"A user got his revenge on the ransomware gang who encrypted his files by hacking their server and releasing the decryption keys for all victims," writes ZDNet.
ccnafr shared their report:
One of the gang's victims was Tobias Frömel, a German software developer. Frömel was one of the victims who paid the ransom demand so he could regain access to his files. However, after paying the ransom, Frömel also analyzed the ransomware, gained insight into how Muhstik operated, and then retrieved the crooks' database from their server. "I know it was not legal from me," the researcher wrote in a text file he published online on Pastebin earlier Monday, containing 2,858 decryption keys. "I'm not the bad guy here," Frömel added.
Besides releasing the decryption keys, the German developer also published a decrypter that all Muhstik victims can use to unlock their files. The decrypter is available on MEGA [VirusTotal scan], and usage instructions are avaiable on the Bleeping Computer forum.
In the meantime, Frömel has been busy notifying Muhstik victims on Twitter about the decrypter's availability, advising users against paying the ransom.
Read more of this story at Slashdot.