I don't think you need to worry now. To be safe, update to the latest release.
From:
https://www.askwoody.com/
Quote:
CCleaner back door / botnet infection updates
Bottom line: If you installed CCleaner any time after Aug. 15, you need to install the latest version.
Avast bought Piriform (and CCleaner) in July. The malware was inserted into the installer in August. The botnet Command center was taken down in September.
Oy. Don’t use registry cleaners, OK?
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Earlier I read if you updated to a later - the most recent version you'd be in the clear.
Furthermore the payload had been neutered before it was released in the bad version. It never phoned home and 'home' for it doesn't exist. We got lucky.
I updated past the infected version last week and users that do will be OK for sure. It is harmless now and from what I read earlier it always was. I hate it when something you trust does something like this though.