Hackers infect WordPress 3.2.1 blogs to distribute TDSS rootkit

Compromised WordPress 3.2.1 blogs infect visitors with TDSS rootkit through Java exploits

Hackers are compromising WordPress 3.2.1 blogs in order to infect their visitors with the notorious TDSS rootkit, according to researchers from Web security firm Websense.

It's not clear how the websites are being compromised, but there are publicly known exploits for vulnerabilities that affect WordPress 3.2.1, which is an older version of the popular blog publishing platform.

Once they gain unauthorized access to a blog, the attackers inject malicious JavaScript code into its pages in order to load a Java exploit from a third-party server.

"From our analysis the number of infections is growing steadily (100+)," said Websense principal security researcher Stephan Chenette in a blog post on Monday. The company's research into this mass code injection campaign indicates that whoever is behind it is experienced.

The Java vulnerability exploited in the attack is known as CVE-2011-3544 and allows the remote execution of arbitrary code. In this case, the attackers are leveraging it to install a version of the TDSS rootkit on the computers of people visiting the website.

"The TDSS rootkit is one of the stealthiest rootkits in the wild," Chenette said. "Its goal is to acquire total control of infected PCs and use them as zombies for its botnet."

The CVE-2011-3544 vulnerability started being targeted by most exploit toolkits in December 2001. These attack frameworks usually contain exploits for vulnerabilities in several software products like Adobe Reader, Flash Player and Java.

The Websense researchers are not sure if this mass code injection campaign uses an updated toolkit or an entirely new one, but experts from security firm M86 Security have tied recent WordPress 3.2.1 compromises to the Phoenix Exploit Kit.

According to M86 security researcher Daniel Chechik, the people behind these attacks are luring victims to the infected websites by sending them spam emails that contain malicious links. The fact that these links lead to legitimate blogs helps attackers bypass URL reputation filters, Chechik said in a blog post on Monday.

It's not clear if the attacks analyzed by M86 Security and Websense are perpetrated by the same gang, but since they both target WordPress 3.2.1 blogs, webmasters are urged to upgrade to the latest version of WordPress, which at this time is 3.3.1.

In order to protect themselves from exploits, Web users should keep the software installed on their computers up to date, especially their OS, browser and browser plug-ins.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Lucian Constantin

Lucian Constantin

IDG News Service
Show Comments

Essentials

Cygnett 2500 ChargeUp Pocket Lightning Portable Power Bank

Learn more >

Mobile

Exec

Budget

TerraCycle Zero Waste Box Pens and Markers Small

Learn more >

Back To Business Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Cathy Giles

Brother MFC-L8900CDW

The Brother MFC-L8900CDW is an absolute stand out. I struggle to fault it.

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Featured Content

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?