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Linux devices are under attack by a never-before-seen worm
(arstechnica.com)
This is a most excellent place for technology news and articles.
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.
Thank you, spared me from giving attention to an unworthy article
savedusaclick
Hell, even having a lax fail2ban stops these attacks.
Prevention, as always, is much easier than a cure.