I've used CCLeaner almost religiously for decades on all may computers. No observed problems, but I will be on the lookout.
"Crom is strong! If I die, I have to go before him, and he will ask me, 'What is the riddle of steel?' If I don't know it, he will cast me out of Valhalla and laugh at me."
Wow. Hacking anti-malware software to reconfigure it to distribute malware. Sneaky.
I do use CCleaner on occasion. Luckily, it appears that this issue only applies to folks who used version 5.33 from August 15, 2017 through September 12, 2017. I have not used CCleaner in probably 6 months or so.
I am also using Malwarebytes, so maybe that saved me.
"Crom is strong! If I die, I have to go before him, and he will ask me, 'What is the riddle of steel?' If I don't know it, he will cast me out of Valhalla and laugh at me."
Wow. I use Ccleaner only a handful of times a year, and I happened to use the exact version (5.33.6162) on 9/11 on two important machines, to free space on C drives. Fortunately they're 64 bit. I'm surprised 64 bit machines were apparently not impacted.
My registries look fine, no attempted connections to the mentioned IPs in our firewall, no file hash match.
Malwarebytes identified the CCleaner installer itself (in the trash bin), and a file in the Google Chrome cache on my two 64-machines, but no actual infection.