Yes using the spam filter in LW 4.10 it's actually quite easy. It's called autogenerated spam & that type is mp3 autospam; autogenerated mp3 spam results
It took me just 2 searches to filter out all basic auto-spam such as the ipod advert & the clinton digital voice file. All those files are the same size so easy to recognise. The virii are harder to filter out. That takes many, many more attempts using the spam filter.

More about virii sizes to avoid see WARNING: Viruses on network you should be aware of! (click on link)