so many .zip spam files.

I've quite satisfied with newsbin's spam filtering system which almost always filter passworded crap.
But recently there's so many zip files which contain some bad exe file.
I am sure that's all spam.
Is there any good way to block them ? Now I use "-zip" expression when I use the search service from newsbin.
But recently there's so many zip files which contain some bad exe file.
I am sure that's all spam.
Is there any good way to block them ? Now I use "-zip" expression when I use the search service from newsbin.