5/1/2023 0 Comments Puriform ccleaner malware![]() ![]() Piriform, the developer of CCleaner under Avast, has stated that 2.27 million machines are running the infected installations of CCleaner. It is estimated that approximately 2.3 million systems are infected. This backdoor can provide an entryway for information stealing, code execution, and even opening remote connections to the infected hosts. Now, however, CCleaner version 5.33 and CCleaner Cloud version for Windows 32-bit systems (both released in the middle of August) are not only performing their usual tasks, but are also working as vehicles for malicious malware. It is even considered a security tool, because it allows users to modify executables and clean temporary files that could pose risks. BackgroundĬCleaner has been a trusted registry and file cleaner since 2003, and is installed on millions of machines worldwide. A malicious “backdoor” (an entryway into the software that allows modification and malicious payloads to be executed) had been included in an update. On September 13 th, the threat intelligence group Cisco Talos discovered that a hugely popular free software, CCleaner, had at some point in the last month been compromised during development. ISO 27001: Recipe & Ingredients for Certification.VRM Best Practice Guide for Small to Medium Businesses.ISO 27001 : Recipe & Ingredients for Certification.Architecture Review & Threat Assessment.ISO 27701 – Data Privacy Management System.The MS-ISAC asks that you share this Cyber Alert with other potentially affected entities as CCleaner is commonly used software.Apply the principle of Least Privilege to all systems and services.Review your systems for copies of the compromised files.Review network logs for DNS requests from your organization to the listed domains.If you downloaded either the 32-bit or 64-bit versions, run antivirus and antimalware programs with automatic updates of signatures to quarantine the infected file.If you have installed the Cloud version, verify the auto update feature downloaded and installed a clean version. SLTT government entities should determine if they are running the 32-bit version of CCleaner and if so, check if version 5.33 of the software is currently running on their systems and immediately upgrade to the latest CCleaner version, after appropriate testing.DGA Domains associated with the compromised update:.IP address associated with the compromised update: MD5 hash associated with the compromised update: Indicators of Compromiseįile associated with the compromised update: Piriform warns that they need to finish the incident response process to address any concerns related to the use of its digital certificate. Currently, VirusTotal shows that 40 of 64 detection engines detect the malware. This information can then be used to tailor specific malware for the machine. If the user updated to the 32-bit version of CCleaner, they then executed the infected file, installing the malware.įloxif is a reconnaissance stage malware, with the payload designed to setup communication to a C2 server in order to exfiltrate non-sensitive data (computer name, IP address, list of installed software, list of active software, list of network adapters). Any user updating CCleaner to the infected versions would have downloaded the infected file. The malware was packaged with the CCleaner update in the installation executable, which was signed using a valid digital signature issued to Piriform by Symantec. Users also can clean temporary files, and analyze their system to determine ways to optimize performance. law enforcement and shut down the command and control (C2) server on September 15.ĬCleaner allows users to manage applications and perform routine maintenance on their systems. Updated versions, released on September 12 remediated the issue. (Piriform is owned by Avast.) The August 15 release of CCleaner version and the August 24 update of CCleaner Cloud version were compromised with Floxif malware. The Multi-State Information Sharing and Analysis Center (MS-ISAC) is aware of a supply chain compromise affecting at least two versions of Piriform’s CCleaner software.
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