Delta Dental of California Says 6,928,932 Individuals Affected by MOVEit Hack
Delta Dental of California has recently confirmed that it was one of the victims of Clop hacking group’s mass exploitation of a zero-day vulnerability in Progress Software’s MOVEit Transfer solution. Delta Dental of California, part of the Delta Dental Plans Association, provides dental insurance to 45 million people. According to the breach notification sent to the Maine Attorney General, the information of almost 7 million individuals was stolen in the attack, including members of Delta Dental of California plans and those of its affiliates.
Delta Dental discovered on June 1, 2023, that the SQL injection vulnerability – CVE-2023-34362 – in the MOVEit Transfer solution had been exploited. Progress Software had released an emergency patch to fix the flaw on May 31, 2023; however, the Russia-linked Clop group exploited the flaw between May 27 and May 30, 2023, before the patch was applied and exfiltrated data from Delta Dental’s MOVEit server.
On July 6, 2023, Delta Dental confirmed that plan members’ data had been accessed and acquired without authorization, and third-party computer forensics experts were engaged to help with analytics and data mining to determine exactly what data had been stolen. Due to the extent of the data involved, the analysis has only just been completed, with the final list of the affected individuals and types of data involved finalized on November 27, 2023. Notification letters started to be sent to those individuals on December 14, 2023.
Delta Dental said the stolen data includes names in combination with one or more of the following: address, Social Security number, driver’s license number, other state identification number, passport number, financial account information, tax identification number, individual health insurance policy number, and/or health information. The affected individuals have been offered 24 months of complimentary credit monitoring and identity theft protection services.
Delta Dental stressed in its notification letters that this was a mass exploitation incident that affected thousands of companies; however, the Delta Dental of California data breach stands out due to the number of individuals affected. With 6,928,932 dental plan members affected, this is the third largest healthcare MOVEit-related breach to have been reported, behind Maximus Inc. (11 million) and Welltok (8.5 million).
The HIPAA Breach Notification Rule requires notification letters to be issued within 60 days of the discovery of a breach. The Delta Dental of California data breach was reported to the HHS’ Office for Civil Rights on September 6, 2023, within 60 days of discovering that PHI was involved. It was unclear at the time how many individuals were affected so an interim figure of 501 was used. “The delay between detecting the incident, responding to it, and identifying what data has been accessed and by whom, along with which individuals are impacted is not surprising. To determine this typically relies on specialist digital forensic and incident response providers who need to forensically comb through logs and individual data objects using a combination of forensic tools and deep cybersecurity expertise to piece together what happened down to the individual data objects,” Claude Mandy, Chief Evangelist, Data Security at Symmetry Systems, told The HIPAA Journal. “Modern data security tools can speed up the identification of what data is impacted, particularly at scale, so hopefully we will see these timeframes reduce as these tools get adopted. However, it will still take time to map those data objects to the individuals impacted at scale with forensic quality that can stand up in court.”
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