Correction: In a phone call, Finalsite said it was 5,000 schools affected, not 5,000 school districts.
Some 5,000 school websites were reportedly made inaccessible this week after a ransomware attack on the company that hosts those sites. Three days later, the company is still trying to restore full functionality.
"On Tuesday, January 4, our team identified the presence of ransomware on certain systems in our environment," Finalsite said on a status update page Thursday. "We immediately took steps to secure our systems and to contain the activity."
Finalsite said it launched an investigation with third-party forensic specialists. It said there was no evidence that Finalsite or client data was stolen.
"This incident was not directed at any specific schools, but the Finalsite database as a whole," Finalsite said in a statement, "Data contained within these websites is limited to demographics (name, email address)."
Finalsite said it does not store personal information such as school records, credit card information or social security numbers.
Company spokesperson Morgan Delack said 5,000 of the company's 8,000 customers were affected. Finalsite services school districts as well as individual customers including charter and international schools. A list of affected schools was not available.
A Reddit user claimed on Thursday that the outage prevented some schools from sending out alerts about school closures or COVID-19 protocols.
Delack said she could not provide details about how the ransomware got into Finalsite's system, saying the investigation was ongoing.
Former FBI analyst Crane Hassold, now director of threat intelligence at Abnormal Security, told ZDNet that this attack was similar to one last year on Kaseya, noting the trickle-down effect ransomware can have.
"When a company that provides solutions for other companies gets hit with ransomware, similar to what we saw with Kaseya last summer, the resulting impact can be exponentially devastating," Hassold said.
Finalsite is based in Glastonbury, Conn., with offices in the United Kingdom. School districts it serves include Kansas City, Tacoma, Wash., and Avon Grove, Pa.