remove avcrypt

AVCrypt is new cryptovirus that uses AES/RSA encryption algorithms to prevent access to user’s files. While encoding, virus prepends “+” to each affected file. Par exemple, myfamily.jpg turns into +myfamily.jpg. Après ça, il crée un fichier TXT (“+HOW_TO_UNLOCK.txt”) which contains merely “lol n” text instead of ransom demands.