Similar thing happened to me this morning - but not during a download.
Sophos just reported this virus in c:\programfiles\ccleaner\uninst.exe troj/zlob-VU
I am running ccleaner 1.34.407 (downloaded a while back)
Sophos 6.0.5 last updated this morning.
I've never had A/V problems with the ccleaner before so I assume it is the latest Sophos update that has triggered a false positive.