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Home > Cybersecurity > Outlook for Mac allows distributing malware to Windows users

Outlook for Mac allows distributing malware to Windows users

The bug in Outlook’s Mac version allows threat actors to bypass the e-mail security systems with simple hyperlinks.


Rusen Gobel Rusen Gobel
January 28, 2022
2 min read
Outlook for Mac allows distributing malware to Windows users

E-mails are still being an attack surface in the year 2022. Basic scamming campaigns are mostly decreased but threat actors still looking for vulnerabilities to hit the targets with e-mails. Of course, one of the most used e-mail clients in the world, Outlook, is mostly inspected for flaws by threat actors. Here is the newest one.

Attacking Windows users from Macs

Because of a bug on the Outlook Mac client, the e-mail hyperlinks are translated incorrectly. The incorrect translation enables delivering malicious links to the targets without getting caught by the e-mail security systems. Here is how it happens:

  • An e-mail sent from Outlook Mac has a link as http://trustedexamplesite.com
  • The link is hyperlinked as file:///maliciousexamplesite.com
  • The e-mail translates the hyperlink to file:///trustedexamplesite.com
  • The Outlook Windows user clicks the link; it automatically converts to HTTP version http://maliciousexamplesite.com

As these steps are complete, threat actors can do a variety of things such as directing the users to fake websites. This vulnerability is tracked as CVE-2020-0696 and is now patched by Microsoft via an automatic update. But users who are not using up-to-date Outlook clients might be at risk.

Trustwave, the security company that has found the vulnerability, has stated that they noticed attacks that were using this method. After the company informed Microsoft about the flaw, it was patched in February 2020. However, the patch did not cover all of the possible versions of the attack. The threat actors were still able to reproduce the attacks by using a hyperlink like http:/://maliciousexamplesite.com. The second method is also patched in the summer of 2021.

This shows the importance of keeping Office programs, especially Outlook, updated. And we still must be cautious about the links in e-mails.

See more Cybersecurity News


Tags: MicrosoftOffice 365
Rusen Gobel

Rusen Gobel

Rusen Gobel is a news editor at Cloud7 News. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as Shiftdelete, Teknokolis, 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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