macOS FlexibleFerret | Further Variants of DPRK Malware Family Unearthed www.sentinelone.com/blog/maco…

Last week Apple pushed a signature update to its on-device malware tool XProtect to block several variants of what it called the macOS Ferret family: FROSTYFERRET_UI, FRIENDLYFERRET_SECD, and MULTI_FROSTYFERRET_CMDCODES. This DPRK-attributed malware family was first described by researchers in December and further in early January and identified as part of the North Korean Contagious Interview campaign, in which threat actors lure targets to install malware through the job interview process.

In this post, we briefly recap previous research for context, including Apple’s contribution through its malware signatures, before describing newly discovered samples that we have labelled ‘FlexibleFerret’ and which remain undetected by XProtect at the time of writing.