247 techie guys seem to have software to detect VMs. Is there any way around this? Stalling before the connection will only buy me so much time 
This is a pretty decent start…
https://www.youtube.com/watch?v=mbYh8HeAeWw&feature=youtu.be&a=
I also like to replace task manager with process explorer. A lot of people like to put in a fake msinfo32 https://scambait.club/upscambaittools/upmsinfo32/ and also on that same site you can find some other fake utilities.
Here are some things I have been busted on in the past:
Windows not activated
Not having enough documents or programs on the PC
Leaving the installation iso in the virtual dvd drive
Too silly of a picture for the background
Not having any history in event viewer (because it was a new VM)