The hack was discovered by Cisco Talos on 9/13, who found that the official download of the free versions of CCleaner 5.33 and CCleaner Cloud also contained “a malicious payload that featured a Domain Generation Algorithm as well as hardcoded Command and Control functionality.” “In other words, to the best of our knowledge, we were able to disarm the threat before it was able to do any harm,” said Paul Yung, Piriform’s vice president of products, in a statement. They believe they have shut down the hackers’ access to its users and updated their software. Piriform apologized to its users and said law enforcement was involved. “Piriform believes that these users are safe now as its investigation indicates it was able to disarm the threat before it was able to do any harm,” says an Avast spokesperson. The program is used to clean up cookies and can give some web privacy protection.ĬCleaner has been downloaded more than 2 billion times, making it an very interesting target for hackers.Īvast Piriform believes it was able to prevent the breach harming customers, however that remains to be seen, Piriform hasn’t completed its investigation. Yes, the hackers modified the download files on Avast Piriform servers.Ģ.27 million users have been affected by the attack. If I downloaded CCleaner from the official website can I still be affected? Uninstall CCleaner or upgrade to CCleaner version 5.33 from here I use 32-bit, but an older version than 5.33 am I safe? If I have a 64-bit PC could I be affected: People who have downloaded CCleaner version 32-bit version download between August 15th and September 12th.
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