German Federal Trojan Suspected

The german hacker club CCC claims that they found a trojan malware used by german federal police (german source).
It seems that the software has many security issues and, even worse, has abilities which are illegal under german law.

The interesting question is now: Does it really originate from german authorities? Of course they deny that. And if so, how would one prove that? It seems that the trojan uses command servers outside of germany. At the moment it is unclear who operates these machines.

I do not expect that this will ever be resolved completely. It's way too embarrassing.

Update: The Bavarian Government accepted responsibility for the trojan. Antivirus vendors claim that it would be caught be heuristic malware detectors. Looks like there is an egg on someone's face.