Concern over computer security should not be conditional on what the press and the social-media echo chamber is reporting. Or what the press and the echo chambers are not reporting.
Concern over security is an on-going requirement.
This means complete backups, multiple ("deep") copies (as backup media can fail), and preferably disconnected. Your backups are one of the easiest and best paths to recovery when your system is breached, and preferably a copy of the backup that predates the breach, and has been kept offline.
Using proper passwords and/or certificates, of course. On all users.
Not downloading "codecs" or "players" from any site other than the original source of the tool. There are a number of download sites around, and various of those sites are busily optimizing themselves to the top of Google search results. Downloading tools from sources other than from the original producer or from producer-designated sites can have additional risk; you're not necessarily getting (just) what you expect. If you didn't go looking for the tool yourself, do not download it. With OS X, look to use the Mac App Store as your source.
Don't click on links embedded in mail you've received, even if it looks to be a trusted source. This includes social media messages received via mail, including LinkedIn mail, etc.
Firewalls and VPNs, as well as checking logs.
Maintaining current versions of Java, Safari and Adobe Flash Player, as well as other installed software. Verifying that any web-facing tools you're using (client or server) are current.
Disabling the automatic opening of "safe" files, and disabling Java access in the browser (or not installing it), and disabling (or removing) Adobe Flash Player, are all normal and expected practice, here.
As for your original question, there's a Terminal.app sequence that's been posted by F.Secure to investigate whether your clients have been infested by the so-called OSX/Flashback.K malware. It's a little arcane, if you're not familiar with Terminal. It's not the first Mac malware that's been around, and it certainly won't be the last.
