CentOS 7 Malware? - User "impress+" executes a command ("cron") with a high CPU consumption

One of my "CentOS 7" servers is showing very *strange behavior*. A user named "**impress+**" executes a command called "**cron**". This "cron" command is executed with a **high CPU consumption**. I worry because I suspect it may be **malware**... This server has nothing installed, just "sshd" running. **QUESTION:** What can I do to find out more about this "impress+" user and this "cron" command? **Thanks! =D**