Optus has confirmed at least 2.1 million personal identification numbers have been stolen as the telco announced an external review into the massive cyber attack.
Following investigations, Optus said of the 9.8 million customers whose data was hacked, it believes 7.7 million do not need to replace documents.
The 2.1 million personal ID details include 150,000 passport and 50,000 Medicare numbers.
Optus CEO Kelly Bayer Rosmarin announced details about the number of customers affected by the data breach last month..
“We’re now in a position to say that 7.7 million customers do not need to take further action,” she said.
But she confirmed 2.1 million customers have had an identity document number exposed and they may need to take action.
Optus has been under strong criticism from the federal government over its lack of proper communication to customers about the data breach.
But Bayer Rosmarin has hit back, insisting it was co-operating and Optus was working with a deadline of today to release details, Nine Newspapers reports.
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Optus yesterday announced it has commissioned an independent forensic review into the cyberattack against the telco.
The review will be conducted by international services company Deloitte and will look into the cyberattack itself, Optus’ security systems as well as its controls and processes.
“As part of the review, Deloitte will undertake a forensic assessment of the cyberattack and the circumstances surrounding it,” Optus said.
Bayer Rosmarin said they’re determined to find out what went wrong.
“This review will help ensure we understand how it occurred and how we can prevent it from occurring again,” she said.
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