You should contact one.com and german police and file a report. One.com could probably disable the domain outright if they see it is involved in theft.
Also, contact mozilla and google and report the site as malicious. Not sure if they can block scam sites, but they sure can block sites carrying malware.
The gentleman running the site, does he have any previous history in the community, any rep?
Very sorry for anyone that lost money, but please be careful with all new services!