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While such information isn't sensitive (i.e. In other words, to the best of our knowledge, we were able to disarm the threat before it was able to do any harm.' 'Users of CCleaner Cloud version have received an automatic update. 'The threat has now been resolved in the sense that the rogue server is down, other potential servers are out of the control of the attacker, and we're moving all existing CCleaner v users to the latest version ,' Piriform's vice president of products, Paul Yung, said in a post (Opens in a new window).

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Piriform revealed that the malware collected system information-including lists of installed software and Windows updates, MAC addresses of network adapters, PC names and information from the Windows registry key all of which was sent to a remote server. 15 it notified Piriform-CCleaner's UK-based developer, which was acquired by Avast (Opens in a new window) in July-on Sept.

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The regular and cloud-based versions of CCleaner, which has been downloaded over 2 billion time worldwide as of November 2016 and adds about 5 million new users a week, have since been patched and the US-based server to which the malicious code sent system information has been shut down.Īccording to security researchers at Cisco Talos, who spotted the code (Opens in a new window), ' the executable in question was the installer for CCleaner v5.33, which was being delivered to endpoints by the legitimate CCleaner download servers.'Ĭisco Talos says the malicious version of CCleaner was released on Aug. Two versions of popular cleanup tool CCleaner for 32-bit Windows machines contained well-hidden malware.

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Only the cloud version could be updated automatically to remove the bad code. A new, uncompromised version of CCleaner was released the same day and a clean version of CCleaner Cloud was released on Sept. Piriform said that Avast, its new parent company, had uncovered the attacks on Sept. A spokeswoman said that 2.27 million users had downloaded the August version of CCleaner while only 5,000 users had installed the compromised version of CCleaner Cloud. It advised users of CCleaner v and CCleaner Cloud v to download new versions. In a blog post, Piriform confirmed that two programs released in August were compromised. “There is nothing a user could have noticed,” Williams said, noting that the optimization software had a proper digital certificate, which means that other computers automatically trust the program. Talos researcher Craig Williams said it was a sophisticated attack because it penetrated an established and trusted supplier in a manner similar to June’s “NotPetya” attack on companies that downloaded infected Ukrainian accounting software.

At the time of the acquisition, the company said 130 million people used CCleaner.Ī version of CCleaner downloaded in August and September included remote administration tools that tried to connect to several unregistered web pages, presumably to download additional unauthorized programs, security researchers at Cisco’s Talos unit said. The malicious program was slipped into legitimate software called CCleaner, which cleans up junk programs and advertising cookies to speed up devices.ĬCleaner is the main product made by London’s Piriform, which was bought in July by Prague-based Avast, one of the world’s largest computer security vendors. This came after security researchers at Cisco Systems Inc CSCO.O and Morphisec Ltd alerted Piriform's parent Avast Software of the hack last week. Piriform said it worked with law enforcement and cut off communication to the servers before any malicious commands were detected. More than 2 million people downloaded tainted versions of Piriform’s program, which then directed the computers to get instructions from servers under the hacker’s control, Piriform said. REUTERS/Kacper Pempel/Illustration/File Photo FILE PHOTO: A man holds a laptop computer as cyber code is projected on him in this illustration picture taken on May 13, 2017.