Spike in Spam Emails Containing Malicious Office Macros
The documents containing the shipping notices contained a malicious macro. In order to open the attached file, users were required to enable macros on their devices. Doing so would trigger a ransomware download. Email recipients who have their office settings configured to automatically allow macros to run are at particularly at risk, as simply opening the email attachment would result in Locky being downloaded onto their devices.
Proofpoint also recorded this spike in malicious spam emails, although the company put the total number of emails in the campaign at over 100 million, making this one of the largest spam email campaigns seen in recent years, and certainly one of the biggest campaigns of 2016.
The Amazon spam email campaign is being distributed using spam botnets on virtual machines and consumer devices. This campaign was notable because the attackers were able to manipulate the email headers. This made the messages appear legitimate to email recipients. Any email recipients who regularly use Amazon.com for purchases could easily be fooled into opening the file attachment.
The emails used the subject line: “Your Amazon.com order has dispatched” along with a code number, closely mimicking the emails sent up Amazon. The body of the email did not contain any text. If users want to find out which order the email refers to, they would need to open the file attachment. The emails also appear to have been sent from the Amazon.com domain, making it much harder for email recipients to determine that the messages are malicious spam.
Surge in Spam Email Highlights the Importance of Using Spam Filtering Solutions
SpamTitan captures 99.97% of spam email and prevents malicious spam emails from being delivered to inboxes. Since malicious actors are getting much better at masking their messages and making them appear legitimate, it is essential to limit the volume that are delivered to end users rather than rely on individuals to be able to identify emails as spam.