The attack was similar to earlier hacks perpetrated at insurers, Premera and Anthem, with similar methods used. A fake website was set up to capture information which closely mimicked the domain name of the real site, and preliminary investigation points towards a Chinese source of the attacks. CareFirst Blue Cross BlueShield stated that the attackers gained names, birthdates, email addresses, and insurance ID numbers, but not Social Security or credit card numbers, passwords, or medical information.
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