Optus data cyberhack breach hack |Optus hit by cyberattack with millions of customers potentially having personal information compromised

The search continues for the mystery actor behind a massive cyberhack on telecommunications company Optus that potentially compromised the personal information of millions of Australians.

Reports suggest up to 2.8 million Australians have been implicated in the cybersecurity breach, which could have leaked information such as passport and licence numbers, email and home addresses, dates of birth and telephone numbers.

Payment details and Optus account passwords were not compromised.

Reports suggest up to 2.8 million Australians have been implicated in the cybersecurity breach. (Supplied)

Optus has 9.7 million customers overall.

The breach implicates both past and present customers of Optus.

The Australian Competition and Consumer Commission’s (ACCC) Scamwatch has advised customers to change their passwords now to avoid suffering identity theft.

“If you are an Optus customer your name, date of birth, phone number, email addresses may have been released. For some customers identity document numbers such as driver’s licence or passport numbers could be in the hands of criminals,” Scmawatch said in a statement.

“It is important to be aware that you be may be at risk of identity theft and take urgent action to prevent harm.”

In a statement Optus said it “immediately shut down” the attack once it was aware of the breach and the Australian Federal Police have been notified.

”We are devastated to discover that we have been subject to a cyberattack that has resulted in the disclosure of our customers’ personal information to someone who shouldn’t see it,” said Kelly Bayer Rosmarin, Optus CEO.

Optus CEO Kelly Bayer Rosmarin has apologised to customers. (Dominic Lorrimer)

“As soon as we knew, we took action to block the attack and began an immediate investigation.

“While not everyone maybe affected and our investigation is not yet complete, we want all of our customers to be aware of what has happened as soon as possible so that they can increase their vigilance.

“We are very sorry and understand customers will be concerned. Please be assured that we are working hard, and engaging with all the relevant authorities and organisations, to help safeguard our customers as much as possible.”

Optus said it blocked the attack as soon as it became aware of the breach. (AAP)

Rosmarin said the telco is not yet aware of any customers having suffered harm as a result of the breach.

“Optus has also notified key financial institutions about this matter,” she said.

“While we are not aware of customers having suffered any harm, we encourage customers to have heightened awareness across their accounts, including looking out for unusual or fraudulent activity and any notifications which seem odd or suspicious.”

Current services such as mobile and home internet are not affected, and the messages and voice calls of customers have not been compromised.

Optus says services remain safe to use and are operating as normal.

Image of text message scam impersonating someone's dad.

Text message scam attempts to fool recipient with contact name

For customers who have specific concerns, they can contact Optus via the My Optus App (which remains the safest way to interact with Optus) or by calling 133 937. Optus will not be sending links in any emails or SMS messages.

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