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It's an Bitcoin wallet QT Core.. Clicked bitcoin client to run it and CyberCapture appears and told me that this file is sent to labs to check.. Should i concern or should i change wallet immediately?
First I'm an avast user and not a member of the Avast Team, so I can't speak for them.
Nor do I use B.i.t.c.o.i.n and have no other knowledge about it - other the many B.i.t.c.o.i.n spammers trying to post in the Avast Support Forums. This doesn't give me a warm feeling about B.i.t.c.o.i.n if there is suck a huge spamming effort.
That aside - As I mentioned, I believe it should be a copy that gets sent rather the actual file, so it really should be in one of the two locations I mentioned. Have you physically checked those locations ?
I don't know how difficult/complex (or the risk involved) changing the B.i.t.c.o.i.n wallet is. That said, I would always air on the side of caution and safety.