October 2018
Beginner to intermediate
436 pages
9h 36m
English
Content preview from Mastering Reverse Engineering
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CPUID results
CPUID is an x86 instruction that returns information about the processor it is running under. Before running the instruction, the type of information, called a leaf, is required and stored in register EAX. Depending on the leaf, it returns values in registers EAX, EBX, ECX, and EDX. Every bit stored in the registers may tells if a certain CPU feature is available or not. Details about the returned CPU information can be found at https://en.wikipedia.org/wiki/CPUID.
One of then pieces of CPUID returned information is a flag that tells whether the system is running on a hypervisor. Hypervisor is a CPU feature that supports running VM guests. For anti-VM, if this flag were enabled, it would mean that the process is in a VM guest. ...
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