Couloader.exe -

They check if they are running in a "sandbox" or virtual machine used by researchers and will shut down to avoid detection.

They can "hollow out" a legitimate Windows process (like explorer.exe ) and hide their malicious code inside it. CouLoader.exe

If you suspect an infection, do not try to delete the file manually, as it may have multiple copies or "watchdog" processes that will just reinstall it. They check if they are running in a