Operation FlutterBridge: macOS Malvertising Campaign Spreads New FlutterShell Backdoor

Operation FlutterBridge is a malvertising campaign specifically targeting macOS users. The campaign distributes a new backdoor called FlutterShell, which is built using the Flutter framework. This represents a novel approach to macOS malware distribution through malicious advertising. The use of Flutter framework for backdoor development is a notable technique. The campaign demonstrates ongoing threats against Apple's macOS platform through web-based attack vectors.