Troj/Rustok-B is a Trojan for the Windows platform.
When Troj/Rustok-B is installed it creates the file <System>\xpdx.sys.
The file xpdx.sys is detected as Mal/RKRustok-A.
The file xpdx.sys is registered as a new system driver service named "xpdx", with a display name of "xpdx system driver". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\xpdx