In June, GFI threat researchers observed two fresh spam campaigns linking to Blackhole exploits which posed as confirmation emails from Twitter and Amazon.


Delta Airlines similarly had their brand misappropriated in a spam campaign meant to infect users with Sirefef and rogue antivirus software.

“Cybercriminals are ever focused on infecting as many victims’ machines or stealing as much personal information with as little effort as possible. By disguising the source of their spam as messages from companies or organisations with widespread appeal, they can increase the number of potential victims likely to fall for their scams,” said Christopher Boyd, senior threat researcher at GFI Software.

“Any notices or ‘confirmation emails’ that arrive unexpectedly, no matter how legitimate it may appear, should be thoroughly inspected before the user takes any other action. If something seems out of place, users should trust their instincts and use common sense before clicking anything that could make the situation worse,” Boyd added.

Throughout the month of June, phony emails claiming to be Amazon order confirmations were sent to unsuspecting victims in the hopes of infecting them with malware. Users who clicked any of the links contained in the email were directed to a web page that contained Blackhole exploit code.

The exploit scanned the user’s system for Adobe Reader and Adobe Flash before loading a Java applet that redirected the victim to web pages that hosted specially-crafted PDF exploit files depending on the version of Adobe Reader found on the system.

Another fake email posing as a Twitter account confirmation linked victims to a Russian website which housed a Blackhole exploit kit. The site deployed exploits that targeted Adobe Reader and Adobe Flash vulnerabilities which were as old as six years. It’s important to note that both of these attack campaigns could have been avoided had victims kept their software fully patched and up to date.