From gbhackers.com

A ransomware gang threatened to reveal the personal information of millions of Medibank customers after the private health insurance firm declared it will not pay a ransom demand.
Medibank is a leading private health insurer, providing health insurance through our Medibank and ahm brands as well as a range of health services across Australia.
In this case, Medibank declared that no ransom payment will be made to the criminal responsible for this data theft.