How to identify that you're running under a VM?

Question

Is there a way to identify, from within a VM, that your code is running inside a VM?

I guess there are more or less easy ways to identify specific VM systems, especi

Answer 1

TrapKIT provides ScoopyNG, a tool for VMware identification -- it attempts to work around evasion techniques, but doesn't necessarily target any virtualization software other than VMware. Both source and binaries are available.