Created the Monday 11 March 2019. Updated 3 weeks ago.
The IN instruction is a type of machine code instruction that is used to read data from an input port. This instruction can only be executed in privileged mode, such as in kernel mode, and an attempt to execute it in user mode will generate an exception.
However, some virtual machine monitors, such as VMWare, use a special port called the VX port as an interface between the virtual machine monitor (VMM) and the virtual machine. If a malware executes the IN instruction in user mode on a VMWare virtual machine, it will not generate an exception, since the VX port allows the instruction to be executed without triggering an exception. This behavior can be used by the malware to detect the presence of a VMWare virtual machine.
The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.