Sarcoma ransomware claims breach at giant PCB maker Unimicron

Sarcoma, a relatively new ransomware operation, claims to have stolen 377 GB of SQL files and documents from Unimicron, a major PCB manufacturer; Unimicron reported a ransomware-related disruption at its Shenzhen subsidiary on Jan 30 and has engaged external forensic support, while leaked samples published by Sarcoma appear authentic. The report highlights Sarcoma's rapid rise since October 2024, its use of phishing, n-day vulnerability exploitation, RDP and lateral movement, and notes concerns about supply-chain pivoting, though the company describes the impact as limited and investigation is ongoing.