Sinobi is a semi-private ransomware-as-a-service (RaaS) group first identified in June 2025 that operates through a carefully vetted network of trusted affiliates. The group employs a double-extortion strategy, combining traditional ransomware encryption with the theft of sensitive data. Victims are pressured to pay a ransom to restore access to their systems and prevent stolen information from being published on a dedicated leak site. This threat profile examines Sinobi’s operational structure, targeted industries and regions, known vulnerabilities, associated threat actors, and commonly used tools. The report also analyzes observed attack behaviors in Windows environments, maps techniques to the MITRE ATT&CK framework, and outlines the ransomware kill chain to illustrate how attacks prog

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