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In a statement to BleepingComputer, Microsoft clarified that Microsoft Defender only flags the free version of CCleaner because it comes with "bundled offers." "Our potentially unwanted application protection aims to safeguard user productivity. 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. Some products such as registry cleaning utilities suggest that the registry needs regular maintenance or cleaning. A support page dedicated to registry cleaning utilities explains: While Microsoft isn't preventing Windows users to use CCleaner if they really want to, the company has been recommending users to avoid them for quite some time. To be clear, Microsoft Defender should only flag the free version of CCleaner if users have already enabled the protection against PUAs in Settings.
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"While the CCleaner installers do provide an option to opt out, some users can easily inadvertently install these bundled applications," the company explained.
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Microsoft has detailed four third-party software on its site that have been found bundled with certain installers for free and 14-day trial versions of CCleaner, including Google Chrome, Google Toolbar, Avast Free Antivirus, and AVG Antivirus Free.
The company has quietly updated its malware encyclopedia site to indicates that Microsoft Defender flags some CCleaner installers that bundle third-party products (via Bleeping Computer).
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We would be happy to update our list as new information becomes available.If you've recently tried to install the free version of CCleaner utility to clean and optimize your PC, you might have noticed that Microsoft Defender is now detecting it as a potentially unwanted application (PUA). If you notice that we have omitted a supply chain attack from our partial history, please let us know and, if possible, send corroborating evidence (links to public records, press coverage, social media posts, etc.) that we can use to verify your claim. Some of the OSS projects impacted include Amazon’s cloud development kit, Facebook’s Jest, Javascript, and Node.js. In an act of protest against corporations exploiting open source projects, Npm libraries “colors” and “faker” were sabotaged by their maintainer, Marak Squires. A Chronology of Software Supply Chain Attacksīelow is a list of known (documented, reported) attacks involving compromises of software supply chains.Ģ022 Global Several well-known OSS projects Others may use a more liberal definition of what is and is not a "supply chain" attack than we have and, thus, end up with a longer list of incidents. Finally, opinions on what constitutes a software supply chain attack can differ from expert to expert. Second, these attacks are ongoing, making any accounting of software supply chain attacks incomplete.
First: it is likely that there have been supply chain attacks that have not been made public. Here is a list of known software supply chain attacks, compiled from public records and reporting. In fact: software supply chain attacks have been with us for years - decades even - though they haven’t always demanded the kind of attention and response they are now receiving. Subsequent events, like the emergence of the Log4Shell vulnerability in the Log4j2 open source library, underscored that software supply chain risk is for real.īut if you are thinking that software supply chain threats and attacks are a new problem plaguing software companies and their customers, you are wrong. The widespread campaign of software supply chain attacks that has become known as the “SolarWinds attack” began in 2020, and unofficially elevated software supply chain security to the top echelon of cyber risks to both government and the private sector.