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Law enforcement and a private firm are now working with Avast to investigate the situation. “Ideally this certificate should be revoked and untrusted moving forward.” “The presence of a valid digital signature on the malicious CCleaner binary may be indicative of a larger issue that resulted in portions of the development or signing process being compromised,” a blog post by Talos reads.
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The incident calls into question the “integrity and security” of Piriform’s software development process, Williams explained.Īnytime a malware sample is signed with actual certs you have to question the integrity and security of your build system Researchers believe an insider was likely involved at some point in the attack, according to Talos senior researcher Craig Williams, because the hacker was able to sign the malware with a legitimate Avast software certificate.
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While a patch has been offered to fix the problem, several important questions remain, including who was responsible.
There have been multiple iterations of the tool since then. “We believe that these users are safe now as our investigation indicates we were able to disarm the threat before it was able to do any harm.”ĬCleaner has been downloaded more than 2 billion times since it was originally released in 2003. “We estimate that 2.27 million users had the affected software installed on 32-bit Windows machines,” an Avast spokesperson told CyberScoop. The program is predominantly used on computers running Windows, although there’s also a version for MacOS. Piriform, a British software firm acquired by Avast in July, originally developed CCleaner.
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The affected version, CCleaner 5.33, was only available for download for about one month. The latest version of CCleaner was released in mid-September. The news illustrates how hackers are actively targeting and in some cases, successfully exploiting vulnerabilities in the supply chains of prominent software vendors. The backdoor left infected devices open to future attacks and other malware.
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“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.Security researchers say hackers were able to booby-trap a popular tool offered by Czech cybersecurity firm Avast to remotely install a backdoor implant on millions of computers, according to new research by Cisco’s Talos team.Ī sabotaged software update mechanism in an outdated version of the file clean-up software program CCleaner allowed for a hacker to covertly download malicious code onto computers. 2.27 million users have been affected by the attack, and Avast Piriform believes it was able to prevent the breach harming customers. Dubbed “crap cleaner,” it’s designed to wipe out cookies and offer some web privacy protections. “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,” says the Talos team.ĬCleaner has been downloaded more than 2 billion times according to Avast, making it a popular target for hackers.
Security researchers at Cisco Talos discovered that download servers used by Avast (the company that owns CCleaner) were compromised to distribute malware inside CCleaner. Hackers have successfully breached CCleaner’s security to inject malware into the app and distribute it to millions of users.
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