You have been hacked and the reason you couldn't log in was because they changed your password. Until you upgrade or at least implement the security fixes, you will continue to be a target - we are seeing a lot of automated hacking attempts against all CubeCart sites. The CCSS looks like part of the CubeCart Security Suite - do you have that installed ? You need to check the snippets installed as the rogue one could be doing literally anything.  Also check other settings especially payment gatew