What is .Peet file Peet or .Peet file extension is the name of the new malware that belongs to STOP (djvu) ransomware family. The malware was discovered by the security researcher recently. Upon infecting a computer, it encrypts files on the computer, renames the affected files, adding .Peet extension at the end of their filenames, … Continue reading .Peet file extension. Remove Peet virus. Restore, Decrypt .peet files.