All Medibank customers – including those with ahm and international – have had their personal data exposed to hackers, the insurance giant has revealed.

Medibank revealed the update this morning as hackers continue to demand ransom for the data stolen last Tuesday.

“Our investigation has now established that the criminal had access to all ahm customers’ personal data and significant amounts of health claims data; all international student customers’ personal data and significant amounts of health claims data; all Medibank customers’ personal data and significant amounts of health claims data,” Medibank said in a statement.

People walk past a Medibank outlet in Sydney.
Medibank is the latest high profile Australian business to be hit by hackers. (AFR / Louise Kennerley)

“As a result, we expect that the number of affected customers could grow substantially.”

Medibank said its IT systems had not been encrypted by ransomware yet, and customers could continue to access health services.

Support for affected customers include individual “hardship packages” for customers left in a “uniquely vulnerable” decision, free identity monitoring for customers who have had their identity compromised, and free re-issues of compromised documents.

Minister for Cyber Security Clare O’Neil says the damage could be “irreparable”. (Alex Ellinghausen)

“Australians who are struggling with mental health conditions, drug and alcohol addiction, with diseases that carry some shame or embarrassment, they are entitled to keep that information private and confidential,” she said.

“For a cybercriminal to hang this over the heads of Australians is a dog act. It is scum of the earth, lowest of the low territory.”

The AFP is continuing to investigate the incident.

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