Version 5.33 that was available for download between August 15 and September 12 was modified to include the Floxif malware. Cisco Talos experts spotted the trojanized CCleaner app last week while performing beta testing of a new exploit detection solution. Avast owns Piriform that developed the CCleaners solution, the Antivirus solution firm bought it in July, a month before the tainted version was released. On September 13, Piriform released a new version of the software that does not contain the malware.”]
Source: https://securityaffairs.co/wordpress/63148/breaking-news/ccleaner-supply-chain-malware.html