NHS Grampian said it remains "completely confident" no patient data was accessed in the ransomware attack, which hit 13 health boards across the country and countless nationwide, leaving some with a backlog of postponed appointments to contend with.
The Home Secretary Amber Rudd will hold a meeting of the emergency COBRA committee later today.
Health secretary Jeremy Hunt has confirmed there has not been a second wave of cyber attacks on NHS trusts since the attacks on Friday.
The situation in Ireland is being monitored by the National Cyber Security Centre in the Department of Communications, Climate Action and Environment.
The spokesman for Dorset CCG said: "We are pleased to confirm that the Ransomware attack has had little impact on the health community in Dorset, however we continue to be vigilant".
A spokesperson for NHS Tayside said: "All 10 GP practices affected by the UK-wide cyber attack are now operating as normal with no disruption to appointments and services".
Rob Wainwright, director of the European Union's police agency (Europol), has revealed to various news agencies that the recent cyber-attack hit 200,000 victims in at least 150 countries. We have been working with 47 organisations providing urgent and emergency care who have been infected to varying degrees.More news: Dry weather lets Minnesota farmers catch up on planting
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The attack involved a malware called Wanna Decryptor, which encrypts files on a user's computer, blocking them from view and demanding a payment to release them.
MalwareTech, the United Kingdom security researcher that helped limit the ransomware attack, told the BBC on Sundaythat new attacks may be imminent.
Hospitals and GP surgeries were forced to turn away patients as the ransomware seized control of computers.
A spokesman for the trust said: 'The NHS is now experiencing issues due to the recent cyber-attack on May 12.
"The way these attacks work means that compromises of machines and networks that have already occurred may not yet have been detected, and that existing infections from the malware can spread within networks", Britain's National Cyber Security Center said Sunday.
You can protect yourself by installing updates, running anti-virus software and using firewalls.