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The version containing the malicious payload (5.33) was being distributed between these dates. In reviewing the Version History page on the CCleaner download site, it appears that the affected version (5.33) was released on August 15, 2017. We confirmed that this malicious version of CCleaner was being hosted directly on CCleaner’s download server as recently as September 11, 2017. During the installation of CCleaner 5.33, the 32-bit CCleaner binary that was included also contained a malicious payload that featured a Domain Generation Algorithm (DGA) as well as hardcoded Command and Control (C2) functionality. We identified that even though the downloaded installation executable was signed using a valid digital signature issued to Piriform, CCleaner was not the only application that came with the download.

Talos began initial analysis to determine what was causing this technology to flag CCleaner. Upon closer inspection, the executable in question was the installer for CCleaner v5.33, which was being delivered to endpoints by the legitimate CCleaner download servers. On Septemwhile conducting customer beta testing of our new exploit detection technology, Cisco Talos identified a specific executable which was triggering our advanced malware protection systems.

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The company is urging users to upgrade to version 5.34 or higher (which it says is available for download here). The affected versions of the software are CCleaner and CCleaner Cloud.

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Some programs available for free on the internet might contain spyware, adware, or viruses.The security team at Cisco Talos discovered that download servers used by CCleaners had been compromised to distribute malware inside CCleaner. Microsoft does not support the use of registry cleaners. Registry cleaners also eliminate “corrupted” and “damaged” entries.

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Your registry is full of junk that is “ clogging” it and slowing down your PC. Registry cleaners fix “registry errors” that can cause system crashes and even blue-screens. Is it safe to defrag Windows 10 Registry? Registry defragmentation is safe provided you use a reliable and professional third-party tool to do it. Is registry Defrag safe?Īs we’ve already mentioned above, it can help optimize the way your system works and significantly improve your computer’s speed and overall performance. The company develops cleaning and optimisation tools for Microsoft Windows, macOS and Android operating systems, including CCleaner, CCleaner Browser, Defraggler, Recuva and Speccy. Piriform Ltd is a British software company based in London, owned since 2017 by Avast. In addition to being installed on more than 2 million systems, the CCleaner malware is dangerous because it can place a backdoor on infected systems that appears legitimate because it is signed with one of Piriform’s own digital certificates. Sadly, many people have erroneously thought of it as malware after being the subject of two cyber attacks since 2017. Piriform originally developed it, and Avast now controls it. No, CCleaner is a legitimate app for Windows, macOS, and Android. … It’s one of those free pc cleaner tools that just works when it comes to removing temporary files. 8 Does Windows 10 need registry cleaner?ĬCleaner has been used by IT professionals and users alike for cleaning up temporary files and the Windows registry.2 Is CCleaner registry cleaner Safe 2021?.1 Should i use ccleaner registry cleaner?.

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