Hans Christian on "[Malware?] Can't remove "reg.ru" malware"

Hi!

I manage this domains:

1. http://desahogada.com (malware affected)
2. http://foreheadcomedy.com

Both domains have the same theme and same plugins and are running in a shared hosting plan (Hostgator). But the first is affected by a malware that shows content from "reg.ru".

I've tried to fix the problem of the first domain doing the following:

• Deactivating all plugins
• Deactivating the theme (it works!)
• Replacing the theme from the 2nd domain to the 1st domain
• Cleaning the cache
• Searched the word "reg.ru" in the database and hosting files (nothing found)
• Installed and run this plugin with a complete scan

But is still showing the malware message :-( The only thing that "fix" the problem is selecting another theme. But I've copied and pasted the theme from "foreheadcomedy.com" (with no problems) and, when I replace on "desahogada.com", it continues showing the malware message.

I don't know what else can I do :S

Can someone help me?

Thank you so much!