Hackers exploit vulnerable Office feature

Posted on Tuesday November 07, 2017

As the world's most popular productivity suite, Microsoft Office tends to receive much attention from cybercriminals. Generally, hackers embed malware in authentic Office files to trick users into unleashing it onto their machines. However, the most recent exploit proves to be much more dangerous than any Office hack we've seen.

What's the new Office threat? The Office exploit takes advantage of Microsoft's Dynamic Data Exchange (DDE), a protocol that sends messages and data between applications. For example, DDE can be used to automatically update a table in a Word document with data collected in an Excel spreadsheet.

The problem with this is hackers can create DDE-enabled documents that link to malicious sources rather than to other Office apps. Theoretically, this allows hackers to launch scripts that download Trojan viruses from the internet and execute it before the user is even aware of the attack.

And unlike most malware-embedded Office files, which are usually blocked by security protocols from Microsoft, DDE exploits are instant. Once a compromised Word file is opened, it automatically executes the hack.

Outlook at risk What's even more alarming are the DDE vulnerabilities in Outlook. Recent reports found that hackers can embed malicious code in the body of an email or calendar invite, allowing them to perform phishing scams without a file attachment.

Fortunately, Outlook DDE attacks are not as automated as Word or Excel DDE attacks. Two dialog boxes will usually appear when you open the email asking if you want to update a document with data from linked files and start a specific application. Simply clicking ‘No' on either of these boxes will stop the attack from executing.

Defending against DDE attacks Beyond saying no, you can protect yourself by following these security best practices:

• Evaluate the authenticity of unsolicited emails before interacting with them and don't open attachments from unfamiliar contacts.
• View emails in plain text format to completely stop DDE attacks embedded directly in emails from running. Note that this will also disable all original formatting, colors, images, and buttons.
• Use a strong email security system that prevents phishing emails, spam, and other unwanted messages from reaching your inbox.
• Get in the habit of checking for Microsoft updates, as they're usually quick to release patches after vulnerabilities have been discovered.

Last but not least, consider working with our team. We're Microsoft Office experts who can keep you safe from the latest threats. Call us today to get started!