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# -*- coding: binary -*-
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###
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#
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# This module exposes a simple method to create an payload in an executable.
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#
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###
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module Msf
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module Exploit::EXE
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  def initialize(info = {})
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    super
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    # NOTE: Any new options here should also be dealt with in
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    # EncodedPayload#encoded_exe in lib/msf/core/encoded_payload.rb
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    register_advanced_options(
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      [
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        OptBool.new('EXE::EICAR',    [false, 'Generate an EICAR file instead of regular payload exe']),
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        OptPath.new('EXE::Custom',   [false, 'Use custom exe instead of automatically generating a payload exe']),
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        OptPath.new('EXE::Path',     [false, 'The directory in which to look for the executable template']),
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        OptPath.new('EXE::Template', [false, 'The executable template file name.']),
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        OptBool.new('EXE::Inject',   [false, 'Set to preserve the original EXE function']),
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        OptBool.new('EXE::OldMethod',[false, 'Set to use the substitution EXE generation method.']),
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        OptBool.new('EXE::FallBack', [false, 'Use the default template in case the specified one is missing']),
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        OptBool.new('MSI::EICAR',    [false, 'Generate an EICAR file instead of regular payload msi']),
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        OptPath.new('MSI::Custom',   [false, 'Use custom msi instead of automatically generating a payload msi']),
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        OptPath.new('MSI::Path',     [false, 'The directory in which to look for the msi template']),
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        OptPath.new('MSI::Template', [false, 'The msi template file name']),
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        OptBool.new('MSI::UAC',      [false, 'Create an MSI with a UAC prompt (elevation to SYSTEM if accepted)'])
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      ], self.class)
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  end
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  # Avoid stating the string directly, don't want to get caught by local
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  # antivirus!
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  def get_eicar_exe
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    obfus_eicar = ["x5o!p%@ap[4\\pzx54(p^)7cc)7}$eicar", "standard", "antivirus", "test", "file!$h+h*"]
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    obfus_eicar.join("-").upcase
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  end
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  def get_custom_exe(path = nil)
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    path ||= datastore['EXE::Custom']
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    print_status("Using custom payload #{path}, no handler will be created!")
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    datastore['DisablePayloadHandler'] = true
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    exe = nil
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    ::File.open(path,'rb') {|f| exe = f.read(f.stat.size)}
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    exe
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  end
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  # Returns an executable.
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  #
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  # @param opts [Hash]
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  # @option opts [String] :code Payload
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  # @option opts [Array] :arch Architecture
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  # @option opts [Msf::Module::PlatformList] :platform
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  # @raise [Msf::NoCompatiblePayloadError] When #genereate_payload_exe fails to generate a payload.
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  # @return [String]
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  def generate_payload_exe(opts = {})
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    return get_custom_exe unless datastore['EXE::Custom'].to_s.strip.empty?
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    return get_eicar_exe if datastore['EXE::EICAR']
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    exe_init_options(opts)
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    pl = opts[:code]
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    pl ||= payload.encoded
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    # Fall back to x86...
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    opts[:arch] = [ARCH_X86] if !opts[:arch] || opts[:arch].length < 1
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    # Ensure we have an array
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    opts[:arch] = [opts[:arch]] unless opts[:arch].kind_of? Array
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    # Transform the PlatformList
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    if opts[:platform].kind_of? Msf::Module::PlatformList
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      opts[:platform] = opts[:platform].platforms
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    end
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    exe = Msf::Util::EXE.to_executable(framework, opts[:arch], opts[:platform], pl, opts)
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    unless exe
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      raise Msf::NoCompatiblePayloadError, "Failed to generate an executable payload due to an invalid platform or arch."
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    end
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    exe_post_generation(opts)
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    exe
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  end
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  def generate_payload_exe_service(opts = {})
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    return get_custom_exe unless datastore['EXE::Custom'].to_s.strip.empty?
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    return get_eicar_exe if datastore['EXE::EICAR']
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    exe_init_options(opts)
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    # NOTE: Only Windows is supported here.
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    pl = opts[:code]
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    pl ||= payload.encoded
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    #Ensure opts[:arch] is an array
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    opts[:arch] = [opts[:arch]] unless opts[:arch].kind_of? Array
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    if opts[:arch] && opts[:arch].index(ARCH_X64)
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      exe = Msf::Util::EXE.to_win64pe_service(framework, pl, opts)
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    else
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      exe = Msf::Util::EXE.to_win32pe_service(framework, pl, opts)
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    end
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    exe_post_generation(opts)
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    exe
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  end
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  def generate_payload_dll(opts = {})
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    return get_custom_exe unless datastore['EXE::Custom'].to_s.strip.empty?
