A new malware campaign is under way: emails sent from a fake Microsoft address are pushing people to download a malicious Windows 10 “critical update”. Beware! Spotted by computer security company Trustwave, the subject of the mail says “Install Latest Microsoft Update now!” or “Critical Microsoft Windows Update!” The mail contains one single line that says “Please install the latest critical update from Microsoft attached to this mail” and an attached file. .
Link: Windows 10 fake update is nasty ransomware