The alleged operation took place on July 17 and targeted systems used by Gazprom and its subsidiaries, which Ukraine's intelligence claims are directly involved in supporting Russia's war effort.
Gazprom is Russia's state-owned energy company, one of the world's largest gas producers and exporters.
The cyberattack allegedly destroyed large volumes of data and installed custom software designed to further damage the company's information systems.
"The degradation of Russian information systems to the technological Middle Ages continues," the source within the HUR told the Kyiv Independent.
According to the source, access to Gazprom's internal systems was disabled for nearly 20,000 system administrators, and backup copies of key databases were wiped.
The attack reportedly affected approximately 390 subsidiary companies and branches, including Gazprom Teplo Energo, Gazprom Obl Energo, and Gazprom Energozbyt.
Gazprom and Russian authorities have not publicly commented on the reported incident. »