FlowerStorm Phishing Adopts Browser VM Obfuscation
🔒 Researchers at Sublime Security reported that the FlowerStorm phishing-as-a-service campaign has begun using KrakVM, an open-source browser-based JavaScript virtual machine, to conceal credential-stealing code inside HTML attachments. When victims open the attachments in a browser, encrypted bytecode is executed by the VM and launches a dynamic credential- and MFA-harvesting workflow. The kit supports real-time AiTM interception and adapts phishing pages to the victim’s provider and branding, complicating static analysis and many email defenses.
