You may have heard about “Dirty Sock”, a recently discovered vulnerability targeting snapd sockets, playing on the name of a previous vulnerability called “Dirty Cow”. Snapd allows for the execution of packaged snaps, which are a mechanism to distribute and update applications in a standard format.
The first week of February 2018 has seen another piece of macOS malware — CreativeUpdater malware. This time a cryptominer masquerading as several different software packages on the MacUpdate.com website. Again, even a few days later, a lot of endpoint solutions are not necessarily picking this up, looking at VirusTotal.
Seeing on Twitter that Patrick Wardle (a must follow for macOS security!) may have found his first piece of macOS malware for 2018, I eagerly flipped to his blog. Given that this is “new” malware on macOS, there is likely going to be a window between discovery and protection via A/V software.
Update: Following this article's original publication, Apple released a somewhat confusing set of security updates, which invalidates some of the original content I had shared. I have posted a follow-up here and updated the version number in the determination query in this article.
Tuesday’s event of a vulnerability in macOS High Sierra (tagged #iamroot by some) was a great chance to explore the utility of using osquery in response to a previously unknown security threat. [See this post for other macos malware identification tips]
There have been several instances where malware has been introduced to OS X machines in the past few months via “supply chain attacks”. This is where a vendor is tricked into distributing, or is compromised in a way, that their legitimate software is either replaced by or includes malware in the distribution bundle.