Disruption to health services will continue in the coming days despite progress being made on restoring hospitals' IT systems.
A new version of the decryption tool made available to the HSE following the cyber attack has been developed and tested.
Some hospital labs and radiology systems have been restored and are operational.
Hackers have given the HSE until tomorrow to pay the ransom, and the Garda National Cyber Crime Bureau is monitoring the dark web for stolen data.
Adrian Weckler, Technology Editor with the Irish Independent, is warning people against sharing the information following a High Court injunction.
