Feds warn healthcare of Interlock ransomware threat

Becker's Healthcare July 23, 2025
Naomi Diaz

The FBI, Cybersecurity and Infrastructure Security Agency, Department of Health and Human Services, and the Multi-State Information Sharing and Analysis Center have issued a joint cybersecurity advisory warning organizations of an emerging ransomware variant known as Interlock.

Here are five things to know about the ransomware variant:

1. Interlock ransomware has been used in attacks on businesses and critical infrastructure across North America and Europe since September 2024, according to a July 22 advisory.
2. The financially motivated variant uses a “double extortion” tactic — encrypting victims’ data and exfiltrating...

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