China the likely culprit in massive Cyber attack on Australia, page-81

I am still waiting for details of this supposed massive cyber attack the PM announced.

There is no specific massive attack.
The frequency of attacks have increased from around the time Australia made a rule that denied Huawei access to our 5G rollout.
That has annoyed the Chinese Government.
What the "hackers" are doing is taking advantage of unpatched software to spy and collect information to add to their database.
Information that could be useful one day for any number of reasons.
These particular attacks aren't particularly sophisticated.
The PM's announcement is a reminder to patch software.