In response to a query from iTWire, an MHC spokesman said: "We have started to bring our core IT infrastructure online and are currently rolling this out across our hospital network."
The FBI described a Hive attack this way: "After compromising a victim network, Hive ransomware actors exfiltrate data and encrypt files on the network.
"The actors leave a ransom note in each affected directory within a victim’s system, which provides instructions on how to purchase the decryption software.
There has been no change in the entry for this attack on the website used by the Hive gang on the dark web, indicating that there is no move to push for a ransom.
The spokesman added: "Our patient services have continued without interruption and we sincerely thank all our patients and clinicians for their ongoing support.
"Our staff have been amazing during this extremely difficult period."
Last Friday, the organisation said it was making good progress in the recovery and restoration of its IT systems.
Macquarie Health, which will mark 50 years in 2023, runs 12 hospitals which provide surgical procedures, rehabilitation and mental health clinics, skin imaging and dermascopy, medical systems; cosmetic procedures, e-health informatics and data solutions.
The companies under its banner are Macquarie Hospital Services, MacRehab, Macquarie Medical Systems, Derma Medical and Machealth eSolutions.