The hackers have drip-fed sensitive health information about Medibank customers on the dark web in an attempt to pressure the company into paying a $US10 million ($15 million) ransom,which the insurer has refused to pay.
The hackers accessed the health claims data for about 160,000 Medibank customers,300,000 ahm customers and 20,000 international customers.
Medibank chief executive David Koczkar told investors last week that the company’s resolve to not pay a ransom had not changed,and he warned that information being released on the dark web was often incorrect.
“The data that’s actually on the dark web is sometimes not accurate. It’s not complete,” he said.
Medibank has now confirmed that its analysis has shown about 25 per cent of records released on the dark web did not match against that policy for that procedure.
The hackers held off from releasing further data ahead of the shareholder meeting last Wednesday to see if Medibank would relent and pay the ransom. Early Sunday morning,the criminals then released another 1500 customer records containing sensitive health information – the largest release of health data so far in the incident.