Ransomware is one of the most persistent and devastating cyber threats, and attacks continue to dominate headlines around the world. For a deeper look at the most high-impact attacks of the past, explore our blog on the 5 biggest ransomware attacks in history.
In 2025, ransomware remains a serious and evolving threat—now more sophisticated, targeted, and dangerous than ever before. Our recent analysis of 28 key malware attack statistics reveals how cybercriminal tactics are advancing at a rapid pace. Recently, major cybersecurity firms like Palo Alto Networks and CrowdStrike have collaborated with Microsoft and Google to standardize the naming of hacker groups. This collaboration is designed to help security professionals connect insights more efficiently and respond to threats with confidence.
In this blog article, we are going to explore the most famous and notorious ransomware groups in the digital world in 2025.
Top 10 ransomware groups
Akira
A fast-emerging threat that supports attacks on both Windows and Linux environments. Akira has been increasingly used against mid-sized businesses through a growing Ransomware-as-a-Service (RaaS) model.
ALPHV / BlackCat
Highly innovative, BlackCat uses Rust-based malware and public leak sites to amplify pressure on victims. Known for targeting legal, healthcare, and retail sectors with disruptive tactics.
Clop
Specializing in data theft over encryption, Clop became infamous after the MOVEit breach. In 2025, it continues to exploit zero-day vulnerabilities, targeting education, finance, and supply chain software.
LockBit 3.0
LockBit remains one of the most dominant ransomware groups, known for its rapid encryption, RaaS model, and constant evolution. It frequently targets government agencies, transportation networks, and healthcare systems.
Medusa
Targets public institutions, including school systems and regional governments. Uses data leaks and extortion tactics that heavily impact public services and infrastructure.
NoEscape
A newer group targeting hybrid and cloud environments, often via managed service providers. Suspected links to ex-REvil and Conti developers give this group advanced capabilities from the start.
RansomHub
A rapidly growing group suspected of recruiting former affiliates of ALPHV. RansomHub has been involved in attacks on healthcare, education, and local government institutions.
Rhysida
Gains visibility by contacting journalists and publicizing data leaks. Rhysida’s victims include hospitals, NGOs, and local government entities, often with a high public impact.
Royal / BlackSuit
A selective and stealthy ransomware group. Known for custom-built encryptors and targeting critical infrastructure, law enforcement, and government systems with precision.
Final Thoughts
What are the effective ways to defend against these notorious ransomware groups? There is no silver bullet, but what we can do is holistic approach that combines proactive threat intelligence, strong cyber hygiene, modern security architecture like Zero Trust, and continuous workforce awareness training. Additionally, fostering collaboration, sharing knowledge, and engaging future oriented dialogue across sectors.
That is why the Global Cyber Conference 2025 is more relevant than ever. Bringing together cybersecurity leaders, policy makers, and researchers from around the world, attendees are going to explore resilient cybersecurity strategies. From ransomware trends to quantum security and AI-driven defense, Global Cyber Conference will tackle the most pressing topics that define the future of cybersecurity.
Join us in Zurich this October.
