The malware collects the following information about the infected system: In a press statement the company estimates that 2.27 million people used the affected software. The modified version, 5.33, is made available from August 15 until September 12 when version 5.34 was released. From the statistics brought out by Piriform, CCleaner has been downloaded 2 billion times in total, 5 million times every week. It is difficult to say at this moment how many users might have been affected, but the numbers could be huge. They are also investigating how the files coming from their servers were modified before being released to the public. Piriform is aware of the situation and is acting to prevent further damage. The incident was discovered and reported by Talos. In case you are wondering why they were on those servers, Avast acquired Piriform, the original publishers of CCleaner, a few months ago. Threat actors have managed to change the files that were being delivered by Avast servers hosting CCleaner updates. ![]() In a supply chain attack that may be unprecedented in the number of downloads, servers hosting CCleaner, a popular tool for cleaning up the PC, has been delivering a version of the said software with malware. The trojan itself reportedly only ran on Windows 32 bit systems, but the values above were created on 64 bit systems as well. Malwarebytes will detect the presence of those values and flag them as These values are not created by any clean versions of CCleaner, just by the infected ones. HKEY_LOCAL_MACHINE\SOFTWARE\Piriform\Agomo Users that are unsure whether they were affected by this and whether their data may have been sent to the C2 server can check for the presence of the following values under the registry key: One point we should take note of is that the breach preceded the take-over of Piriform by Avast. In summary, it should be said that CCleaner is designed for a wide range of users, it is made in an intuitive, stylish graphical interface and will allow you to give your computer a "second wind" without additional financial injections into the hardware configuration.Avast posted a clarification explaining what happened and giving a timeline of the events. In addition to cleaning and removing garbage, CCleaner has a number of additional tools that will be useful in configuring and optimizing your computer: In general, cleaning the registry and various garbage on the PC allows you to get additional space on hard drives and the system itself starts faster and becomes more responsive. At the same time, before deleting, the program suggests making a backup copy of the registry in case something goes wrong after cleaning or you just don't like it. So, CCleaner will find missing DLLs, incorrect file extensions, ActiveX errors in the registry, organize the Start menu, work through OS services, compare application paths, and much more. The registry monitoring tool is highlighted in a separate section: CCleaner checks each entry in the registry for its compliance with applications and services and if there are no links, it offers to delete broken or empty entries. In addition, this utility perfectly copes with removing garbage left after various kinds of multimedia applications (AIMP, Adobe Flash Player, VLC, etc.), Microsoft products (Office, OneDrive, etc.), mail programs, chats and uploaders (the Bat, Skype, uTorrent), archivers (WinRAR, 7-zip) and many others. It supports working with all popular browsers (Internet Explorer, Firefox, Google Chrome, Opera, Safari), where CCleaner will clean temporary files, browsing and download history, cookies, autofill registration forms, etc. ![]() Thanks to this program, the computer starts working faster and more stable and the performance of your machine's configuration is at the highest levels.ĬCleaner is able to deeply scan the system, finding and deleting old, unnecessary, unused and residual files after the operation of browsers and applications, as well as system updates. CCleaner is one of the best sets of tools for optimizing the operating system and cleaning it from all kinds of garbage.
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