FlutterShell macOS Backdoor via Malicious Google Ads
🟠High | Source: The Hacker News A macOS malvertising campaign called Operation FlutterBridge is distributing a new backdoor, FlutterShell, through malicious Google and YouTube advertisements. The campaign is an evolution of a previously identified threat cluster (JSCoreRunner/FileRipple) first observed in late 2025. This matters because it uses trusted ad platforms to target macOS users, broadening the attack surface beyond traditional phishing vectors. Architect’s Take: Enforce endpoint detection and response (EDR) tooling on all macOS devices, including developer and privileged-access workstations, and consider restricting or monitoring ad-network traffic at the corporate proxy or DNS layer. Review browser isolation and application allowlisting policies to limit the execution of unsigned or unnotarised binaries delivered via browser-based download prompts. ...