It launched an investigation with Czech intelligence officials and police that included quietly monitoring the attacker’s activity rather than immediately evicting it from the network. The hacker or hackers had been trying to get into Avast’s network since May, but the company did not notice something was amiss until Sept. The more recent attack on CCleaner was also persistent. The goal of the operation, which analysts believe was the work of a Chinese state-sponsored group, was reportedly to steal intellectual property from CCleaner customers. In the 2017 hack, the attackers signed their malware with a legitimate Avast certificate, a technique that is the hallmark of a clever supply-chain breach. The 2017 breach of CCleaner is often cited by security experts to illustrate the threat of wide-ranging supply-chain hacks.
“We do not know if this was the same actor as before and it is likely we will never know for sure,” she wrote. “t is clear that this was an extremely sophisticated attempt against us that had the intention to leave no traces of the intruder or their purpose,” Baloo wrote in a blog post. Avast, which boasts of 400 million users of its products around the world, said it will study its network logs to learn more about the intrusion. Those measures, Avast CISO Jaya Baloo assured customers, were enough to ensure that CCleaner users were unaffected by the attack.
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Worried that the attackers would manipulate CCleaner again, Avast said it halted an upcoming release of the product, revoked its previous security certificate, and put out a security update to users. The target of the persistent attack was likely Avast’s software-cleaning tool, CCleaner - the same product that was infiltrated in an infamous 2017 supply-chain attack breach that affected over 2 million computers.
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By exploiting the trust relationship between software vendors and the users of their software, attackers can benefit from users' inherent trust in the files and web servers used to distribute updates.An unidentified attacker used stolen credentials to gain high-level privileges on the network of Czech software security vendor Avast, the company said Monday. This is a prime example of the extent that attackers are willing to go through in their attempt to distribute malware to organizations and individuals around the world.
That and you don’t expect an antivirus firm to infect you with malware. Taking advantage of that trust is partially why this attack is so distressing. If you installed it, then go grab a clean version of CCleaner now if you intend to keep using the software.ĬCleaner has been popular for years, trusted by tech-savvy users. The freebie version won’t automatically update to a version without a backdoor. At the time of this writing that is version 5.34. Users should also update to the latest available version of CCleaner to avoid infection. Affected systems need to be restored to a state before August 15, 2017, or reinstalled. If even a small fraction of those systems were compromised, an attacker could use them for any number of malicious purposes. Cisco Talos said, “The impact of this attack could be severe given the extremely high number of systems possibly affected.” Piriform previously claimed that there have been 2 billion total CCleaner downloads with an additional 5 million weekly installs. Piriform said, “It would have been an impediment to the law enforcement agency’s investigation to have gone public with this before the server was disabled and we completed our initial assessment.”Īn estimated 2.27 million systems installed the infected CCleanerĪlthough Avast doesn’t want users to panic, it admitted to Forbes that an estimated 2.27 million systems installed the backdoored versions. This freeware is an all in one utility that can clean your PC, stop errors, freezes, and crashes. 24, the company released a non-malware tainted version on Sept. Glary Utilities: It is another software like CCleaner and one of the best CCleaner alternatives is Glary Utilities. Piriform confirmed the attack, saying Avast “determined on the 12th of September that the 32-bit version of our CCleaner v and CCleaner Cloud v products, which may have been used by up to 3% of our users, had been compromised in a sophisticated manner.” A non-backdoored version of CCleaner was released the same day.Īs for the compromised cloud version, CCleaner Cloud v, which was released on Aug.
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It is also possible that an insider with access to either the development or build environments within the organization intentionally included the malicious code or could have had an account (or similar) compromised which allowed an attacker to include the code.” Cisco Talos researchers said, “It is likely that an external attacker compromised a portion of their development or build environment and leveraged that access to insert malware into the CCleaner build that was released and hosted by the organization.
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