Do you allow Macros in Word and Excel?
If you get email containing an unexpected docx or xlsx attachment, the attachment might contain a malicious macro. Your well-honed Internet Skepticism should prevent you from even clicking on the attachment! But if your finger slips and the document opens, don't let any macro in that document run on your computer! Your Word and Excel are configured to ask you before running a macro, right? If you aren't sure, ask your support person to help you check, before it is too late.
For more about the return of this hacker/spammer strategy (yes, we've seen it before), see: Bitdefender warns against junk MS Office attachments written on Jan 26, 2015 at HOTforSecurity.com.