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, "-6336251-0. Talos published very convincing logs of attempts by infected machines to hook into the bot Command sites. BCB:21:Support message - Sage Q&A Live:ECB. Portable apps, such as Piriforms CCleaner, can run from external USB. If you install CCleaner 5.33, your machine hooks into a bot network. If the issue persists, install the update directly from the installation files. You dont always have to install an application to perform important computer tasks. 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. Note: to buy the full version of the new CCleaner for Mac, you’ll also need to navigate an online cart process and activate the paid product with a valid license key. 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. Find out more about the new CCleaner for Mac. 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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