Founded in 1945 in Chicago, Illinois, Seyfarth has over 900 lawyers across 17 offices, providing clients all around the world with advisory, litigation, and transactional legal services. The Am Law 100 firm serves more than 300 of the Fortune 500 companies.

Over the weekend, the company fell victim to a ransomware attack that spread aggressively across its network and forced it to shut down its email service and other systems.

The firm says it was able to stop the attack soon after detection, but not before data on many systems was encrypted by the malware.