This is just an attack that attempts common username/password combinations on ssh, and the article even states that the worm is dime-a-dozen. Unless you have both password auth enabled and an available account with an easily guessable password (and if you have either you should change that), this is nothing to worry about, even with sshd available to the internet.
Sensationalist title.
Can't beat an X230 with an i5 for that use case, and you can still find them for around 100 bucks. Swap in an X220 keyboard, maybe a new battery, coreboot it, and in my opinion you've got the perfect laptop. I've daily driven that setup for the last 5 years and it's been great.