There has been a twist in the class action lawsuit filed by victims of the 2015 Premera Blue Cross data breach. The plaintiffs allege Premera Blue Cross willfully destroyed evidence of data theft.
In 2015, Premera Blue Cross announced it was the victim of a cyberattack that resulted in cybercriminals gaining access to plan members’ protected health information.
The data breach was the second largest data breach ever to be reported by a healthcare organization, behind only the 78.8 million-record Anthem Inc., data breach that was also discovered in 2015. The protected health information of 11 million individuals was exposed as a result of the hack.
The Premera data breach was detected in January 2015, although the investigation revealed hackers had gained access to its network in May 2014. The attackers potentially had access to plan members’ protected health information (PHI) and personally identifiable information (PII) for 8 months before the intrusion was detected and access to data was blocked.
Unsurprisingly, given the scale of the breach, several class action lawsuits were filed by the breach victims. As was the case with the lawsuits filed in the wake of the Anthem data breach, they were consolidated into a single class action lawsuit. Anthem settled its class action lawsuit earlier this year, but the Premera Blue Cross lawsuit is ongoing.
A resolution does not appear to be getting closer. In fact, there has been a new twist in the case which is likely to delay an outcome further still. The plaintiffs have alleged that Premera Blue Cross destroyed key evidence that would have helped their case.
Alleged Destruction of Evidence of Data Theft
A third-party computer forensics firm, Mandiant, was retained to conduct an investigation into the breach. Mandiant determined that the hackers had compromised 35 Premera computers in the attack, and through those computers the attackers potentially had access to the records of 11 million plan members.
The cyberattack was not the work of amateurs. A well-known hacking group had conducted the attack and that group had succeeded in stealing data from other entities that it had attacked in the past.
While concrete evidence was allegedly not found to confirm that data had been exfiltrated, Mandiant did find fragments of RAR files on one of the computers that had been compromised. RAR files are compressed files that are used to make data transmission easier. The presence of the file fragments, which it is alleged were created by the attackers, suggests the hackers used RAR files to exfiltrate data and deleted the files to cover their tracks.
The plaintiffs requested all evidence uncovered during the Mandiant investigation be handed over, including the hard drives and forensic images of the 35 compromised computers. Premera responded to that request but claimed that it was only able to provide images for 34 out of the 35 computers as one computer, referred to in the court documents as A23567-D, had been destroyed. The computer was destroyed on December 16, 2016 – around a year after the litigation had started.
A23567-D is alleged to have contained important evidence that could confirm that data had been exfiltrated. That computer was the only one out of the 35 to contain a type of malware referred to by Mandiant as PHOTO. The malware was capable of registry modification, executing programs, and crucially, uploading and downloading files. The attackers communicated with that computer on a daily basis from July 2014 until January 2015 when the cyberattack was discovered and remote access was blocked.
“The destroyed computer was perfectly positioned to be the one-and-only staging computer hackers needed to create vast staging files for the purpose of shipping even more data outside of Premera’s network,” wrote the plaintiffs’ attorneys in the motion. “This computer functioned as the development machine for a software programmer, and as such was pre-loaded with a vast array of legitimate utilities that could be turned to any purpose.”
The computer appears to have been sent for destruction in error. It was deemed to be of no further interest to Premera and had reached end of life.
The problem for the plaintiffs is without any evidence of data theft, the case is unlikely to succeed. According to the motion, “Essentially, Premera maintains a ‘no harm, no foul’ defense, contending there can be no damage to any plaintiff unless he or she can prove confidential information was exfiltrated from Premera’s system.”
Whether accidental or willful, the destruction of the computer is extremely damaging to the case. The motion states that “Without access to that hard drive, trying to prove that the hackers removed plaintiffs PII and PHI through that computer is impossible.”
Additionally, the motion, filed in the U.S. District Court in Portland, claims that Premera Blue Cross failed to preserve data loss logs from its Bluecoat Data Loss Prevention (DLP) system, which potentially could have confirmed that plan members’ data had been stolen. It is alleged that those files were also deleted after the lawsuit was filed.
Premera Blue Cross issued a a statement to ZDNet in which it was confirmed that Premera disagrees with the motion and does not believe the facts of the case justify the relief the plaintiffs have requested. A response to the motion will be filed by Premera’s attorneys by September 28, 2018.
If the motion is granted, a federal judge would then instruct a jury that key evidence has been destroyed and that it should be assumed that the evidence confirmed data exfiltration had occurred. It would also not be possible for Premera to call in computer experts to testify that no data had been exfiltrated.
Even a favorable ruling would be no guarantee of success nor of a settlement being reached. In order for damages to be awarded, plaintiffs in the suit would still need to establish that they have suffered losses as a result of the data breach.
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