The decryption keys of the Crysis ransomware were posted on Pastebin, which allows victims to decrypt their hijacked files without paying. Crysis was notorious for spreading through attacks on the Windows Remote Desktop Protocol, using brute force attacks.
Why the keys were released is also unknown, but it may be due to the increasing pressure by law enforcement on ransomware infections and the developers behind them. Kaspersky recently added the decryption keys to their ransom-decryption too.
Computrs Inc continues to help clients recover their data from Ransomware attacks.