This is a small guide and FAQ on the malware installed alongside CCleaner 5.33.6162. For a full recap of what happened, you can read our complete CCleaner coverage.
An unknown threat group compromised the CCleaner infrastructure.
The attacker added malware to the CCleaner 5.33.6162 and CCleaner Cloud 1.07.3191 installers, but the malware only executed on 32-bit systems and when run by a user with admin rights.
The files were available for download between August 15 and September 12.