The Rehab Group, one of the State's largest disability services provider, has fallen victim to a cyber attack.
The group informed the Data Protection Commissioner (DPC) that some of its systems have been compromised by malware.
“We have convened our serious incident management team and are working with cyber security experts to resolve this issue,” it said in a statement.
“The matter is now contained, with forensic investigation work underway and continuing through the weekend,” it said.
"There is no evidence as yet that data has been accessed from the servers or any evidence of financial loss," Rehab said, noting it had informed the Health Service Executive (HSE) and other stakeholders.
It said it had engaged with the Garda National Cyber Crime Bureau and the National Cyber Security Centre and is deploying its full resources to bring the targetted systems "safely back online."
Rehab is one of several service providers here to have been targetted in a cyber attack.
The HSE is due to begin notifying people whose data was compromised during the cyber attack last May.
