Its analysis harder (encrypted strings, indirect API calls, etc.). The code executed within that thread was heavily obfuscated to make Illustration of patched CRT code (see the added call to a payload-decryption routine in the modified version): This DLL was subsequently loaded and executed in an independent thread.Īfterwards, a normal execution of CRT code and main CCleaner continued, resulting in the thread with payload running in the background. The result (16 kB in size) was a DLL (dynamic link library) with a missing MZ header. It decrypted and unpacked hardcoded shellcode (10 kB large) - simple XOR-based cipher was used for this. ![]() This modification performed the following actions before the main application’s code: This code modification wasĮxecuted by the following function calls (functions marked by red represent the CRT modifications): ![]() Inserted during compilation by the compiler. Initialization code called CRT (Common Runtime) that is normally The suspicious code was hidden in the application’s Two-stage backdoor capable of running code received from a remote IP Modification of the CCleaner.exe binary resulted in an insertion of a In other words, to the best of our knowledge, we wereĪble to disarm the threat before it was able to do any harm. Users of CCleaner Cloud version have received anĪutomatic update. We’re moving all existing CCleaner v users to the latest Other potential servers are out of the control of the attacker, and Threat has now been resolved in the sense that the rogue server is down, Before delving into the technical details, let me say that the We also immediatelyĬontacted law enforcement units and worked with them on resolving the Public, and we started an investigation process. Of CCleaner Cloud was illegally modified before it was released to the Based on further analysis, weįound that the version of CCleaner and the version A suspicious activity was identified on September 12 th,Ģ017, where we saw an unknown IP address receiving data from softwareįound in version of CCleaner, and CCleaner Cloud version ![]() Recently found in CCleaner version and CCleaner Cloud version We would like to apologize for a security incident that we have It found 32 drivers to update across audio, Bluetooth, biometric and more (152 were up to date).Here is the official word from Piriform, who makes CCleaner.ĭear CCleaner customers, users and supporters, Note that the Professional version allows you to schedule cleaning, while SmartCleaning will automatically clean when you hit a certain amount of junk (500MB by default).ĭriver Update does what it says and aims to make sure everything is up to date and therefore running as well as it can be. In total, CCleaner was able to free up 3.09GB of space. So, removing them could slow down certain things. Again, this took a matter of seconds (2.79 according to the application) and found 1.9GB to remove mainly cache files and, although that’s a good amount of space to free up, remember that cache files are there to make things like web browsing faster. There’s a Custom Clean option which can analyse Windows and Applications. You can select which junk to remove, but only in groups of different types like Recycle Bin, Temporary Application Files and Temporary System Files. On my test laptop, the search found 7,371 trackers, 792MB of junk and a single app to update – Audacity in this case.
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