Urgent Fix: Malware Removal & WP-Admin Access

My WordPress site seems to have malware, preventing me from accessing wp-admin. I'm encountering a 404 error when I try to log in, and I'm not receiving any error messages beyond that. As I don't have the technical know-how to troubleshoot this, I'm in need of an experienced web developer with a strong background in WordPress and malware removal.

Skills and Experience Required:
- Extensive experience with WordPress
- Proven track record in malware removal
- Strong troubleshooting skills
- Excellent communication skills