If you’re affected, Cisco Talos recommends using a backup to restore your PC to a state prior to August 15, 2017, which is when the hacked version was released. You’ll also want to perform an antivirus scan on your computer. Previous releases are also still available on the company’s website, but the infected version has been removed from the company’s servers. Personal users can download CCleaner 5.34 from Avast’s website if they haven’t already done so. 13, Cisco Talos found that the official download of the free versions of CCleaner 5.33 and CCleaner Cloud also contained “a malicious payload that featured a Domain Generation Algorithm as well as hardcoded Command and Control functionality.” What that means is that a hacker infiltrated Avast Piriform’s official build somewhere in the development process build to plant malware designed to steal users’ data. 21 with details about the malware targeting specific technology companies for industrial espionage. In an in-depth probe of the popular optimization and scrubbing software, Cisco Talos has discovered a malicious bit of code injected by hackers that could have affected more than 2 million users who downloaded the most recent update.Įditor’s note: This article was first published on September 18, 2017, but was updated on Sept. It seems that CCleaner, one of PCWorld’s recommendations for the best free software for new PCs, might not have been keeping your PC so clean after all. ^ "Avast urges devs to secure toolchains after hacked build box led to CCleaner disaster," JohnLeyden, The Register,.^ "CCleanup: A Vast Number of Machines at Risk"."Avast acquires Piriform, maker of popular system cleaning program CCleaner". ^ a b "Hackers compromised free CCleaner software, Avast's Piriform says".^ "A first look at CCleaner Cloud - gHacks Tech News".Archived from the original on 12 April 2016. ^ "Piriform Blog - CCleaner Cloud has Launched!".It supposedly makes websites and advertisers less able to show targeted ads, recommendations and price increases. ĬCleaner also develops a tool called Kamo, which feeds trackers fake information to help stop a ' digital fingerprint' (a unique fingerprint that can be used to identify and track people) from being created. The browser is only available for Microsoft Windows. CCleaner Browser blocks online advertisements, avoids tracking, has built-in security against malware, phishing, malicious downloads, and also avoids potentially unwanted elements like pop-ups or excessive browser cache. CCleaner Browser is included to optionally install in the CCleaner installer, but it can also be installed from its website. In addition, CCleaner can automatically update computer software and drivers.ĬCleaner has its own web browser called CCleaner Browser. It allows one to quickly access system restore points, and it can wipe clean the free space on individual drives to completely remove deleted files. It can search for duplicate files to help reduce drive storage space. It can analyse hard disks individually to determine which files are taking the most space. (A potential backup of regedit is available.) CCleaner's other tools include editing and uninstalling programs, editing the operating system's startup apps and editing browser plugins. It has a separate tab to clean the registry. CCleaner has the option to clean computer browser software including Microsoft Edge, Internet Explorer, Google Chrome, and Firefox as well as a computer system's temporary files. CCleaner ĬCleaner is a computer cleaning software featuring MacOS and Windows versions. Avast quickly fixed the vulnerability and required version 5.33 users to update immediately. The malware was in version 5.33 of CCleaner, prior to the acquisition by Avast. In September 2017, researchers discovered that CCleaner was compromised by hackers who inserted a backdoor into the software, enabling remote access to infected machines. In July 2017, Piriform Ltd was acquired by Avast. ĬCleaner was launched in 2004 by founders Guy Saner and Lindsey Whelan. The name Piriform means "shaped like a pear," possibly referring to the British slang " to go pear-shaped". On 22 September 2015, Piriform launched CCleaner Cloud, a tool to maintain computers remotely. The company develops cleaning and optimisation tools for Microsoft Windows, macOS and Android operating systems, including CCleaner, CCleaner Browser, Defraggler, Recuva and Speccy. Piriform Software Ltd is a British software company based in London, owned since 2017 by Avast which itself became part of NortonLifeLock (now Gen Digital) in 2022.
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