Need Malware Security Expert

I have a reseller hosting site where my clients' sites keep getting infected with D93065 malware. I clean the files, delete anything I don't recognize, change all passwords and it happens again a few hours or days later. I scanned my computer and removed all viruses, trojans, etc and changed all passwords. Nothing helps. Other sites on different hosts that I work on are also having this issue. I keep scanning my computer, and it's clean. All of the hosting companies tell me "oh well, find the problem and fix it yourself." I need someone that knows about D93065 malware or similar to find why this keeps happening. Will pay. Experts only, thanks guys! PM me.