Hacking group Scattered Lapsus$ Hunters, which claimed responsibility for the mammoth Qantas cyber breach in July, has vowed to release the personal details of millions of Australians on the dark web unless it is paid a hefty ransom by Friday.

Qantas was thrown into turmoil in late June when the company revealed that 1.3 million addresses and 900,000 phone numbers had been leaked in a massive cyber breach.

Over 5.7 million pieces of unique customer data stored in a database for the airline's Manila call centre was swiped in the attack, including residential and business addresses, emails, data of birth and phone numbers.

The carrier stressed that no credit card details, personal financial information or passport details were accessed and that there had been no evidence any data acquired

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