China-Linked SprySOCKS Backdoor Expands to Windows with Advanced Stealth Techniques
In June 2026, cybersecurity researchers identified two new Windows variants of the previously Linux-exclusive backdoor, SprySOCKS. These variants, named WIN_DRV and WIN_PLUS, are equipped with hard-coded command-and-control configurations and support communication over TCP, UDP, and WebSocket protocols. Notably, WIN_DRV employs kernel drivers to conceal its network connections, processes, files, and registry keys, enhancing its stealth capabilities. The initial access method remains undetermined, but the group has a history of exploiting known vulnerabilities in public-facing applications to gain entry. This development underscores the evolving tactics of state-sponsored threat actors, particularly those linked to China, in adapting and expanding their malware across multiple operating systems. Organizations must remain vigilant and implement robust security measures to detect and mitigate such sophisticated threats.
Kill Chain
