Ransomware is here to stay. This is something becoming clearer by the minute. It is a very lucrative business if we judge it by the successful infection effectiveness rate and, to a lesser extent, due to rescue payment rates by the affected parts.
To the already infamous Cryptolocker, CryptoWall, TorrentLocker, TeslaCrypt and others, we have to add the recent HydraCrypt and UmbreCrypt. All of them with slight variations over the previous ones in an attempt to avoid the scarce barriers that Antivirus institutions are introducing, together with some initiatives more or less imaginative, and somewhat effective, in order to identify the activity of this kind of threat.
Recently, the CNI (Spanish National Intelligence Center), through the CCN-CERT, published a Ransomware guide where they had compiled some ransomware variants together with file decrypting tools that different Antivirus companies provided, after disarticulating several criminal networks or after deep analysis of malware samples.