Arena Ransomware belongs to CrySis family, previous wide-spread ransomware of this type was Dharma Ransomware, that we described on this blog. Arena Ransomware was detected by security researches first time in August 2017. Since then, it had numerous updates. Different versions of Arena Ransomware demand different ransom amounts. It varies from 0,20 to 0,73 BitCoins, which is near $5000. Security experts do not recommend to pay developers of ransomware, as this encourages them to create new variations and does not guarantee decryption of your files. Actually, most times malefactors don’t send decryption keys. Latest versions of Arena Ransomware are not decryptable, however there is a chance to restore files affected by older versions.