For me prune scene wont really deal with the virus, it just erasing it from the scene but not from the system, so it will come back again (we did try the manual option and the virus gets created again on some super hidden carpet ) Did you tell autodesk of this? (i know autodesk is the slowest company to adress this type of issues (the "virus" took like a year to be acknowledge, ALSO i havent heard a thing about the virus real intentions, I dont think its just made to mess up 3dsmax scenes, why any one bother to do that, i think its more like cryptos or something like that, just think on all the big farms or workstations that have 3dsmax...