sandfly-kernel-module-decloak
2025-09-28 • Sandfly Security •
https://github.com/sandflysecurity/sandfly-kernel-module-decloak
Sandfly Security released a detection script for a Linux Loadable Kernel Module rootkit described in a Phrack data dump attributed in the source to a threat actor purportedly from North Korea. The tool checks for hidden kernel modules that disappear from /proc/modules while leaving module-name traces in /proc/vmallocinfo, a technique relevant to the leaked rootkit framework and similar hiding methods used by variants such as Reptile. An example detection shows a hidden module named vmwfxs and recommends corroborating kernel taint evidence with dmesg, while noting that ring-buffer rollover can remove older taint messages. The script is intended for manual host investigation and highlights why defenders need multiple Linux rootkit hunting techniques, because not all LKM rootkits leave the same artifacts.