I won't get any more info Googling for that than you did but I can answer a couple of things. I use ewido and after the 14 days, you lose the Process Guard, the auto updating and the premium support but you can still get updates manually and use the scanner. CastleCops has a ewido support forum that might be able to help, including a section for false positives which this MIGHT be. I was involved in a thread a while back at Wilders when some of us had an updating problem and the ewido people came themselves quickly and told us how to fix the problem. Here is the CastleCops link.
http://castlecops.com/f196-Ewido.html
also listed as Trojan.Shutdowner.C
I have a security suite installed (EWIDO) that has found this 'high' alert inside an .exe file that I've had for years and used before called goodnite.exe which is an immediate shutdown program of your system.
I've never received a warning from any other virus or spyware checker about it before, and although a google search on those names turned up a response at the EWIDO site (the only other site mentioning this security alert is virusbuster), going to the site linked at the google page, takes me repeatedly to the home page of EWIDO and no further to get information about it. Virusbuster only lists it in their database but no information about it either.
I have the 14-day trial version of EWIDO and am considering purchasing it, but am wondering if the on-line support or virus/trojan search is disabled unless/until I purchase the product. I've been to both my Etrust site (ca.com) and also to Trend, with NO results after doing a search for that alerted name in either form.
Does anybody have any information about this name? Right now I have the EWIDO program ignoring it rather than removing the goodnite.exe file for now since it's never posed a threat before.
TONI

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic