I was also recently hacked. I suspected something was up when the control panel prompted me that the index had changed, though I’ve been doing a lot of dev and couldn’t remember if I had changed it for some reason or not. Then I decided to update my system to 2.4 and stupidly accepted the changes to index.php. I noticed that all of my pages were running very slow and suspected it was just a problem with my host ... then I got a time out error referencing some script that is definitely hackerish: [removed][removed]
I’ve checked all of the files that were mentioned above to locate where this was inserted but I can’t find it. Are there any other places to look? It seems to be adding itself automatically to every page—both control panel and live webpages— just above the closing body tags.