While different from other types of file formats like RTFs or Open Office XML documents, where code execution occurs through vulnerability exploitation or macros, its current role in the threat space is to be like an envelope used to deliver malicious files. Within the last several weeks, a number of attackers have shifted to using OneNote attachments in phishing emails. It is this quality that makes it attractive to adversaries. It's a flexible document format for managing content from text to images, and importantly, enables arbitrary file content to be embedded in the form of attachments. It is also available for free outside of Office. Microsoft OneNote is a digital notebook application that is included in the Microsoft Office suite.
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