Russia-Linked Seashell Blizzard Intensifies Cyber Operations Against Critical Sectors

Seashell Blizzard, a Russia-linked threat actor, has intensified cyber operations against critical sectors globally, including energy, oil and gas, telecommunications, shipping, arms manufacturing, and international governments. The group, known for its espionage and disruptive attacks, has been using a subgroup to gain initial access to internet-facing infrastructure and establish long-term persistence within targeted entities. Seashell Blizzard has shifted its targeting strategies, relying more on exploiting trusted third-party service providers and social engineering tactics like phishing to infiltrate high-value networks. ​