Top 10 Ransomware Groups of 2025

This report ranks and profiles the Top 10 ransomware groups of 2025, describing how the ecosystem fragmented into collaborative and cartel-like structures where affiliates reuse tooling and access, and how attackers prioritized identity abuse (OAuth/MFA bypass), supply-chain and enterprise software zero-day exploitation, and double-extortion leak sites; it highlights high-impact groups (e.g., Qilin, Akira, Cl0p) with large victim counts and real-world consequences, and recommends prioritizing threat actor, vulnerability, and supply-chain intelligence to detect behavioral signals early.