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    return get_eicar_exe if datastore['EXE::EICAR']
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    exe_init_options(opts)
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    plat = opts[:platform]
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    pl = opts[:code]
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    pl ||= payload.encoded
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    #Ensure opts[:arch] is an array
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    opts[:arch] = [opts[:arch]] unless opts[:arch].kind_of? Array
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    # NOTE: Only x86_64 linux is supported here.
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    if plat.index(Msf::Module::Platform::Linux)
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      if opts[:arch] && opts[:arch].index(ARCH_X64)
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        dll = Msf::Util::EXE.to_linux_x64_elf_dll(framework, pl,opts)
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      elsif opts[:arch] && opts[:arch].index(ARCH_AARCH64)
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        dll = Msf::Util::EXE.to_linux_aarch64_elf_dll(framework, pl,opts)
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      end
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    elsif plat.index(Msf::Module::Platform::Windows)
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      if opts[:arch] && opts[:arch].index(ARCH_X64)
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        dll = Msf::Util::EXE.to_win64pe_dll(framework, pl, opts)
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      else
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        dll = Msf::Util::EXE.to_win32pe_dll(framework, pl, opts)
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      end
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    end
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    exe_post_generation(opts)
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    dll
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  end
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  def generate_payload_dccw_gdiplus_dll(opts = {})
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    return get_custom_exe unless datastore['EXE::Custom'].to_s.strip.empty?
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    return get_eicar_exe if datastore['EXE::EICAR']
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    exe_init_options(opts)
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    plat = opts[:platform]
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    pl = opts[:code]
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    pl ||= payload.encoded
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    #Ensure opts[:arch] is an array
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    opts[:arch] = [opts[:arch]] unless opts[:arch].kind_of? Array
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    if opts[:arch] && opts[:arch].index(ARCH_X64)
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      dll = Msf::Util::EXE.to_win64pe_dccw_gdiplus_dll(framework, pl, opts)
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    else
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      dll = Msf::Util::EXE.to_win32pe_dccw_gdiplus_dll(framework, pl, opts)
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    end
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    exe_post_generation(opts)
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    dll
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  end
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  def generate_payload_msi(opts = {})
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    return get_custom_exe(datastore['MSI::Custom']) unless datastore['MSI::Custom'].to_s.strip.empty?
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    return get_eicar_exe if datastore['MSI::EICAR']
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    exe = generate_payload_exe(opts)
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    opts.merge! ({
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        :msi_template => datastore['MSI::Template'],
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        :msi_template_path => datastore['MSI::Path'],
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        :uac => datastore['MSI::UAC']
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    })
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    Msf::Util::EXE.to_exe_msi(framework, exe, opts)
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  end
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protected
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  def exe_init_options(opts)
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    opts.merge!(
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      {
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        :template_path => datastore['EXE::Path'],
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        :template => datastore['EXE::Template'],
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        :inject => datastore['EXE::Inject'],
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        :fallback => datastore['EXE::FallBack'],
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        :sub_method => datastore['EXE::OldMethod']
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      })
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    # NOTE: If code and platform/arch are supplied, we use those values and skip initialization.
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    #
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    # This part is kind of tricky so we need to explain the logic behind the following load order.
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    # First off, platform can be seen from different sources:
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    #
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    # 1. From the opts argument. For example: When you are using generate_payload_exe, and you want
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    #    to set a specific platform. This is the most explicit. So we check first.
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    #
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    # 2. From the metadata of a payload module. Normally, a payload module should include the platform
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    #    information, with the exception of some generic payloads. For example: generic/shell_reverse_tcp.
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    #    This is the most trusted source.
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    #
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    # 3. From the exploit module's target.
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    #
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    # 4. From the exploit module's metadata.
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    #
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    # Architecture shares the same load order.
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    unless opts[:code] && opts[:platform]
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      if self.respond_to?(:payload_instance) && payload_instance.platform.platforms != [Msf::Module::Platform]
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        opts[:platform] = payload_instance.platform
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      elsif self.respond_to? :target_platform
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        opts[:platform] = target_platform
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      elsif self.respond_to? :platform
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        opts[:platform] = platform
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      end
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    end
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    unless opts[:code] && opts[:arch]
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      if self.respond_to? :payload_instance
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        opts[:arch] = payload_instance.arch
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      elsif self.respond_to? :target_arch
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        opts[:arch] = target_arch
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      elsif self.respond_to? :arch
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        opts[:arch] = arch
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      end
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    end
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  end
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  def exe_post_generation(opts)
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    if opts[:fellback]
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      print_status("Warning: Falling back to default template: #{opts[:fellback]}")
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    end
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  end
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end
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end
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