Attackers are always trying to find new ways to deliver malware to victims. They recently started sending Microsoft OneNote files in massive phishing campaigns[1]. OneNote files (ending the extension ".one") are handled automatically by computers that have the Microsoft Office suite installed. Yesterday, my honeypot caught a first sample. This is a good opportunity to have a look at these files. The file, called "delivery-note.one", was delivered as an attachment to a classic phishing email: