The group say it's dismantled nearly 3,000 malicious domains and identified more than a 2,000 software vulnerabilities.
It's the latest sign that malicious hackers aren’t holding off attacking health care facilities during the pandemic.
The Brno University Hospital has been conducting regular tests for the novel coronavirus, according to media reports.
This time the intrusion "was an extremely sophisticated attempt against us that had the intention to leave no traces of the intruder or their purpose,” the company's CISO says.
Four Bulgarians were arrested Thursday as part of an international police effort.
The Intelligence Support Systems World Conference has expanded to bring thousands of prominent spies, police, hackers and powerful bureaucrats together to spend money on some of the latest and greatest in retail spying kits.