Almost 80% of the malware affecting computer systems in the healthcare industry are trojans and the most common of them is Emotet, shows a report today. The typical infection chain begins with a legitimate-looking email that tries to persuade the victim to launch a malicious file. Telemetry data from security company Malwarebytes indicates that trojans are the most prevalent category of threats affecting healthcare computer systems is trojans. Malware posing as legitimate files from Microsoft is the second most common category of threats Malwarebytes encountered on healthcare systems. UK's National Health Services spent GBP 92 million to recover from WannaCry, yet the malware is in the top five ransomware threats affecting healthcare systems. The diversity of malware Malwarebytes detected seems to cover all types of threats since it also includes fileless malware, which leaves almost no trace on the infected host. Our telemetry data has revealed that, although nominal, fileless malware are present in healthcare organization systems, among them are within the health insurance and pharmaceutical sectors.