German programmer Tobias Frömel “hacked back” the perpetrators of the Muhstik ransomware who forced him to pay 0.09 BTC
Source: https://cointelegraph.com/news/german-programmer-hacks-back-after-bitcoin-ransomware-attack
German Programmer ‘Hacks Back’ After Bitcoin Ransomware Attack
October 9, 2019
CoinTelegraph