The American Dental Association (ADA) was hit by a weekend cyberattack, causing them to shut down portions of their network while investigating the attack. The ADA is a dentist and oral hygiene advocacy association providing training, workshops, and courses to its 175,000 members. The ADA says that preliminary investigations do not indicate that member information or other data has been compromised. However, the description of this attack sounds like a ransomware attack, and almost every initial press statement says the same thing, with stolen data later published by threat actors. Soon after publishing this story, security researcher MalwareHunterTeam told BleepingComputer that the threat actors had begun leaking data allegedly stolen during the attack on ADA. The data leak site claims to have leaked approximately 2.8 GB of data, which the threat actors state is 30% of the data stolen in the attack. This data includes W2 forms, NDAs, accounting spreadsheets, and information on ADA members from screenshots shared on the data leak page. The leaking of dentists’ information can be particularly damaging, as small dental practices typically do not have dedicated security or network admins.