ATF Classifies Ransomware Attack as Major Incident Following Cybersecurity Breach

The U.S. ATF has declared a 'major incident' following a ransomware attack on a standalone system containing investigation targets, triggering congressional notification requirements. The Qilin ransomware gang claimed responsibility, though no evidence of data leaks was provided.

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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