Don´t get that wrong, but that is very easy to say,because it is not BO2K. It is just an installer SFX it contains an cab Archive, that contains an instalation that will install Bo2K. It seems if you start the exe and continue the installation Avast will find the RAT. F-prot will report the exe as suspicious and Mcafee as an oriffice.sfx, because they want to avoid support questions like"Why don´t you identify this BO2k? The homepage where i downloaded this file, said it s BO2K, so it has to be BO2K and therefor your Product is bullsh*t!"
Detecting such files is easier than to explain again and again, that the bo2k_1.0.exe isn´t Maleware.