The last week I translated a document named "
Wie man unter Windows NT unsichtbar wird" from English to German.
The document is pretty old but the information in it is still very readable. It describes techniques to hide objects, files, registry keys/values, services, drivers, handles, allocated memory and ports on Windoze NT.
The original version in English can be found here:
http://hxdef.net.ru/knowhow/hidingen.txt