The remote host has been compromised and is running a 'backdoor' program.
The remote host appears to be running a machine that is a server within a botnet network. A botnet is a network of compromised computers that are remotely controlled by a malicious bot administrator. Botnets are commonly used for sending spam running Denial of Service (DoS) attacks against other networks scanning and compromising new systems installing sniffers installing keyloggers identify theft
Manually inspect the machine for malicious processes. In addition, you may wish to consider installing security software that detects and blocks this sort of malicious software.