Title insurer Fidelity National Financial (FNF) said about 1.3 million customers have been impacted by a cyber attack it suffered last November.

According to a filing with the U.S. Securities and Exchange Commission, FNF became aware of a cybersecurity incident on Nov. 19 and contained it on Nov. 26.

White it initially blocked access to certain systems—including those related to providing title and mortgage services—they were restored by the end of November.

Following a forensic investigation, completed last month, the Jacksonville, Fla.-based company said in the Jan. 9 SEC filing that it determined “an unauthorized third-party accessed certain FNF systems, deployed a type of malware that is not self-propagating, and exfiltrated certain data.”

FNF said it has notified affected customers, state attorneys general and regulators and is “continuing to coordinate with law enforcement, its customers, regulators, advisors and other stakeholders.” The company is providing credit monitoring and identify theft restoration services to customers.

FNF said in a SEC filing that it has been named as a defendant in several lawsuits related to the incident and “will vigorously defend itself against any litigation” filed as result of the cyber attack.

The company is one of four that dominates the title insurance marketplace.

This article was originally published by Insurance Journal. Reporter Chad Hemenway is the National Editor of Insurance Journal.

Related article about competitor First American Financial Corporation: Title Insurer Reports Another Cybersecurity Event; Fitch Monitoring Ratings