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Home > Cybersecurity > The already-patched Office flaw has been tested by hackers again

The already-patched Office flaw has been tested by hackers again

The attackers have tried different methods to inject Formbook malware into the victim’s computer.


Rusen Gobel Rusen Gobel
December 22, 2021
2 min read
The already-patched Office flaw has been tested by hackers again

The researchers of the security company Sophos have published details of the new attacks using Microsoft Office programs. As researchers state, the attackers use the CVE-2021-40444 flaw, which has been patched by Microsoft months ago with a different method.

A complicated attack that uses a patched vulnerability

In the patched CVE-2021-40444 flaw, the attackers put Microsoft Cabinet (.cab) files into Office documents to deliver malware payload. After this high-CVSS flaw was patched, the attackers have been trying other methods to inject malware using Office documents.

The new method discovered uses a specially crafted RAR archive. The attackers send an e-mail to victims containing a RAR file with a Word file (.docx) inside. The RAR file, which was named Profile.rar in the attachments, is malformed. It secretly contains a script written in Windows Scripting Host notation, with the malicious word document following the script text.

Surprisingly, the latest version of WinRAR manages to open the malformed archive while alternative programs and some older versions simply do not.

The exploit triggers as the user uncompresses the Word document and opens it. Microsoft Word immediately contacts a server with a Javascript code, and the code runs the embedded script code in the RAR archive. And that code runs power invokes PowerShell to download a malware executable, a Formbook that collects screenshots and logs keystrokes. But it is possible to use some other executables that are even more dangerous.

Interestingly, hackers only tried this attack method for only 36 hours. The researchers of Sophos think that this may be a dry run before further incidents of exploitation. It’s better not to open Office documents that are unusually put into a RAR file for a while.

To read the full documentation by Sophos, click here.

See more Cybersecurity News

A comprehensive guide to understanding Cybersecurity: What is Cybersecurity?


Tags: Microsoft
Rusen Gobel

Rusen Gobel

Rusen Gobel is the managing editor of Cloud7. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as ShiftDelete, Teknokulis, Hardware Plus, BT Haber. In addition, Rusen publishes consumer product reviews on his YouTube channel. While consumer electronics has been his main focus for years, now Rusen is more interested in WordPress and software development. He had contributed different web application projects in his professional career. Rusen had graduated from Istanbul University, department of Computer Engineering. Rusen has a very high passion for learning and writing for every kind of technology. That's why he has been working as a tech editor for more than ten years on several different technology magazines and online news portals.

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