Now seems this was a targeted attack, so most users aren't of great interest to the malware controllers. Bad news appears to be that it affected 64-bit PCs as well.
Latest from Avast (new owners of CCleaner):
For consumers, we stand by the recommendation to upgrade CCleaner to the latest version (now 5.35, after we have revoked the signing certificate used to sign the impacted version 5.33) and use a quality antivirus product, such as Avast Antivirus. For corporate users, the decision may be different and will likely depend on corporate IT policies. At this stage, we cannot state that the corporate machines could not be compromised, even though the attack was highly targeted.
https://blog.avast.com/progress-on-ccleaner-investigation