Romanian Energy Provider Oltenia Hit by Gentlemen Ransomware Attack

Romanian Energy Provider Oltenia Hit by Gentlemen Ransomware Attack

First seen 29 Dec 2025, 17:19 UTC •Agerpres.RoBleepingcomputerSecurityaffairs.CoDig.WatchIndustrialcyber.Co •59.3

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On December 26, 2025, Oltenia Energy Complex, Romania's largest coal-based energy producer, suffered a ransomware attack known as 'Gentlemen'. The attack disrupted the company's IT infrastructure, encrypting several documents and files, and rendering multiple IT applications temporarily unavailable, although it did not threaten the National Energy System's operation.

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