Now is 2006, it's being long time i didnt take note any update from Backdoor/RAT world. Is that in 2006 still have a backdoor that can be running on latest Windows variant? Hohoho... is that anyone in here still using BO/Sub7/etc? :p

My "favorite" is BackOrofice 2K. While it actually is a RAT, it is extremely (in)famous; you may not even know you have it until it's too late.

It is EXTREMELY sneaky.

It all depends on how stealthy or what you actually want to accomplish. If you don't want the silly toys like opening CD/DVD trays or flipping a screen upside down (although very funny to do this to a friend or coworker), then KISS - Keep It Simple Stupid.

Something like netcat or the newer and stealthier cryptcat are still great for back doors and can be installed with SQL injection.

As for trojans, anything can be a trojan. You just simply have to trick the user into installing it while thinking it's something they want. So modern wrappers are good to attach backdoors to legit programs. Hell, you could make the logical argument that phishing is a form of trojan. Something to trick the victim into lowering their defenses long enough to let the bad guys in.

Just wanted to add to the conversation,
Don