![]() The malware, which was distributed through the update server for the Windows cleanup utility CCleaner, was apparently inserted by an attacker who compromised the software "supply chain" of Piriform, which was acquired by Avast in July. There have been more than 2 billion downloads of CCleaner worldwide, so the potential impact of the malware is huge. The primary infection Command server has been taken offline, as has a secondary server.Īccording to Talos, the Virus Total regimen for checking antivirus products against a submitted sample turned up only one AV package that correctly identifies this infection, " software package update for a Windows utility product distributed by antivirus vendor Avast has been spreading an unsavory surprise: a malware package that could allow affected computers to be remotely accessed or controlled with what appears to be a legitimate signing certificate. Talos published very convincing logs of attempts by infected machines to hook into the bot Command sites. If you install CCleaner 5.33, your machine hooks into a bot network. The details are complex, but the upshot is clear: Somebody managed to tack a malware package onto the legitimate distribution file for CCleaner. If you installed CCleaner 5.33, you're infected 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. …Įven 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. ![]() 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. Talos recently observed a case where the download servers used by software vendor to distribute a legitimate software package were leveraged to deliver malware to unsuspecting victims. Edmund Brumaghin, Ross Gibb, Warren Mercer, Matthew Molyett, and Craig Williams at Talos report: ![]()
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