cpuid-js

cpuid

Execute any x86 cpuid call. You pass two arguments: eax and ecx register values and get back a response of 4 numbers in an array, the response returned as an array [eax, ebx, edx, ecx].

Example, when you execute 0, 0 call Intel returns GenuineIntel string in last three registers:

var cpuid = require('cpuid');
var temp = cpuid(0, 0);
console.log(temp); // [ 13, 1970169159, 1231384169, 1818588270 ]

Now let's create a string out of that:

var str = '';
for(var i = 1; i < temp.length; i++) {
    var reg = temp[i];
    str += String.fromCharCode(reg & 0xFF);
    str += String.fromCharCode((reg >> 8) & 0xFF);
    str += String.fromCharCode((reg >> 16) & 0xFF);
    str += String.fromCharCode((reg >> 24) & 0xFF);
}
console.log(str); // GenuineIntel

If you run under some virtual machine, those usually use 0x40000000 address to return their name:

temp = cpuid(0x40000000, 0);
var str = '';
for(var i = 0; i < temp.length; i++) {
    var reg = temp[i];
    str += String.fromCharCode(reg & 0xFF);
    str += String.fromCharCode((reg >> 8) & 0xFF);
    str += String.fromCharCode((reg >> 16) & 0xFF);
    str += String.fromCharCode((reg >> 24) & 0xFF);
}
console.log(str); // @VBoxVBoxVBox