China-Linked SprySOCKS Backdoor Expands to Windows with Driver-Based Stealth
Incidents: China's Earth Lusca group deploys stealthy Windows variants of SprySOCKS backdoor, targeting governments with kernel-level evasion and UEFI bootkit capabilities.
Deep Analysis and Expert Commentary
The SprySOCKS backdoor's Windows variants represent a tactical evolution, blending Linux-derived C2 protocols with Windows-native stealth techniques. WIN_DRV's kernel driver obfuscates network artifacts, while WIN_PLUS abuses Print Spooler for persistence—a technique reminiscent of PrintNightmare exploits. The operational scope spans high-value government targets across Asia and Central America, suggesting geopolitical espionage objectives. The potential UEFI bootkit linkage (CVE-2023-24932) indicates advanced persistence mechanisms, though evidence remains circumstantial. Defenders should prioritize kernel driver whitelisting, Print Spooler hardening, and boot manager patching. Network monitoring for WebSocket-based C2 traffic—often overlooked in favor of HTTP/S—is critical given the backdoor's multi-protocol flexibility.
Action Items
- Patch CVE-2023-24932 and monitor for UEFI bootkit indicators.
- Restrict Print Spooler service permissions and audit print processor DLLs.
- Deploy kernel driver signature enforcement and monitor unsigned driver loads.
Original Article Brief Intro
The Hacker News · 2026-06-16 · Incidents: China's Earth Lusca group deploys stealthy Windows variants of SprySOCKS backdoor, targeting governments with kernel-level evasion and UEFI bootkit capabilities.
Related Terms and Notes
CVE IDs
- CVE-2023-24932 — Windows Boot Manager flaw allowing Secure Boot bypass, exploited by BlackLotus UEFI bootkit.
Malware Families
- Backdoor
- SprySOCKS — Modular backdoor derived from Trochilus RAT, supporting Linux and Windows with multi-protocol C2 channels.
Context Notes
- APT
- China
- Earth Lusca
- Kernel
- Kernel driver
- Print Spooler
- SprySOCKS
- UEFI
- UEFI bootkit