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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. #Ccleaner malware issue software#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. (Piriform was bought by antivirus giant Avast in July.)Įdmund Brumaghin, Ross Gibb, Warren Mercer, Matthew Molyett, and Craig Williams at Talos report: I just checked, and the current version available from Piriform is version 5.34. 11.Īfter notifying Piriform, CCleaner was, ahem, cleaned up and version 5.34 appeared on Sept. 15 and which, according to Talos, was still the primary download on the official CCleaner page on Sept. Talos Intelligence, a division of Cisco, just published a damning account of malware that it found hiding in the installer for CCleaner 5.33, the version that was released on Aug. ![]() 15, a couple of nasty programs came along for the ride. #Ccleaner malware issue free#Want more consumer news? Visit our parent organization, Consumer Reports, for the latest on scams, recalls, and other consumer issues.If you installed the free version of CCleaner after Aug. If you want the super-technical details of how the malware worked and how this happened, read up at Cisco Talos, the research group that discovered the mostly-hidden malware, and Piriform’s news site. #Ccleaner malware issue Pc#Piriform and other experts believe that the end game here was probably to stage a future botnet attack on an outside target, turning your PC into part of a zombie army attacking… someone. The good news is that the malware was two-stage, and the malicious program hadn’t been installed on target computers… yet. Piriform pushed a malware-free version of the program to users, and you should make sure that you’ve updated your copy to the latest version if you’re a CCleaner user. Since the compromised program came with a genuine Norton signature and was on the company’s servers, the investigation shows that baddies probably gained access to the company’s systems either by posing as one of its developers or using a developer’s login to add the extra malware to the program. Yes, the malware installer piggybacked on the official versions of the app. #Ccleaner malware issue windows#It was part of the Windows and cloud versions of CCleaner, distributed as version. The compromised version of the program was distributed between Aug. It’s a free app with paid upgrades that unlock more features, and has been downloaded billions of times. It helps speed up systems, remove temporary files, and delete programs while actually fully removing them from one’s system. Clean up some crap, add some crapĬCleaner is a shortened and cleaned-up name the program was once better known as “Crap Cleaner.” The security software company Avast recently acquired the company that created it, Piriform. ![]() Yet for about a month, downloads of the popular program CCleaner came with a free bonus dose of malware, installed on millions of PCs around the world. When you download an app meant to clean your computer, you assume that it’s supposed to remove junk from your machine, not add more. ![]() 9.18.17 2:14 PM EDT By Laura Northrup crap ironic CCleaner version ccleaner crap cleaner malware botnets piriform avast ![]()
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