This sure looks like malware that isn't hiding itself very well. Well-written malware would infect the kernel and arrange to hide itself completely from the task list. This one clumsily disguises itself as the innocuous
uptime, but does a bad job of it, and
uptime is suspicious anyway because it wouldn't be running for such a long time.
If you confirm that this is malware, read How do I deal with a compromised server?
You're going to have to reinstall the system. Even though the malware looks clumsy, you can't be sure that you'll be able to eradicate it: there may be a part of it that's better hidden.
Before you reinstall, try to figure out how the malware got there. Did you install a program from a bad source? Did you install a program with a known security hole?
Check the logs, the file dates, the command history, etc.
When you reinstall, make sure to get all software from a clean source. Verify the checksum of your installation media against a checksum on the provider's HTTPS website. Stick to software from the distribution as much as possible and make sure that checksum verification is performed (it is by default under Debian). Privilege binaries from the distribution to binaries of less trustworthy origin. Make sure to apply all security updates before activating any Internet-facing services. If you need to install out-of-distribution software, make sure to retrieve it from a reliable source, to get the latest version with no known security holes, and to give it as few privileges as possible. Use strong passwords (if necessary, write them down on a sticky note next to your monitor if you work in a secure area).