A Shadow Kill Hackers attack that compromised the city s network and shut down key services was the second ransom-related attack on the city in months. The city of Johannesburg, South Africa, is refusing to pay a ransom of four Bitcoins to a hacker group. The group apparently sent the city a ransom note warning them that hackers had control of everything in your city The city, home to around 5 million, acknowledged that the attack was serious, but still refused to give in to the hackers ransom demands.
Source: https://threatpost.com/johannesburg-refuses-ransom-pay/149676/