How to remove Arena Ransomware and decrypt .arena files
Arena Ransomware is successor of Dharma Ransomware from CrySis crypto-virus family. This malware uses asymmetric cryptography to encrypt users files, such as documents, photos, music, videos, games etc. This version appends .arena extension to affected files. After finishing encryption process various versions of Arena Ransomware can create different text or html files with instructions: FILES ENCRYPTED.txt, info.hta, Your personal data are encrypted!.txt, _HELP_INSTRUCTION.TXT. Ransomware can demand payment from 0.3 to 1 BitCoins (which is equivalent to $2000 - $6000) for decryption services, but usually malefactors don't send any keys.