QuickFox Supply Chain Attack Delivers FDMTP Backdoor via Trojanized Windows Installer

Cybersecurity researchers have disclosed what has been described as a “long-standing supply chain attack” on QuickFox, a virtual private network (VPN) and network acceleration tool designed for overseas Chinese users.

According to Fortinet FortiGuard Labs, the supply chain attack has been ongoing since at least August 2025 and involves a trojanized version of the application to deliver FDMTP, a