East Valley Community Health Center, with four locations serving the West Covina region of California, has notified 65,000 patients of a breach of protected health information following a ransomware attack.

“On October 18, an unknown individual logged into an (East Valley Community Health Center) server without authorization and installed Troldesh/Shade malware, encrypting (locking) the files that were stored on the server; this is also known as a ransomware attack,” the organization told patients in the letter.

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