Talos published very convincing logs of attempts by infected machines to hook into the bot Command sites. Ccleaner malware version 5 install#If you install CCleaner 5.33, your machine hooks into a bot network. The details are complex, but the upshot is clear: Somebody managed to tack a malware package onto the legitimate distribution file for CCleaner. If you installed CCleaner 5.33, you're infected During the installation of CCleaner 5.33, the 32-bit CCleaner binary that was included also contained a malicious payload that featured a Domain Generation Algorithm (DGA) as well as hardcoded Command and Control (C2) functionality. …Įven though the downloaded installation executable was signed using a valid digital signature issued to Piriform, CCleaner was not the only application that came with the download. 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. Ccleaner malware version 5 software#Talos recently observed a case where the download servers used by software vendor to distribute a legitimate software package were leveraged to deliver malware to unsuspecting victims. (Piriform was bought by antivirus giant Avast in July.)Įdmund Brumaghin, Ross Gibb, Warren Mercer, Matthew Molyett, and Craig Williams at Talos report: I just checked, and the current version available from Piriform is version 5.34. 11.Īfter notifying Piriform, CCleaner was, ahem, cleaned up and version 5.34 appeared on Sept. 15 and which, according to Talos, was still the primary download on the official CCleaner page on Sept. Talos Intelligence, a division of Cisco, just published a damning account of malware that it found hiding in the installer for CCleaner 5.33, the version that was released on Aug. 15, a couple of nasty programs came along for the ride. Ccleaner malware version 5 free#"The oldest malicious executable used in the Russian attack was built in 2014, which means the group behind it might have been spying for years."īased on their analysis of the ShadowPad executable from the Piriform network, Avast believes that the malicious attackers behind the malware have been active for a long time, spying on institutions and organizations so thoroughly.If you installed the free version of CCleaner after Aug. "Our investigation revealed that ShadowPad had been previously used in South Korea, and in Russia, where attackers intruded a computer, observing a money transfer." Avast said. However, the company has no proofs if the third stage payload with ShadowPad was distributed to any of these targets. Moreover, it was found that the attackers were then able to install a second-stage payload on 40 selected computers operated by major international technology companies, including Google, Microsoft, Cisco, Intel, Samsung, Sony, HTC, Linksys, D-Link, Akamai and VMware. The malicious version of CCleaner had a multi-stage malware payload designed to steal data from infected computers and send it back to an attacker-controlled command-and-control server.Īlthough Avast, with the help of the FBI, was able to shut down the attackers' command-and-control server within three days of being notified of the incident, the malicious CCleaner software had already been downloaded by 2.27 million users. September 13, 2017-Researchers at Cisco Talos detected the malicious version of the software, which was being distributed through the company's official website for more than a month, and notified Avast immediately. July 18, 2017-Security company Avast acquired Piriform, the UK-based software development company behind CCleaner with more than 2 billion downloads.Īugust 2, 2017-Attackers replaced the original version of CCleaner software from its official website with their backdoored version of CCleaner, which was distributed to millions of users. NET runtime library).īetween mid-April and July-During this period, the attackers prepared the malicious version of CCleaner, and tried to infiltrate other computers in the internal network by installing a keylogger on already compromised systems to steal credentials, and logging in with administrative privileges through RDP. April 12, 2017-A few days later, attackers installed the 3rd stage payload on four computers in the Piriform network (as a mscoree.dll library) and a build server (as a.
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