It appears that this Halloween the malware writers preferred choice of infection vector is by using SEO (Search Engine Optimization) techniques to poison popular search terms.
We at SophosLabs have seen relatively few email campaigns that exploit Halloween this year, but there have been plenty of campaigns pushing malware loaded URL's into festive search terms.
We have various Fake AV families featuring highly:
Which leads to the familiar:
There are also families that pose as fake media codecs exploiting Halloween to push their wares:
As users wise up to the dangers of email attachments we are seeing SEO poisoning becoming a more and more popular attack vector.