Introduction
From the disruptive days of WannaCry to the headline-grabbing MGM Resorts attack, ransomware has long plagued enterprises with devastating financial and reputational consequences. But as work shifts to the browser and cloud, a new threat vector is emerging—browser-native ransomware—and it’s changing the rules of engagement.
What Is Browser-Native Ransomware?
Traditional ransomware requires users to download a malicious file. But the modern enterprise doesn’t work from files anymore—it works from browsers and SaaS platforms.
Browser-native ransomware leverages identity attacks and OAuth-based access to hijack browser sessions without needing a file download. Once access is granted, AI agents can automate the attack: resetting passwords, locking out users, exfiltrating files, and holding cloud data hostage.
Key Features:
• No Downloads Required – Evades traditional endpoint detection.
• Identity Hijacking – Exploits browser authentication tokens.
• Cloud-First Targeting – Attacks enterprise-wide SaaS platforms like Google Workspace, OneDrive, Dropbox.
• AI-Powered Automation – Speeds up attack cycles with minimal attacker interaction.
A Real Shift in the Threat Landscape
SquareX has warned of vulnerabilities such as Polymorphic Extensions and Syncjacking, which are laying the groundwork for these types of ransomware. Unlike classic attacks targeting individual devices, browser-native ransomware compromises entire digital identities—potentially gaining access to shared drives across teams, clients, and partners.
What Can Enterprises Do?
As the browser becomes the new endpoint, traditional EDRs and anti-virus solutions are no longer sufficient. A new security posture is required:
Rethink Browser Security
Deploy browser-native protection tools that understand client-side application behavior and identity risks.
Strengthen Identity & Access Management (IAM)
Limit third-party app access and implement granular authentication policies.
Monitor for unusual behavior across SaaS and browser-based services.
Simulate & Test
Regular red teaming and browser-focused pen testing can reveal gaps in cloud and browser security.
*Conclusion
*
Browser-native ransomware is not just a theory—it’s the logical evolution of cyberattacks in a cloud-first world. As attackers follow users into the browser, it's critical for organizations to adapt their defenses accordingly.
Talk to Network Intelligence today to assess your browser and SaaS security posture—before attackers do.