The sinobi ransomware group listed Halcyontek on its data leak site on 2026-02-10. Country: US Sector: Technology Domains named: www.halcyontek.com Claim as published on the leak site: Halcyon is the industrys first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware. Halcyon is built by offensive security experts to stop attackers.