: Encrypting your files and demanding payment [2].
: The .7z extension is a compressed format. Attackers often password-protect these files to prevent automated antivirus scanners from seeing the "malicious" code inside [2].
: If this was sent by someone you know, their account has likely been compromised . Inform them through a different communication channel [3].
: Perform a full system scan with a reputable antivirus like Microsoft Defender , Malwarebytes , or Bitdefender to ensure no background processes were triggered [4].
: Permanently delete the file and empty your trash/recycle bin [1].