October 2019 · Large veterinary group
Ransomware reaches hundreds of hospitals
National Veterinary Associates, a group of roughly 700 animal-care facilities, discovered a Ryuk ransomware attack on a Sunday morning. About 400 locations were affected. Reporting described core Microsoft servers being hit and many practices losing access to their patient-management systems.
Lesson: attackers strike on weekends and holidays, and shared central systems can spread one incident across every clinic. Monitoring has to be 24/7, and multi-site networks need segmentation.
Source: KrebsOnSecurity, "Ransomware Bites 400 Veterinary Hospitals" (Nov. 2019)
July 2021 · Independent animal hospital
A small clinic loses years of records
York Animal Hospital in Maine was hit over the Fourth of July weekend. Local news reported a ransom demand of about $80,000 in bitcoin. The server and backup data were wiped, and the practice rebuilt from a years-old copy and paper records, asking clients to help restore their pets' history.
Lesson: backups attached to the same network can be destroyed along with everything else. Keep an offline or immutable copy, and test restoring it.
Sources: WGME (July 2021); Sun Journal (July 2021)