Ransomware and other cyber attacks have seen a sharp rise this year, and hospitals have been particularly vulnerable since the start of the global pandemic. Since July, hospitals in states including New York, Nebraska, Ohio, Missouri and Michigan have all been attacked by some form of ransomware.
A Trump administration official told CNN that several hospitals have been targeted in the attacks over the past two days, and while it's still early, the official said the incidents may be connected. The federal government is investigating the attacks, the official said.
So far, Universal Health Services, a hospital health care service company based in Pennsylvania; St. Lawrence Health Systems in New York; and the Sky Lakes Medical Center in Oregon all confirmed to CNN that they were targeted over the past few days.
Experts with Mandiant, a cybersecurity firm, said they identified at least three attacks on Tuesday and one on Wednesday, with patients getting diverted to other hospitals as a result.
"We are experiencing the most significant cyber security threat we've ever seen in the United States," Charles Carmakal, SVP and CTO of Mandiant, said. "An Eastern European financially motivated threat actor, is deliberately targeting and disrupting U.S. hospitals, forcing them to divert patients to other healthcare providers. Patients may experience prolonged wait time to receive critical care."
Allan Liska, an intelligence analyst for the firm Recorded Future, told CNN that his company knows of at least six attacks in the last 24 hours and "there are probably more."
It is "absolutely the biggest thing we've ever seen. In terms of ransomware it's the biggest attack we've ever seen," he said, adding that it's "crushing to see so many hospitals hit at the same time."
Chris Krebs, director of CISA, warned health care and public health individuals to have their "shields up! Assume Ryuk is inside the house. Executives - be ready to activate business continuity and disaster recovery plans. IT sec teams - patch, MFA, check logs, make sure you have a good backup point."
In a statement from the St. Lawrence Health Systems, the virus has been identified as a new variant of Ryuk ransomware, previously unknown to antivirus software providers and security agencies.
Universal said in a statement that upon learning of the attack, it "disconnected all systems and shut down the Network to prevent further propagation. While the Network was offline, patient care was delivered safely and effectively at our facilities across the country using established back-up processes, including offline documentation methods."
It is not known who carried out the attacks, but overall, the incidents represent a solid expansion of hospital targets in a short period of time who have sought to take advantage of the crush facing hospitals in the wake of the global pandemic.
Ransomware can have devastating effects. Most recently, it crippled the IT network of a German hospital resulting in the death of a woman seeking emergency treatment.
According to Microsoft Corporate Vice President for Customer Security and Trust Tom Burt, Ryuk is a sophisticated crypto-ransomware because it identifies and encrypts network files and disables Windows System Restore to prevent people from being able to recover from the attack without external backups. Ryuk has been attacking organizations, including municipal governments, state courts, hospitals, nursing homes, enterprises and large universities.
According to Burt, Ryuk has been attributed to attacks targeting a contractor for the Department of Defense, the North Carolina city of Durham, an IT provider for 110 nursing homes and a number of hospitals during the Covid-19 pandemic.