US Cyber Agency Questioned Over Response to Massive Health Hack

A trio of US senators asked the federal government’s lead cybersecurity agency to explain its response to a February ransomware attack on an insurance company that paralyzed much of the country’s health-care system.

The group, led by Senator Elizabeth Warren, a Massachusetts Democrat, on Monday asked the US Cybersecurity and Infrastructure Security Agency to share details of its role in addressing the breach of Change Healthcare, a unit of UnitedHealth Group Inc., which snarled billions of dollars of payments and saw hackers make off with patient medical data. The letter also requested a broader picture of the risk posed ...