Operation FlutterBridge: macOS Malvertising Campaign Spreads New FlutterShell Backdoor

Reported 02 Jun 2026 by otx · Severity: medium

A financially-motivated cybercrime cluster designated CL-CRI-1089 has launched Operation FlutterBridge, deploying FlutterShell backdoor malware targeting macOS systems through malvertising. Built with the Flutter framework, FlutterShell masquerades as legitimate applications incl