ATF Declares Major Cybersecurity Incident Following Ransomware Attack

The U.S. ATF declared a 'major incident' after a ransomware attack on a standalone system containing investigation targets, with Qilin ransomware gang claiming responsibility. Federal law requires agencies to notify Congress within a week of such incidents, which could impact national security and broader U.S. interests.

The ATF is the latest federal government agency in recent years to notify Congress of a "major incident" involving its cybersecurity.

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