Malware spam is back after a one-month hiatus! The attack has returned to the forefront of the spam threat landscape in the form of .zip and .html attachments, as discussed in the September 2010 State of Spam & Phishing report. Malware spam more than tripled in volume, and .zip attachment spam saw a four-fold increase month-over-month. As such, we reviewed what this attachment spam contained and discussed how those threats pose a serious risk to users. Overall, spam made up 92.51% of all messages in August, compared with 91.89% in July.