Yes, for about a month (from 25 August 2017 until yesterday) ccleaner 5.33 users had malware installed with the program without knowing, as yesterday (18 September 2017) Piriform posted:
http://www.piriform.com/news/blog/2017/9/18/security-notification-for-ccleaner-v5336162-and-ccleaner-cloud-v1073191-for-32-bit-windows-users
They say only Windows 32 bit users where affected but I saw the virus in the installer so ... kinda doubt that 64 bit Windows users where not affected too.
This is an unforgivable event specially when it comes from a reference company.
What to do?
- Important: do not enter ccleaner 5.33 or uninstall using windows uninstaller (it will call 5.33 to do the uninstall and it is not advisable). Do nothing!
- Download the new version 5.34 from Piriform, check it for malware (just in case) and install. It will remove the previous infected (?) 5.33 and install the new version 5.34
- Run a complete virus check of your system.
Please remember, as we say in our blog post about security:
"never install a program in your PC without previously scanning the installer for malware. Even if it comes from your usual software provider or a company you trust."
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