A ransomware group that on Tuesday threatened to post data stolen from medical insurer Medibank Group on the dark web has kept its word and released a small sample of what it claims is the data it appropriated.

The operator of this group, that hosts a copy of the site formerly used by the REvil gang, said the data was stored “in not very understandable format (tables dumps) we’ll take some time to sort it out and we posting (sic) a small part of the data, in ‘human readable format (sample in json file )’ also we post all raw data.

“We’ll continue posting data partially, need some time to do it pretty.” The attacker also said the negotiation process was detailed within the leaked data.

“We’ll continue posting data partially, including confluence, source codes, list of stuff and some files obtained from medi filesystem from different hosts.”

A single active link was provided to a small amount of data. Threat researcher Brett Callow said: “In order to complicate any takedown efforts, REvil/Blogxx has mirrored the data, making it available via [a] second site.”

The name of the ransomware used is not definite but some refer to it as BlogXX. But it can attack only systems running Microsoft’s Windows operating system.

Callow, who works for the New Zealand-headquartered security firm Emsisoft, said in a tweet that the data had been posted, adding: “The data seemingly includes Good and Naughty lists (useful intel for Santa?).”

Medibank on Monday made a big deal about announcing that it would not pay a ransom to the attacker(s) who had hit its systems. The company announced to the ASX that the number of current and former customers affected by the attack could be as many as 9.7 million.

At about 11am AEDT on Tuesday, Medibank said it was aware of media reports of the threat made by the ransomware group. It claimed the group could also try to contact customers directly.

Chief executive David Koczkar said: “Customers should remain vigilant. We knew the publication of data online by the criminal could be a possibility, but the criminal’s threat is still a distressing development for our customers.

“We unreservedly apologise to our customers. We take seriously our responsibility to safeguard our customers and support them. The weaponisation of their private information is malicious, and it is an attack on the most vulnerable members of our community.”

REvil, also known as Sodinokibi, was a ransomware-as-a-service operation that was claimed to have been taken offline by intelligence agencies and law enforcement from the US and a number of its allies in October 2021.

A statement from Medibank said it had become aware of the released data.

“This data includes personal data such as names, addresses, dates of birth, phone numbers, email addresses, Medicare numbers for ahm customers (not expiry dates), in some cases passport numbers for our international students (not expiry dates), and some health claims data,” it said.

“The files appear to be a sample of the data that we earlier determined was accessed by the criminal. We expect the criminal to continue to release files on the dark web.”


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