The security firm Emsisoft has warned anyone hit by the Ryuk ransomware that the decryption tool supplied by the malicious attackers behind Ryuk may no longer be able to decrypt files that have been encrypted.

The Australian Cyber Security Centre has reiterated its advice to Australians regarding ransomware infections, saying that it strongly advised people not to pay any ransom.

Australia data firm Fast Data Recovery reportedly offered to decrypt files that had been encrypted by the Dharma ransomware for a fee of $9650, a security professional claims.