I had the same thing happen to me just this morning. Same message popped up with my AV, then 3 or 4 more. The files infected were all updates for CCleaner versions 131, 132, 133 and 134 plus the file mentioned in the above post.
I am now running version 130 and all is fine. I have a second computer running version 136 and no sign of virus on that one, but I also did not update that one as often and I believe I went from version 130 to 136 on the second computer.
I also am very on top of virus scans, spyware scans etc.
Someone suggested that this was a false positive, however right after using CCleaner and apparently launching the virus, my computer became very, very sluggish. Programs wouldn't open, etc.
