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Firefox.exe in %LocalAppData%

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#1 Daniel Schoonover

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Posted 04 November 2013 - 12:40 PM

I am the IT admin for a law office. After I heard about the CryptoLocker virus on Security Now last week, I started looking at ways to protect my users from infection. I implemented group policy to prevent any executables from AppData, after which, one user reported she was getting an error when running internet shortcuts. Her default browser had been set to %LocalAppData%\Firefox\firefox.exe instead of the one in Program Files (x86). Is there any legit reason for it to be installed in the user profile, or is this something malicious? I am leaning toward wiping the machine anyway, as this user seems to get infected more than most.

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#2 quietman7


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Posted 04 November 2013 - 04:28 PM

I encountered a similar issue while attempting to install Firefox's v25 release. Firefox attempted to install and run the setup file from that folder and it was blocked by policies set in place when using CryptoPrevent.


Programs should not be running from a user profile as they are meant to hold data, preferences, settings, and configuration files. Unfortunately some legitimate programs are still using this folder despite many security tools targeting that location. I had to whitelist the file in order to install it.

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