The qilin ransomware group listed sky on its data leak site on 2025-06-03. Country: SG Sector: Manufacturing Domains named: skymac.sg Claim as published on the leak site: Established in 1987, Sky-mac is specialised in Air-Conditioning and Mechanical Ventilation (ACMV), HVAC system, related services, which encompasses the designing, installation, service, maintenance and repair of ACMV systems. Sky-mac has o ...