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It allocates PAGE_EXECUTE_READWRITE memory to which it copies the previously decoded payload (minus the IMAGE_DOS_HEADER) as shown below.Ġ000000: 0000 0000 0000 0000 0000 0000 0000 0000. This function is used to retrieve the addresses of functions such as VirtualAlloc, memcpy, and LoadLibrary. It attains the PEB (Process Environment Block) of the malware process to load kernel32.dll and find the location of the function GetProcAddress. The shellcode is responsible for loading the payload in memory. Next, the program creates a memory heap with the flag HEAP_CREATE_ENABLE_EXECUTE to allow for execution, and copies the shellcode on the heap, and executes it. The missing IMAGE_DOS_HEADER is likely to subvert AV solutions that search for MZ (0x4d5a) headers in memory. The result of the decoding subroutine is shellcode and the payload (which is missing the IMAGE_DOS_HEADER field). This takes place even before the entry point (EP) of the utility is reached.The new execution flow leads to a function that decodes a blob of data, as reproduced in Python below:
The affected version of the utility contains a modified _scrt_common_main_seh function that routes the execution flow to a custom function meant to decode and load the malware.
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Technical Analysis CCleanerĬCleaner is a PC cleaning utility developed by Piriform, which was recently acquired by antivirus (AV) provider Avast in June 2017. The report also outlines the potential for additional adversary tactics, techniques and procedures (TTPs). (More information on targeted industries is available for CrowdStrike customers in our Falcon Intelligence™ portal.) CrowdStrike’s threat intelligence team had also previously reported on the malware’s C2 (command and control) infrastructure in a recent alert for CrowdStrike customers identifying possible links to Aurora Panda.
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A popular PC optimization tool, the 5.33 version of CCleaner has had widespread distribution across multiple industries, but the embedded code appeared to actually be targeted at specific groups in the technology sector.
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To help inform the user community and empower them to better defend against software supply chain attacks, the CrowdStrike® Security Response Team (SRT) conducted a thorough analysis of the CCleaner backdoor. The recent backdoor that was discovered embedded in the legitimate, signed version of CCleaner 5.33, is just such an attack. However, threat researchers have another definition: To them, supply chain attacks can also denote the growing phenomenon in which malicious code is injected into new releases and updates of legitimate software packages, effectively turning an organization’s own software supply infrastructure into a potent and hard-to-prevent attack vector. A well-known retail chain’s massive breach in 2013 is a classic example: Adversaries used a poorly protected HVAC vendor as their gateway to hack into the giant retailer’s enterprise network. To the general business community, it refers to attacks targeting vulnerable third-parties in a larger organization’s supply chain.
Make sure to restore before August 15 which is when version 5.3 rolled out.The term “supply chain attacks” means different things to different people. To be completely safe you can also do a restore of your computer. If you have used the infected software, delete the software immediately and run an antivirus scan. It also only affects Windows users who have the 32-bit version of CCleaner. If you haven’t updated to version 5.3, you’re safe.
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The affected version is 5.3 and right now the latest update is 5.3.4. A diagram of the malware process can be seen below.įirst, the free version of CCleaner doesn’t do automated updates. Talos isn’t clear on what exactly the malware was supposed to do.
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On Septemwhile conducting customer beta testing of our new exploit detection technology, Cisco Talos identified a specific executable which was triggering our advanced malware protection systems…it appears that the affected version (5.33) was released on August 15, 2017…It is also important to note that while previous versions of the CCleaner installer are currently still available on the download server, the version containing the malicious payloads has been removed and is no longer available.
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