Diamond Sleet compromising nuclear energy organizations (spring 2023) and maritime entities (fall 2022)

Microsoft Digital Defense Report

Diamond Sleet, a North Korean threat actor known for its destructive attack targeting Sony Pictures in 2014, was observed targeting and compromising nuclear energy organizations globally in the spring of 2023. ... In the fall of 2022, Diamond Sleet was also observed compromising maritime entities, with a focus on submarine technologies.