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This attack will add file_put_contents()
as the access_callback
in your menu_router
table.
Subsequently, that path is used attempt to drop more exploit code.
Look in menu router for file_put_contents and remove it if found.
It seems that the file has random name and randomly gets inserted in one of the modules subdirectory, as i seen in in different directories on couple of my sites.
More info on how to find it and delete it: http://www.zoubi.me/blog/drupageddon-updating-drupal-732-not-enough-your-site-may-already-be-hacked