Menu
Email-based attacks exploit unpatched vulnerability in Microsoft Word

Email-based attacks exploit unpatched vulnerability in Microsoft Word

Attackers have been exploiting a zero-day vulnerability in Microsoft Word since January to infect computers with malware

Attackers have been exploiting an unpatched vulnerability in Microsoft Word for the past few months to compromise computers and infect them with malware.

The first report about the attacks came Friday from antivirus vendor McAfee after the company's researchers analyzed some suspicious Word files spotted a day earlier. It turned out that the files were exploiting a vulnerability that affects "all Microsoft Office versions, including the latest Office 2016 running on Windows 10."

The flaw is related to the Windows Object Linking and Embedding (OLE) feature in Microsoft Office that allows documents to embed references and links to other documents or objects, the McAfee researchers said in a blog post.

When the rogue documents used in this attack are opened, they reach out to an external server and download an HTA (HTML Application) file that contains malicious VBScript code. The HTA file is disguised as an RTF (Rich Text Format) document and is automatically executed.

"The successful exploit closes the bait Word document, and pops up a fake one to show the victim," the McAfee researchers said. "In the background, the malware has already been stealthily installed on the victim’s system."

By searching back through its data, McAfee has tracked down attacks exploiting this vulnerability to late January.

Following McAfee's report, security researchers from FireEye also confirmed that they've been aware of these attacks and exploit for several weeks and have coordinated disclosure with Microsoft.

According to FireEye, the malicious Word documents are sent as email attachments. The company hasn't provided examples of the malicious emails, but because this is a previously undisclosed, zero-day vulnerability, the attacks are likely targeted toward a limited number of victims.

Both McAfee and FireEye noted that the exploit can bypass most memory-based mitigations included in Windows. That's because the vulnerability is a logic bug rather than a programming error.

Microsoft is scheduled to release its monthly security updates on Tuesday, but it's not clear if a patch for this vulnerability will be included. The company did not immediately respond to a request for comment.

In the meantime, users should be wary of documents received from untrusted sources and should enable the Office Protected View mode because it can block this attack.


Follow Us

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.

Featured

Slideshows

Reseller News welcomes industry figures for 2019 Hall of Fame lunch

Reseller News welcomes industry figures for 2019 Hall of Fame lunch

Reseller News welcomed 2018 inductees - Chris Simpson, Kendra Ross and Phill Patton - to the third running of the Reseller News Hall of Fame lunch, held at the French Cafe in Auckland. The inductees discussed the changing landscape of the technology industry in New Zealand, while outlining ways to attract a new breed of players to the ecosystem. Photos by Gino Demeer.

Reseller News welcomes industry figures for 2019 Hall of Fame lunch
Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019

Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019

The channel came together for the inaugural Reseller News Emerging Leaders Forum in New Zealand, created to provide a program that identifies, educates and showcases the upcoming talent of the ICT industry. Hosted as a half day event, attendees heard from industry champions as keynoters and panelists talked about future opportunities and leadership paths and joined mentoring sessions with members of the ICT industry Hall of Fame. The forum concluded with 30 Under 30 Tech Awards across areas of Sales, Entrepreneur, Marketing, Management, Technical and Human Resources. Photos by Gino Demeer.

Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019
Show Comments