List of installed software, including Windows updates.The malicious software was programmed to collect a large number of user data, including: "The encoded information was subsequently submitted to an external IP address .x (this address was hardcoded in the payload, and we have intentionally masked its last two octets here) via a HTTPS POST request." "All of the collected information was encrypted and encoded by base64 with a custom alphabet," Moreover, the unknown hackers signed the malicious installation executable (v5.33) using a valid digital signature issued to Piriform by Symantec and used Domain Generation Algorithm (DGA), so that if attackers' server went down, the DGA could generate new domains to receive and send stolen information. Earlier this year, update servers of a Ukrainian company called MeDoc were also compromised in the same way to distribute the Petya ransomware, which wreaked havoc worldwide.Īvast and Piriform have both confirmed that the Windows 32-bit version of CCleaner v and CCleaner Cloud v were affected by the malware.ĭetected on 13 September, the malicious version of CCleaner contains a multi-stage malware payload that steals data from infected computers and sends it to attacker's remote command-and-control servers. This incident is yet another example of supply chain attack. Security researchers from Cisco Talos discovered that the download servers used by Avast to let users download the application were compromised by some unknown hackers, who replaced the original version of the software with the malicious one and distributed it to millions of users for around a month. If you have downloaded or updated CCleaner application on your computer between August 15 and September 12 of this year from its official website, then pay attention-your computer has been compromised.ĬCleaner is a popular application with over 2 billion downloads, created by Piriform and recently acquired by Avast, that allows users to clean up their system to optimize and enhance performance.
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