My website hacked by someone and he added some propeller ads popup code on my site. I was not able to find that script, I tried removing all the plugins from the site and turn to basic WP theme also. how is it possible? when i load the site, i can see a small script running on load, and i can see the publisher id of that hacker. i used some plugins to find the script running on site when site loaded. but there is nothing in WordPress. any idea where he added the script?