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The federal government is preparing to unveil new cybersecurity protections, as Prime Minister Anthony Albanese describes the Optus data breach as a "huge wake-up call".

Cyber Security Minister Clare O'Neil is set to announce the measures after she said changes were needed to how companies protected customer data.

Optus revealed on Thursday it had been the target of a cyber attack that exposed the personal information of up to 9.8 million Australians, including details such as driver's licence and passport numbers.

Prime Minister Anthony Albanese said new protections would mean banks and other institutions would be informed much faster when a breach happened so personal data could not be used.

"This is a huge wake-up call for the corporate sector in terms of protecting the data," he told Brisbane radio 4BC on Monday.

"We know in today's world there are actors - some state actors but also some criminal organisations - who want to get access to people's data."

Optus said it had sent emails or text messages to all customers who had identification documents compromised in the cyber attack.

"We continue to reach out to customers who have had other details, such as their email addresses, illegally accessed," it said.

Payment details and account passwords have not been compromised.

It comes as opposition home affairs spokeswoman Karen Andrews introduced a bill to parliament to crack down on cyber criminals.

The bill includes a new standalone offence for cyber extortion and introduces tougher penalties for those preying on vulnerable Australians online.

Cybercriminals who use ransomware would face 10 years in prison while those targeting the country's critical infrastructure would face a maximum 25 years.

"It's designed to disrupt and deter cybercriminals who engage in ransomware and cyber extortion activities targeting Australians and Australian businesses," Ms Andrews told parliament on Monday.

"It hits the cybercriminals where it hurts the most and that's in their hip pocket. These are all sensible measures that will create a greater deterrence and therefore reduce the incidence of ransomware attacks."

The opposition has accused the government of dropping the ball on cybersecurity.

Spokesman James Paterson criticised Ms O'Neil's response to the news of the attack and said Optus "owed their customers a full explanation and a genuine apology".

"It's appropriate that when there's an investigation going on that they follow the AFP's advice but that should not be used as an excuse not to be completely up front with the public about how this happened and who's responsible for it, when those facts are known," he said.

Ms Andrews also hit out at the government for overhauling federal cyber security strategies.

"Why would you say you're getting rid of something when you don't know what you're going to replace it with?" she said.

"Cyber criminals are coming up with new ways every day to use malware and, specifically, ransomware to do us real and long-lasting harm."

© AAP 2022

The inquest into the disappearance and suspected death of fraudster Melissa Caddick is due to resume with evidence from an investigator who helped uncover her million-dollar fraud.

Isabella Allen from the Australian Securities and Investments Commission led the formal investigation from September 8, 2020 into Ms Caddick's Ponzi scheme operated under her fake company Maliver.

The conwoman purported to be investing her victims' wealth by appearing to set up CommSec trading accounts and forging documents to claim she was generating profits through capital growth and shares.

She preyed on mostly friends and family and stole up to $30 million between 2013 and 2020, counsel assisting Jason Downing SC has told the inquest.

A week after the corporate watchdog began its investigation into the misappropriation of funds Ms Caddick booked shredding services for document destruction at her home address.

The last verified sighting of Ms Caddick was when ASIC and the Australian Federal Police raided her Dover Heights mansion on November 11, 2020.

Ms Caddick's mother Barbara Grimley holds ASIC responsible for her daughter's suspected death saying she was highly distressed during the raid and was not allowed any food or water.

The AFP's Constable Amelia Griffen shadowed Ms Caddick for the majority of the 12-hour search and confirmed she did make herself food and was allowed to leave the property whenever she wished.

Her husband Anthony Koletti phoned in the 49-year-old as missing some 30 hours after he says she walked out of their home for the last time on November 12 about 5.30am to "go for a jog".

Mr Koletti is due to give evidence following Ms Allen.

What Mr Koletti knew about Ms Caddick's disappearance has been the source of intense scrutiny in the first week of his wife's inquest.

The part-time hairdresser and DJ told police he was too busy working from home to make a statement in person and was subsequently visited at his home where he gave "conflicting stories," Sergeant Trent Riley told the coroner.

In February 2021 Ms Caddick's decomposing foot encased in an Asics shoe washed ashore at Bournda Beach on the NSW south coast, about 400km south of Sydney.

The inquest before Deputy State Coroner Elizabeth Ryan is set to resume on Monday after a week's break.

© AAP 2022

The inquest into the disappearance and suspected death of fraudster Melissa Caddick is due to resume with evidence from an investigator who helped uncover her multimillion-dollar fraud.

Isabella Allen from the Australian Securities and Investments Commission led the formal investigation from September 8, 2020, into Ms Caddick's Ponzi scheme operated under her fake company Maliver.

The conwoman purported to be investing her victims' wealth by appearing to set up CommSec trading accounts and forging documents to claim she was generating profits through capital growth and shares.

She preyed on mostly friends and family, and stole up to $30 million between 2013 and 2020, counsel assisting Jason Downing SC has told the inquest.

Meanwhile, Ms Caddick's luxurious five-bedroom, four-bathroom eastern suburbs home has come on the market, the prime asset in the estate of Caddick, 49, who disappeared on November 12, 2020.

The Dover Heights mansion boasts uninterrupted and expansive views of Sydney Harbour and a "stunning pool", which receivers hope will fetch at least $10 million.

Bruce Gleeson from Jones Partners, the receivers of Melissa Caddick and liquidators of Maliver Pty Ltd said the sale campaign would be conducted via an expressions of interest until October 31.

"We are also well advanced and close to finalising an application to the Federal Court which will seek sale orders regarding the designer jewellery, clothing and artworks," Mr Gleeson said in a statement on Monday.

A week after the corporate watchdog began its investigation into the misappropriation of funds, Ms Caddick booked document shredding services at her home address.

The last verified sighting of Ms Caddick was when ASIC and the Australian Federal Police raided her Dover Heights mansion on November 11, 2020.

Ms Caddick's mother Barbara Grimley holds ASIC responsible for her daughter's suspected death, saying she was highly distressed during the raid and was not allowed any food or water.

The AFP's Constable Amelia Griffen shadowed Ms Caddick for the majority of the 12-hour search and confirmed she did make herself food and was allowed to leave the property whenever she wished.

Her husband Anthony Koletti reported the 49-year-old as missing some 30 hours after he says she walked out of their home for the last time on November 12 about 5.30am to "go for a jog".

Mr Koletti is due to give evidence following Ms Allen.

What Mr Koletti knew about Ms Caddick's disappearance was scrutinised in the first week of his wife's inquest.

The part-time hairdresser and DJ told police he was too busy working from home to make a statement in person. Police subsequently visited him at home, where he gave "conflicting stories", Sergeant Trent Riley told the coroner.

In February 2021 Ms Caddick's decomposing foot encased in an Asics shoe washed ashore at Bournda Beach on the NSW south coast, about 400km south of Sydney.

The inquest before Deputy State Coroner Elizabeth Ryan will resume on Monday after a week's break.

© AAP 2022