Feds Warn Health, Other Sectors of Interlock Threats

Healthcare Providers Are Among Dozens of Entities Hit Since Gang Emerged in 2024 Marianne Kolbasuk McGee (HealthInfoSec) • July 23, 2025

U.S. authorities are warning of threats posed by double-extortion gang Interlock, which has been hitting an assortment of businesses across many industries, including healthcare and other critical infrastructure sectors, with a ransomware variant first seen in September 2024.

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The joint alert on Tuesday from the Cybersecurity and Infrastructure Security Agency, the FBI, the U.S. Department of Health and Human Services and the Multi-State Information Sharing and Analysis Center said Interlock, which exfiltrates data then encrypts victims' systems with ransomware, has been targeting organizations across North America and Europe.

As of Wednesday, Interlock's dark website included a long list of alleged victims across many sectors, including healthcare providers, schools, construction ...