remove official backdoor:
1、modify assets\libraries\PayPal\vendor\paypal\rest-api-sdk-php\lib.php
Lines 230-251 are removed
2、Delete all the contents of assets/libraries/google/vendor/rize/uri-template/src/Rize/UriTemplate/Node/node.php
3、modify assets/includes/functions_general.php
search
if (!is_writable("./sources/server.php")) {
@chmod("./sources/server.php", 0777);
}
removed it.
4、modify assets/includes/functions_three.php
search
require_once('./assets/libraries/google/vendor/rize/uri-template/src/Rize/UriTemplate/Node/Node.php');
removed it.
5、delete the file of sources/server.php
6、./sources/welcome.php line 7 remove it
done!