Ransom:Win32/Stopcrypt.Sac!Mtb is a type of ransomware that encrypts files on a computer and demands payment from the user in exchange for the decryption key. This particular ransomware variant infects computers through various means, such as malicious email attachments, fake software downloads, or exploiting vulnerabilities in the system. Once infected, Ransom:Win32/Stopcrypt.Sac!Mtb will encrypt files on the computer and display a ransom note instructing the user on how to pay the ransom in order to retrieve their files. It is important to regularly backup your files and keep your antivirus software up to date to help prevent infection by ransomware.