That sounds extremely dodgy to me as well. If you are noticing connections from an external IP address that you have not made yourself (e.g. via knowingly being online), it could potentially indicate that the device is compromised. Have you noticed any other unusual things with your computer lately, such as your internet traffic being redirected to other websites, unusual toolbars, or pop-ups (any pop-up that appears while you have not opened your internet browser is a surefire sign of malware). Also, do not under any circumstances access anything with your financial information on any potentially infected device. If one is being hacked, it's almost always money that they're after in one way or another. Typically, the hackers are an outright thief who is looking to steal someone's hard earned money, connecting a bunch of computers through a botnet in order to do devious things online while hiding their IP address, or seeking to redirect your internet traffic to websites/ads that they are profiting from (or any combination of the above). Also, an absence of computer symptoms doesn't just mean you are okay. It could mean that either the malware is not being actively used at the moment OR it is being used in a manner that is stealthy enough that you aren't able to easily notice it (which doesn't necessarily mean that they couldn't be actively stealing info or using your computer for nefarious purposes).
