ThreatCluster

CBO Cyber Attack and Everest Ransomware Claims

First seen 11 Nov 2025, 11:18 UTC •Research.Checkpoint •18

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On November 10, 2025, the US Congressional Budget Office confirmed a cyber attack by a suspected foreign actor, potentially exposing sensitive communications. Separately, on November 3, 2025, the Everest ransomware group claimed responsibility for attacks on AT&T, Dublin Airport, and Air Arabia, exfiltrating sensitive data including 576,000 AT&T applicant records.

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