![]() ![]() Microsoft OneNote attachments that use the '.one' file extension did not distribute malware through macros or vulnerabilities, but threat actors create the intricate templates that appear to be a protected document with a message to a 'double-click' button to view the file. However, after both 7-ZIP and Windows fixed these bugs, threat actors began finding another file format to use in attacks, which led to Microsoft OneNote attachments from mid-December 2022. But, after Microsoft disabled macros by default in Word and Excel Office documents in July 2022, threat actors began turning to ISO files and password-protected ZIP archives, as the Windows and 7-Zip bugs allow these file formats to bypass Mark-of-the-Web (MoTW) security warnings. ![]() Initially, threat actors have been abusing macros in Microsoft Word and Excel documents to spread malware on Windows devices. As per the sources, a harmless Microsoft OneNote file has become a popular file format for malware-distributing phishing attacks for hackers to spread malware and breach corporate networks. ![]()
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