Word Macro downloaders are not detected

Hi,

Recently I have received several emails having a word document attached. They are obvious harmful files (containing a message about invoice not paid). My concern is that the up-to-date Norton Internet Security do not identify these files as a threat. Seems that other antivirus programs do.

I  have forwarded some of these messages to scan@virustotal.com for scanning and e.g. kaspersky and McAfee commonly identify these as Word macro downloaders.

Is there anything we can do to improve the detection rate?

Thanks

Marko