Once you break at the VM dispatcher, look at the register holding the bytecode pointer (e.g., RDI or RSI in VMP 3.x). Dump the memory region. You will see a stream of bytes. Example bytecode fragment: B8 10 00 00 00 9C 45 20 ... This is your new assembly language.
Below is a structured blog-style overview of how researchers approach this target. The Architecture: A Custom CPU in Software vmprotect reverse engineering
clean_instructions = [] for ins in trace: if ins.address not in handlers: # This instruction is not a VM handler. # It might be the original code emulated, or a VM exit. clean_instructions.append(ins) Once you break at the VM dispatcher, look
He switched tactics. Instead of reading the bytecode, he had to reverse the interpreter . He began classifying the Handlers. Example bytecode fragment: B8 10 00 00 00 9C 45 20
But wait—the program generated k based on the MachineGUID. If he could just replicate the generation process with a spoofed GUID, he could create a valid session key.