Thanks for the feedback :-) As I mentioned at the end of the post, there are indeed malwares that detect being run in a virtual environment and who change their behavior (e.g. do nothing). I'm not an expert at all on the topic, but I was recommended https://byte-atlas.blogspot.com/2017/02/hardening-vbox-win7x... on the subject. I'm interested if somebody has additional resources to provide.