Cadet Blizzard (DEV-0586) is a Russian GRU-sponsored threat group that Microsoft began tracking following disruptive and destructive events occurring at multiple government agencies in Ukraine in mid-January 2022. During this time, Russian troops backed with tanks and artillery were surrounding the Ukrainian border as the military prepared for an offensive attack. The defacements of key Ukrainian institutions’ websites, coupled with the WhisperGate malware, prefaced multiple waves of attacks by Seashell Blizzard (IRIDIUM) that followed when the Russian military began their ground offensive a month later. Primary targeted sectors include government organizations and information technology providers in Ukraine, although organizations in Europe and Latin America have also been targeted. We assess that Cadet Blizzard has been operational in some capacity since at least 2020 and continues to perform network operations through the present. Cadet Blizzard compromises and maintains a foothold on affected networks for months, often exfiltrating data prior to disruptive actions. Microsoft observed Cadet Blizzard’s activity peak between January and June 2022, followed by an extended period of reduced activity.
The group re-emerged in January 2023 with increased operations against multiple entities in Ukraine and in Europe, including another round of website defacements and a new “Free Civilian” Telegram channel affiliated with the hack-and-leak front under the same name that first emerged in January 2022, around the same time as the initial defacements. Cadet Blizzard actors are active seven days of the week and have conducted their operations during their primary European targets’ off-business hours. Microsoft assesses that NATO member states involved in providing military aid to Ukraine are at greater risk.
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