CCleaner malware was designed by hackers to steal sensitive data from unsuspecting users.CCleaner malware is a malicious program disguised as legitimate software called CCleaner.Microsoft cannot guarantee that these problems can be solved without a reinstallation of the Operating System as the extent of the changes made by registry cleaning utilities varies from application to application.” These issues might require users to reinstall the operating system due to instability. However, serious issues can occur when you modify the registry incorrectly using these types of utilities. Microsoft stated that “Some products such as registry cleaning utilities suggest that the registry needs regular maintenance or cleaning. This ban was due to Microsoft's general stance that Registry cleaners and system optimizers can do more harm than good on Windows 10 systems. In 2019, Microsoft temporarily banned CCleaner on the Microsoft Community forums that caused links to the program to be censored when posted. A scan with the free version of Malwarebytes should enable you to get rid of any PUPs. It is possible that CCleaner may have tricked you into installing a PUP (potentially unwanted program) when you installed CCleaner. In September 2017, researchers discovered that CCleaner was compromised by hackers who inserted a backdoor into the software, enabling remote access of infected machines. But Avast has done some questionable things since the acquisition and that reputation has suffered. CCleaner can do that, so Microsoft does not want you to get the idea that you can use it with impunity or that they endorse it in any way.īefore the acquisition of CCleaner’s maker Piriform by Avast in 2017, CCleaner did have a good reputation. Microsoft strongly advises against allowing any program to mess with your registry. Microsoft is now detecting the popular CCleaner Windows optimization and Registry cleaner program as a potentially unwanted application (PUA) in Microsoft Defender.

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