![]() Therefore, the SIGMA rule should create very little to no false positives, although further testing in your environment is necessary. Title: Microsoft OneNote Spawning Suspiciousĭescription: Detects an unusual child process creation from Microsoft OneNote.įrom our testing, legitimate use cases of OneNote spawn only processes of other Office applications, web browsers, PDF editors and ONENOTEM.exe. ![]() ![]() We created the following SIGMA rule, which should alert on suspicious code execution attempts. We recommend creating a high severity alert for any suspicious OneNote child process creation. A campaign seen in-the-wild abusing an embedded. I added an old yahoo email to test and that worked ok. Going far beyond email and calendar, Microsoft 365 has document storage and. When I tried, the gmail address isnt listed and so cant be removed. It is very likely that attackers will also experiment with other, more unusual file types.įigure 3. Microsoft 365 is a powerful document management and collaboration platform. The most recent malicious campaigns consisted of embedding. An example of a malicious document, with a social engineering aspect. Common e-mail providers, like Gmail and Outlook, don’t block file attachments associated with OneDrive and OneDrive notebooks with embedded executables share the same file extension as other OneDrive notebooks.įigure 2. 'Bookmarks' in OneNote are simply HTML text links, so they can be kept in neat lists. This also allows for much more flexibility since your bookmarks are not tied to any specific browser. Prompt when executing files from OneNote.įiles itself are distributed mostly via e-mail. OneNote might sound like an odd place for bookmarks, but it actually works very well, allowing co-mingling of bookmarks and related topics - in one place. The files itself are executed with a double-click, after confirming a security prompt.įigure 1. OneNote allows attackers to embed executable files inside notebooks. With the discontinuation of macros, OneNote is the latest app to be abused by threat actors. Without Protected View, files bearing the MotW (files downloaded from the Internet, or extracted from some archives), don’t get any extra security features. Additionally, and unlike other Office applications, OneNote does not feature Protected View. ![]() This means it’s very prevalent on business computers, registered to open notebooks and ready to be abused. OneNote is a digital note taking application available with a Microsoft Office 365 paid subscription or free with a Microsoft account. ![]() OneNote, a popular note taking app, is a part of the Office 365 suite. ![]()
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