The ransomware has been confirmed by users of Apple Support Communities, where one customer (identified as veritylikestea on Apple’s forums) relays his experience as follows:
Well, using two-factor authentication can help, and setting a passcode lock on your device would also prevent the hacker from holding it hostage.
iPad, iPhone and Mac owners in Queensland, NSW, Western Australia, South Australia and Victoria have reported having their devices held hostage. Apple allows customers to enable two-factor authentication at http://support.apple.com/kb/ht5570.
The Sydney Morning Herald cites IT security expert Troy Hunt as saying that the hackers are using compromised login credentials from recent data breaches to hold the devices hostage. The gist of it is this: using the same password across multiple online services can put it at risk.
According to the report, customers in Queensland, NSW, Western Australia, South Australia and Victoria have all reported the hack, with some even getting logged out of their Macs. Apple can do little to alleviate the issue, but customers are told to consider changing their Apple ID passwords once they regain control of their iDevice.
Affected users must contact Apple directly to regain access to their account, according to the Australian newspaper.