Quick scan hangs

Hi all,

as the title says: NIS 2012 icon after reboot shows red because it didn't do a scan since long. I press to solve the issue and it starts a quick scan which hangs after about 7400 scanned elements and shows "scanning for hacktool.unreal.a".

I booted into safe mode and did a full scan, it didn't find anything at all. But the quick scan in normal mode ist still requested, and still hangs at that point.

What can I do?

M