Hi Kaumell,
I see that some rapid release definitions were created today to detect new variants of this malware:
Trojan.Clampi:
* Initial Rapid Release version January 18, 2008 revision 040
* Latest Rapid Release version July 10, 2009 revision 033
* Initial Daily Certified version January 17, 2008 revision 033
* Latest Daily Certified version July 10, 2009 revision 032
* Initial Weekly Certified release date January 23, 2008
Apply them and scan again your systems.
If you have some samples of this malware, you should submit them to our Security Response.
Regards,