Despite the ubiquity of file sharing services like OneDrive and Google Docs, many information workers are still using email to share documents and other files. Radicati reports that the number of business emails sent and received per day will reach 116.4 billion by the end of 2016, and a good number of them will include an attachment. Regardless of the potential version conflicts and security risks, email remains a fast and convenient way for users to review and collaborate on a document.
Because of the huge volume of documents that are shared via email each day, antivirus (AV) technologies around the world are constantly evaluating email attachments for potentially malicious files. Last week the threat detection community ran into a problem when a public domain AV signature provider wrongfully categorized all Microsoft .doc files as a virus. This led to a large number of legitimate Microsoft Word documents to be blocked from transmission when they encountered an AV layer.