Steven J. Vaughan-Nichols who is a big Linux Mint fan says that if you used bittorent or did not use a mirror you are safe. 

http://www.zdnet.com/article/has-your-linux-mint-desktop-been-hacked/

On Tue, Feb 23, 2016 at 3:37 PM, Richard Klein <rich@richardklein.org> wrote:
I haven't read the whole story, but apparently intruders managed to
put an ISO on their servers that included a backdoor.  If you
downloaded an ISO from them on Saturday, you're at risk.

http://blog.linuxmint.com/?p=2994
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