As with most ransomware attacks, the best way you can protect your computer from this threat is by installing a credible anti-virus on your device and making sure it stays up to date at all times. If Ryuk manages to infect your system then we recommend that you immediately disconnect your device from the web and perform a full system scan using an updated version of your anti-virus/anti-malware tool. Furthermore, if you find that Ryuk has managed to encrypt your files then we urge you not to pay anything and instead use decryption tool exclusively available via our website.