https://www.bleepingcomputer.com/news/security/watch-out-for-emotet-malwares-new-windows-update-attachment/

The Emotet botnet has begun to use a new malicious attachment that pretends to be a message from Windows Update telling you to upgrade Microsoft Word.

Emotet is a malware infection that spreads through spam emails containing malicious Word or Excel documents. These documents utilize macros to download and install the Emotet Trojan on a victim's computer, which uses the computer to send spam email and ultimately leads to a ransomware attack on a victim's network.