Random Shared Comp (Help)

As maflynn said, that indicates the presence of another computer sharing your network. Make sure your network has a long and complex WPA2 password set. You may also want to change it periodically.

It has nothing to do with malware.

Mac Virus/Malware FAQ

 

Yup, as the others have said, you have an intruder!

Change your wifi settings to have a WPA2 password

 

One of them may very well have all the time in the world to try and crack it, after all, retired people have a lot of free time!

Just change your Network's password, reboot the router to kick any device off of it, and see if it comes back.

 

Is it a WPA2 password? Try changing it and see if the shared computer still appears.

 

It's not.

It's another laptop on your network.

No malware, no virus. (Well, you might have it, but this is not a symptom of it.)

 

That appears to be an HP wireless photo printer. Do you own one of those?

 

There has never been a Mac OS X virus in the wild, so you can't be affected by something that doesn't exist. The few trojans that exist in the wild are easily avoided and quite rare for a Mac user to encounter. The presence of a shared device is not an indication of any malware, which means it's not a virus, trojan, etc. Read the link in my earlier post.