Drosera report on WINDOWSXP:
Date: 16 July 2010 - 06H52M01

DESCRIPTION
Another solution for detecting hidden processes is to brute-force
PID with the OpenProcess() API to check if a specific process is
active (or not). If OpenProcess() returns a non null handle, then it
means that there is an active process.

DESCRIPTION
This one looks at every ETHREAD structure from an
undocumented schedule table, and finds its associated EPROCESS structure.
This allows to detect advanced rootkit features like "FUTo enhanced" ones.

DESCRIPTION
This module checks differences between the driver lists retrieved using
both Windows API (which is easy to hide from) and Kernel techniques. To do
so, this module uses an advanced technique which looks at every OBJECT
structure or type “Driver”.