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trparky

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  1. The only version affected is the 32-bit binary of CCleaner v5.33.6162.

    The problem is that on 64-bit systems the 32-bit binary is still part of the installation (there's a CCleaner.exe and a CCleaner64.exe). Here's my assumption so you can correct me if I'm wrong. When you launch CCleaner the CCleaner.exe (32-bit) file is the one that's initially started even on 64-bit systems which upon launch the CCleaner.exe (32-bit) binary detects that your system is a 64-bit OS, launches the CCleaner64.exe binary, and then the 32-bit version exits. So if my assumption is correct here it doesn't matter if the 32-bit binary was the only one that was infected, 64-bit OS or not... you're still going to become infected.

     

    Heck, even the Scheduled Task that allows CCleaner to be auto-elevated without a UAC prompt is pointing to the CCleaner.exe (32-bit) binary.

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