These emails are a hybrid between virus and spam messages, and are designed to look like legitimate, Non Delivery Report messages.
“Fortunately, our spam traps were receiving these messages early, providing our engineers with advanced warning which allowed us to write manual filters and escalate to our anti-virus partners quickly.”
The Postini engine processes more than 3 billion email messages per day, and it has registered an upsurge in the volume of spam (16% more compared to Q1 2010), and a lesser increase (3%) in virus traffic. Although, it is worth to notice that – compared to the numbers of Q2 2009, virus traffic has increased for a whooping 260%!
Among other relevant threats, Google mentions the false social networking messages, those tied to major news stories, false shipping emails and the “friend in need” phishing messages.