How the ransomware attack at Change Healthcare went down: A timeline | TechCrunch

Ransomware attack on Change Healthcare likely stands as one of the largest data breaches of U.S. health and medical data in history.

Change Healthcare processes billing and insurance for hundreds of thousands of hospitals, pharmacies and medical practices across the United States .

At least 100 million people are now known to be affected by the February data breach.

The company shut down its entire network to isolate intruders it found in its systems.

Change Healthcare received a “safe” copy of the stolen data that it had just days earlier paid $22 million for.

U.S. government offered $10 million for information leading to ALPHV/BlackCat's capture.

Change Healthcare began poring through the dataset to determine whose information was stolen in the cyberattack, with the aim of notifying as many affected individuals.

The data breach at Change Healthcare is now the largest digital theft of U.S. medical records.

UnitedHealth confirmed in late June that it would begin notifying those whose healthcare data was stolen in its ransomware attack on a rolling basis.

The number of those affected is expected to rise, given some have received notifications as recently as October .