1. A non-transitory machine-readable medium on which are stored instructions, comprising instructions that when executed cause a machine to: identify a request to execute an executable file; disable simulation of a virtual environment during execution of the executable file responsive to a determination that the executable file is not protected or packed or a determination that a packer or protector used to pack or protect the executable file is whitelisted; enable simulation of the virtual environment during execution of the executable file responsive to a determination that the executable file is protected or packed and a determination that a packer or protector used to pack or protect the executable file is not whitelisted; and execute the executable file, wherein simulation of the virtual environment causes execution of the executable file to appear to be executing in the virtual environment even though elements of the simulated virtual environment are not present on the machine.