The agency said it detected anomalous activity in the FFE Direct Enrolment pathway for agents and brokers.
The group has continued its activity - despite the arrest last year of alleged group leaders - implementing sophisticated spear-phishing campaigns throughout 2018 and distributing malware to each target through specially tailored emails.
The US Centres for Medicare & Medicaid Services (CMS) said on Friday it was responding to a data breach that exposed the files of about 75,000 individuals.
The agency said it detected anomalous activity in the Federally Facilitated Exchange’s (FFE) Direct Enrollment pathway for agents and brokers.
The number of files accessed in the breach represented a small fraction of consumer records present on the FFE, the CMS said.
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