, no surpises there then