Check your version!
"A version of CCleaner downloaded in August included remote administration tools that tried to connect to several unregistered web pages, presumably to download additional unauthorized programs, security researchers at Cisco’s Talos unit said.
Talos researcher Craig Williams said it was a sophisticated attack because it penetrated an established and trusted supplier in a manner similar to June’s “NotPetya” attack on companies that downloaded infected Ukrainian accounting software." - Cisco
"Piriform has confirmed that two programs released in August were compromised. It advised users of CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 to download new versions. A spokeswoman said that 2.27 million users had downloaded the August version of CCleaner while only 5,000 users had installed the compromised version of CCleaner Cloud.
Piriform said that Avast, its new parent company, had uncovered the attacks on Sept. 12. A new, uncompromised version of CCleaner was released the same day and a clean version of CCleaner Cloud was released on Sept. 15, it said....CCleaner does not update automatically, so each person who has installed the problematic version will need to delete it and install a fresh version, he said." Piriform
So, if you have the versions of CCleaner mentioned above on your machine, uninstall them and get the bewest version.
Thanks for the heads up, I.D.