PALO ALTO, Calif. — In late 2013, an A.T.M. in Kiev started dispensing cash at seemingly random times of day. No one had put in a card or touched a button. Cameras showed that the piles of money had been swept up by customers who appeared lucky to be there at the right moment.
A hacker broke into part of the HealthCare.gov insurance enrollment website in July and uploaded malicious software, according to federal officials. Investigators found no evidence that consumers’ personal data were taken or viewed during the breach, federal officials said.