Troj/RusDr-F is a Trojan for the Windows platform.
When Troj/RusDr-F is installed it creates the file <System>\lzx32.sys. This file is detected as Troj/RKRustok-J.
The following registry entry is set:
HKLM\SYSTEM\CurrentControlSet\Services\pe386
ImagePath
\??\<System>\lzx32.sys