The affected versions of CCleaner and CCleaner Cloud were released on August 15 and August 24, respectively.Īvast in its report has apologized for the "security incident." The security firm Cisco Talos informed Avast of its findings on September 13, which then proceeded to release an updated version of its utility. This popularity, however, also makes the utility a hotbed for malware. Last year the security firm also boasted that CCleaner has a growth rate of 5 million additional users per week. The "crap cleaner" has over 2 billion downloads to its name, according to the AV firm Avast itself. ![]() Over 2 million users are estimated to have been infected by this modified version of software utility.įTC Responds to Avast Selling Browsing Data – Says It Won’t “Hesitate to Take Appropriate Action as Necessary” When AV firms can't protect their own software. ![]() "For a period of time, the legitimate signed version of CCleaner 5.33 being distributed by Avast also contained a multi-stage malware payload that rode on top of the installation of CCleaner," the report by the Talos team said. The problem was first spotted and reported by Cisco Talos that discovered that download servers used by the antivirus firm Avast - that now owns CCleaner - were compromised to distribute malware inside CCleaner. The malicious utility was then distributed to millions of CCleaner's 2 billion users. Hackers successfully managed to breach security of CCleaner and injected malware into the app. Someone hid malware in CCleaner, possibly to recruit infected machines for a botnet | Image: depositphotosĬCleaner, a popular optimization utility for Windows and Android, has apparently been infecting "millions of users" with a backdoor.
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