Latitude Financial is refusing to co-operate with cyber attackers, saying it will not reward criminal behaviour as it is faced with a ransom demand.
Australian police have taken part in a multinational crackdown on a sprawling online marketplace popular with cybercriminals, arresting 10 Australian suspects.
Queensland University of Technology has been hit by a cyber attack and IT systems have been shut down as a precaution.
Russian hackers have released more sensitive information and are threatening more is to come, as Medibank faces potential legal action over the hack.
Australia has sent a pointed message to Russian cyber criminals believed to be behind the Medibank data theft saying it will "hack the hackers".
The federal government is examining whether to ban companies from paying ransoms to hackers should they suffer a data breach.
Australian Federal Police chief Reece Kershaw says a Russian network was behind the hacking of data held by health insurance giant Medibank.
A ransomware group claiming to have Medibank customer data has threatened to release it in 24 hours as the FBI provides federal police help to catch the gang.
Health insurer Medibank won't pay any ransom fee to the hacker that accessed the personal data of all its customers.
Hackers have targeted a communications platform used by Australian military personnel but Defence says none of their data appears to have been stolen.
The federal cyber security minister has warned attacks on large companies could become more common, after an incident at Medibank.
Telecommunications giant Optus has taken out full-page ads to apologise to millions of customers affected by a massive data breach.
Optus customers have been told to be wary of scammers trying to take advantage of a data breach, as the telco continues to contact those who have been affected.
A 24-year-old Melbourne man faces six charges after he allegedly created spyware software used by domestic violence perpetrators and other criminals globally.
A joint investigation by Queensland police and the crime watchdog have charged a former officer with hacking and disclosing official secrets.
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