Short answer: this is not an indication of a problem, just a side effect of the somewhat haphazard way things try to figure out your computer's "name".
Long answer: The standard command prompt includes the computer's hostname, the directory you're in, and your username. The problem here is how the "hostname" is determined. You probably have a computer name set in System Preferences -> Sharing, right? Well, it'll sometimes use that... but before "trusting" that it tries a reverse DNS lookup on your primary IP address, and if it gets back a name from the DNS server, it treats that as more authoritative than what you put in Sharing prefs. But often the DNS server doesn't really have a name to go with your IP address so it makes something up, or takes a guess, or something like that, and you wind up with something weird in your prompt.
In this case, I'm guessing your Mac's primary IP address is 201.100.226.146, right? A reverse DNS lookup on that gives the full DNS name dsl-201-100-226-146-sta.prod-empresarial.com.mx, so your Mac takes the hostname portion -- the bit before the first "." -- and uses that as your hostname. Resetting your Mac won't have any effect on it, because it's coming from your Internet connection. But if you switch Internet connections -- say, by going to the local coffee shop and using their Internet -- you'll get a different name (or no DNS name, in which case it'll use what you put in the Sharing prefs).
If it really bugs you, you can override it with sudo scutil --set HostName "hostnameyoudratheruse", but I wouldn't bother; just ignore it.
As for the info you're getting from lsof, it's a bit unclear what rapportd does, but it seems to be a standard Apple process, not anything suspicious. See "What is rapportd and why does it want incoming network connections?" on Ask Different.
