I have some SCR viruses being sent in a ZIP file that are bypassing the Trend Scanner on Exchange 2010 SP1 CU7.
There are a few reasons I can think this would be occurring
The email message has strange characters, causing the RFC2822 engine in Trend to break, therefore missing the attachment
There is a threading issue in the Trend Code that skips scanning some email messages under load
There is an issue in the MSFT Transport Agent code that means some messages skip the Trend Hub Transport agent
Trend Scanmail noticed that we are above our license count and will only scan X messages of Y total, creating this intentional vulnerability
Can anyone validate, add to, prioritize, or refute what may be going on?
I will share the virus file if so desired/acceptable by the community.