Sonya said:
There is a techtarget article, apparently researchers discovered that the August update had been compromised. I had that update on my laptop (not the desktop) and after reading the article opened up ccleaner and sure enough I got a message about a critical update, installed the September update ran MBAM and it did find the CCleaner trojan.
You do realize that Avast just purchased Piriform. The app was clean all the way up until suddenly Avast is causing a false positive to try and push everyone to purchase their product and in turn are destroying the Piriform brand.