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In an email to Bleeping Computer, Avast CTO Ondrej Vlcek said that updating CCleaner to the most recent versions fixes any issues, as "the only malware to remove is the one embedded in the CCleaner binary itself." "The affected software (CCleaner v and CCleaner Cloud v) has been installed on 2.27M machines from its inception up until now," Vlcek also added. Updating to Recent Versions Removes Malware
CCLEANER MALWARE 2021 UPDATE
On September 13, Piriform released CCleaner 5.34 and pushed an update (v) to CCleaner Cloud users that do not contain the malicious code.
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The company said they found the malware in CCleaner version and CCleaner Cloud version. Piriform acknowledged the incident in a blog post today.
CCLEANER MALWARE 2021 CODE
It is unclear if this threat actor breached Avast's systems without the company's knowledge, or the malicious code was added by "an insider with access to either the development or build environments within the organization."Īvast bought Piriform - CCleaner's original developer - in July this year, a month before CCleaner 5.33 was released.
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Cisco Talos believes that a threat actor might have compromised Avast's supply chain and used its digital certificate to replace the legitimate CCleaner v5.33 app on its website with one that also contained the Floxif trojan. While initially, this looked like another case where a user downloaded a fake, malicious CCleaner app, they later discovered that the CCleaner installer was downloaded from the official website and was signed using a valid digital certificate. Researchers identified a version of CCleaner 5.33 making calls to suspicious domains. Threat Actor Compromised CCleaner InfrastructureĬisco Talos security researchers detected the tainted CCleaner app last week while performing beta testing of a new exploit detection technology. The malware also quit execution if the user was not using an administrator account. Researchers noted that the malware only ran on 32-bit systems. The malware collected information such as computer name, a list of installed software, a list of running processes, MAC addresses for the first three network interfaces (to identify other devices on the network), and unique IDs to identify each computer in part. The malware also had the ability to download and run other binaries, but at the time of writing, there is no evidence that Floxif downloaded additional second-stage payloads on infected hosts. Floxif is a malware downloader that gathers information about infected systems and sends it back to its C&C (Command and Control) server. Version 5.33 of the CCleaner app offered for download between August 15 and September 12 was modified to include the Floxif malware, according to a report published by Cisco Talos. As always, if you require assistance, give us a call! – Yellowstone ComputingĬCleaner Compromised to Distribute Malware for Almost a Month If you are using CCleaner on your PC(s), you should either update to the current version or remove it. Details of this incident are included below. CCleaner is made by Piriform, a company which was acquired by Avast (makers of the popular Avast Antivirus) in July of this year. It was disclosed this past Monday (September 18th) that the popular cleaning utility CCleaner had been compromised by currently unknown threat actor that modified CCleaner to include the Floxif malware.