Clean Malware From Moodle Site

I run an educational-training portal on Moodle and the front page vanished. All that loads now is a plain “Index of /” directory listing with a few basic links—no courses, no theme, nothing. A malware bot is the likely culprit and I need the entire installation scrubbed, restored, and locked down... (Budget: $30 - $250 USD, Jobs: cPanel, Database Management, Moodle, MySQL, PHP, Web Development, Web Hosting, Web Security)