A new phishing attack that tries to convince the target to open a malicious attachment is being sent through email. The email identifies itself as being sent from Microsoft with subject lines “Install Latest Microsoft Windows Update now!” or “Critical Microsoft Windows Update!” and has the “latest critical update” as an attachment. The file that appears to have a .jpg file extension is really a .NET downloader that delivers malware to your machine. More specifically, it installs ransomware called bitcoingenerator.exe. It encrypts the recipient’s files and leaves a text file named “Cyborg_DECRYPT.txt” on their desktop. A message within it asks for $500 in bitcoin to unlock the files. Windows users should note that Microsoft will never send a security patch via email.
https://www.cnet.com/news/windows-users-beware-this-fake-update-could-lock-up-your-pc-or-worse/
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