VSTO office files are the new macro nightmare?
Visual Studio Tools for Office (VSTO) has the capability to export an Add-In which is embedded inside an Office document file (such as a Word DOCX). If this document is delivered in the right way (to avoid some inbuilt mitigations) it provides rich capabilities for attackers to phish users and gain code execution on a remote machine through the installation of a word Add-In.
Office itself even provides an automatic update capability, which can be used by attackers to update payloads remotely. Make phishing great again. VSTO office files are the new macro nightmare?