CareFirst BlueCross BlueShield first learned in May 2014 of malware on an information system that was hacked a month later, according to two health information security consultants. But the Blues plan apparently did not realize the malware was not completely eradicated and the system was hacked a month later.

This spring, as other health insurers including Anthem and Premera were announcing huge cyber attacks, CareFirst contracted with security firm Mandiant to conduct an end-to-end examination of its IT environment and the breach was found, CareFirst acknowledged on May 20.

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