![]() Williams said that Talos detected the issue at an early stage, when the hackers appeared to be collecting information from infected machines, rather than forcing them to install new programs. ![]() CCleaner does not update automatically, so each person who has installed the problematic version will need to delete it and install a fresh version, he said. The nature of the attack code suggests that the hacker won access to a machine used to create CCleaner, Williams said. A new, uncompromised version of CCleaner was released the same day and a clean version of CCleaner Cloud was released on September 15, it said. Piriform said that Avast, its new parent company, had uncovered the attacks on September 12. ![]() 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. A version of CCleaner downloaded in August 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. At the time of the acquisition, the company said 130 million people used CCleaner. It 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. The malicious program was slipped into legitimate software called CCleaner, which is downloaded for personal computers and Android phones as often as five million times a week. Hackers broke into British company Piriform’s free software for optimizing computer performance last month potentially allowing them to control the devices of more than two million users, the company and independent researchers said on Monday.
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