National pharmacy network PharMerica last week started sending out notification letters to more than 5.8 million individuals to disclose a data breach that occurred in March.
Owned by BrightSpring Health, a provider of home and community-based health services, PharMerica operates over 2,500 facilities across the US and offers more than 3,100 pharmacy and healthcare programs.
On Friday, PharMerica informed the Maine Attorney General’s Office that the personal information of more than 5.8 million individuals was compromised after an unauthorized party accessed its computer systems in March.
The data breach, the company says in notification letters sent to the impacted individuals, occurred between March 12 and March 13.
Personal information compromised during the incident includes names, addresses, birth dates, Social Security numbers, health insurance, and medication information.
In some cases, the compromised information belongs to deceased individuals, and PharMerica encourages executors or surviving spouses to contact the national credit reporting agencies to notify them of the situation.
PharMerica’s letter does not provide details on the type of cyberattack that it suffered, but it appears that the Money Message ransomware group is responsible for the incident.
In April, the group started leaking personally identifiable information (PII) and protected health information (PHI) allegedly stolen from PharMerica.
Last month, the ransomware operators told DataBreaches.net that they encrypted almost the entire PharMerica infrastructure and that they had engaged in negotiations with the company.
Responding to an inquiry, PharMerica informed SecurityWeek that, on May 15, it posted a data breach notice on its website and issued a press release to notify the public of the personal information theft. However, the company made no mention of ransomware being used in the attack.
*updated with information from PharMerica
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