In a statement issued on Thursday, Freeman said the attack was identified and stopped and business operations had not been disrupted in any way.
The attack had been identified through what appears to be an intrusion detection system that monitors issues with the company's network. Freeman said the Medfin staff had begun a full and thorough investigation and acted to fix the issue..
“We have conducted an investigation and currently there is no evidence to suggest that personal information has been affected," he added.
“Medfin strongly condemns this malicious activity and continues to focus on protecting and serving our customers.”
Medfin provides financial services for medical practitioners and is part of the NAB Group.
Its servers are on a separate network and no NAB infrastructure or data was targeted by the attempted attack, Freeman said.
The company had worked with NAB’s cyber security team and the Australian Cyber Security Centre during the investigations, he added
“We’d like to thank our customers for their understanding and ongoing support. This event also demonstrates how important it is for all of us to be vigilant to the cyber security landscape due to the ever evolving and malicious intent of these types of attacks,” Freeman said.