The German subsidiary of the Russian energy company Rosneft has reported a cyberattack, die Welt newspaper reported on Sunday, citing the country's BSI cybersecurity watchdog.
The paper said the BSI had offered support to overcome the problem, which occurred on Friday night or early Saturday morning, and had issued a cybersecurity warning to other companies in the energy sector.
So far, there had been no effect on Rosneft's business or the supply situation even though the company's systems had been affected, the newspaper said.
Die Welt cited security sources as saying that the hacker group Anonymous was suspected of perpetrating the attack which, it said, was in response to Russia's invasion of Ukraine.
No one was immediately available at the BSI or at Rosneft Deutschland to comment.
Der Spiegel also reported on the cyberattack, adding that the BKA federal criminal police office was investigating. No one at the BKA was immediately available to comment.