The US Office of the Comptroller of the Currency (OCC), a key banking regulator, officially classified a significant breach of its email system as a “major information security incident” after learning that malicious actors accessed highly sensitive bank supervisory data for eight to nine months before being detected.
On February 11, 2025, the OCC became aware of “unusual interactions” between a system administrative account and user mailboxes in its office automation environment. By February 12, the agency had determined that the activity was unauthorised, engaged its incident response mechanisms, reported the problem to CISA (Cybersecurity Infrastructure and Security Agency), and blocked the compromised administrative accounts, effectively terminating the unauthorised access.
However, subsequent investigations, including internal evaluations and those conducted by independent third parties, revealed that the infiltration was much larger than previously thought. According to Bloomberg News, citing sources familiar with the investigation, the unauthorised access began in May or June 2024 and was discovered in February 2025. During this prolonged period, the attackers gained access to around 150,000 emails from 100 to 103 accounts, including those of senior OC
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