VERY IMPORTANT

Talos has observed a small email campaign leveraging the use of Microsoft Publisher files. These .pub files are normally used for the publishing of documents such as newsletters, allowing users to create such documents using familiar office functions such as mail merging. Unlike other applications within the Microsoft Office suite, Microsoft Publisher does not support a 'Protected View' mode. This is a read only mode which can help end users remain protected from malicious document files. Microsoft Publisher is included and installed by default in Office 365.