Pierluigi Paganini May 29, 2023

Managed Care of North America (MCNA) Dental disclosed a data breach that impacted more than 8.9 million individuals.

Managed Care of North America (MCNA) Dental suffered a data breach that impacted 8,923,662 patients.

MCNA Dental is one of the largest US dental care and oral health insurance providers.

The security breach exposed the personal information of current or former provider of dental/orthodontic care to members of certain state Medicaid and Children’s Health Insurance Programs, for which MCNA provides dental benefits and services.

According to the notification filed with the Office of the Maine Attorney General, the company discovered unauthorized access to its computer systems on March 6th, 2023, and immediately launched an investigation into the incident.

“On March 6, 2023, MCNA became aware that an unauthorized party was able to access certain MCNA systems. Upon discovery the same day, MCNA took immediate steps to contain the threat and engaged a third-party forensic firm to investigate the incident and assist with remediation efforts. MCNA subsequently discovered that certain systems within the network may have been infected with malicious code. Through its investigation, MCNA determined that an unauthorized third party was able to access certain systems and remove copies of some personal information between February 26, 2023 and March 7, 2023.” reads the data breach notification. “MCNA undertook an extensive review to determine what data may have been impacted. As a result of this review, which was completed on May 3, 2023, it appears that your personal information may have been involved.”

Stole data includes demographic information to identify and contact patients, such as full name, date of birth, address, telephone and email; Social Security number; driver’s license number or government-issued identification number; health insurance information, such as name of plan/insurer/government payor, member/Medicaid/Medicare ID number, plan and/or group number; and information regarding dental/orthodontic care. The notice states that not all data elements were involved for all individuals.

The company announced that it has already taken steps to mitigate and prevent similar security breaches in the future.

The company is offering the impacted individuals 12 months of free identity theft protection and credit monitoring service through IDX.

“Although we are unaware of any actual or attempted misuse of provider information as a result of this incident, we encourage you to carefully review credit reports and statements sent from providers as well as your insurance company to ensure that all account activity is valid. Any questionable charges should be promptly reported to the company with which you maintain the account.”

The notice doesn’t provide details about the security breach, but the LockBit ransomware group claimed responsibility for the attack.

The ransomware group added the company to the list of victims on its Tor leak site and published a sample of the stolen data as proof of the data breach.

LockBit threatened to publish the stolen data if MCNA would have not paid a $10 million ransom.

On April 7th, 2023, LockBit released all stolen data on its leak site.

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, MCNA)