Some months ago i have patched my magento with:
- SUPEE-1533
- SUPEE-5344
- SUPEE-6285
- SUPEE-5994
- SUPEE-6482
- SUPEE-6788
and i patched using this instruction https://magentary.com/kb/install-supee-6788-without-ssh/ for all the patch. After that i checked with this https://magento.com/security-patch and everithing was ok.
Last week i found inside System->Configuration->General->Design->Html Head->Miscellaneous Scripts a javascript code that was very very strange and i deleted it
In your opinion there is something else i have to check like core files etc...?
Thank you for your suggestion