The scammer says there's an issue with your computer and they're calling to help you fix it. They then try to coax you into actions that could actually compromise your computer or reveal bank information.
The scammers might ask you to enter a URL into your web browser or ask for your bank account details to transfer money, supposedly to prove whether you have been hacked. Other scammers will try to convince you to buy software to fix the fake problem.
Some scammers have even pretended to be from us at the Australian Cyber Security Centre (ACSC), but we would never contact you by phone to request access to your computer, ask you to install software or request financial information.