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All this information was encrypted and transmitted to a remote address (.x), which then sent a second-stage payload containing further encrypted information.
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It collected a host of information about the infected system including its name, software installed, MAC addresses etc.
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Piriform says that the suspicious code stored certain information in the registry key, HKLM_Software_Piriform_Agomo that also included the IP address of the Command and Control (CnC) server. The highly obfuscated illegal code created a 16KB DLL that executed in a separate thread and continued to run in the background while the actual program was being run. Of particular importance is the fact that the original binary had a valid digital certificate, which could imply that Piriform's certification process itself was compromised. Hackers inserted a two-stage backdoor that could remotely execute code and transmit back user info in an encrypted form. In a technical blog post, Paul Yung, VP, Products from Piriform, detailed about the illegal code modification that affected nearly 2.27 million users of the product. This led to the conclusion that the program's binary was illegally modified to transmit user info to the hacker. On September 12, certain 32-bit versions of CCleaner () and CCleaner Cloud () were found to transmit data to an unknown IP address, prompting Piriform to start an investigation in collaboration with Avast Threat Labs. The malware is a backdoor that disguised itself within the app's runtime and therefore, went largely unnoticed until Piriform noticed something suspicious.
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"Those impacted by this supply chain attack should not simply remove the affected version of CCleaner or update to the latest version, but should restore from backups or reimage systems to ensure that they completely remove not only the backdoored version of CCleaner but also any other malware that may be resident on the system," the company said.CCleaner, the popular PC cleaning app from Piriform (now part of Avast), has been found to be infected with malware that can potentially sniff out user data in the background without the user even knowing it. While Avast has recommended that consumers update to a clean version of the software and remove the tainted version, Cisco has gone further in recommendations to companies which may have been involved. Targeting high-profile targets with a seemingly innocuous and innocent piece of software is a clever method, but seeking information from these groups suggests that the general public is not the true focus of the campaign. No damage may have been detected as of yet, but the addition of these C&C instructions does suggest the breach is more serious than first believed.
It's important to note that this cannot be relied on for attribution."
"Interestingly, this configuration specifies "PRC" as the time zone, which corresponds with People's Republic of China (PRC). "The web server also contains a second PHP file (init.php) that defines core variables and operations used," Cisco says. If a system met the malware's requirements, the second payload would be deployed to create a backdoor and potentially pave the way for attackers to steal information and spy on the target companies. This information was then stored in an SQL database.
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The server would implement a series of checks in order to avoid the efforts of security researchers as well as gather information from infected systems, such as OS version, architecture, and whether admin rights were in play. The C&C server contained PHP files responsible for handling communication between infected PCs and threat actors. "These new findings raise our level of concern about these events, as elements of our research point towards a possible unknown, sophisticated actor." "This would suggest a very focused actor after valuable intellectual property," the team says.
Based on a review of the C&C's tracking database - which covers only four days in September - at least 20 victim machines from these companies were in line to be served secondary payloads.
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