¿Cómo eliminar PAY_IN_MAXIM_24_HOURS ransomware y los archivos decrypt

PAY_IN_MAXIM_24_HOURS is a typical crypto-virus claiming to delete encrypted files if payment is not made within 24 horas. It is not yet known what encryption algorithm is used. All we know is, to decrypt our files, we need a unique key which cybercriminals supposedly send after payment.