GandCrab2 Ransomware is a virus, that uses AES (CBC-mode) algorithm to encrypt user files. During the process ransomware adds .CRAB extension to encrypted files. Following successful encryption, GandCrab2 creates CRAB-DECRYPT.txt file. Unfortunately, due to using TOR payment pages, NameCoin servers and cryptocurrency, there is no way to track the hackers, unless they make a mistake. Decryption key of previous version of GandCrab became public due to data leakage from their servers. GandCrab2 Ransomware asks 0.5 - 0.8 Dash (cryptocurrency) , which is less then before, however it still can estimate from several hundreds to more than thousand dollars.
Arrow Ransomware is new file encryption virus from Dharma/Crysis Ransomware family. Malware uses AES encryption. Unlike previous versions, it appends .arrow extension to all encrypted files. Arrow Ransomware encodes almost all types of files that can be important to users, including documents, images, videos, databases, archives. Arrow Ransomware demands from $1000 to $2000 in BitCoins for the decryption key, that they actually rarely send out. Currently, decryption is not possible, however, you can decrypt your files from backups or trying file recovery software. There is also a slight possibility, that you will decrypt your files using tips and tricks described in this article.
Sometimes malware process or service blocks all your attempts to remove virus, trojan, worm by blocking access to Task Manager, Registry Editor, Services and does not allow you to uninstall itself from Control Panel, to remove files and folders, to stop malicious processes.