"Russian Cyber Incursion: Months Inside Ukraine's Telecoms Amidst War Tensions"

Russian hackers infiltrated the systems of Ukraine's largest telecom operator, Kyivstar, from at least May 2023, causing significant service disruptions for millions of users in December. The Security Service of Ukraine (SBU) believes the group behind the attack is Sandworm, a Russian military intelligence cyber unit. The attack aimed to deliver a psychological blow, gather intelligence, and caused extensive damage to Kyivstar's infrastructure. Despite the severity, no major impact on Ukraine's military communications was reported, and personal data leaks have not been confirmed. The SBU and Kyivstar are working closely to investigate and prevent future cyber threats.