While Windows holds the largest market share on malware, macOS has its fair share of threats that mostly exist in an adware/grayware area. In this post I want to walk through how a Pirrit PKG file installer works. There are lots of more complex threats, but this is a good place to start if you’re just jumping into analysis. If you want to follow along at home, I’m working with this file in MalwareBazaar: https://bazaar.abuse.ch/sample/d39426dbceb54bba51587242f8101184df43cc23af7dc7b364ca2327e28e7825/.

Analyzing OSX.DazzleSpy A fully-featured cyber-espionage macOS implant

Earlier today (January 11th), Researchers at Intezer published an report titled, “New SysJoker Backdoor Targets Windows, Linux, and macOS.” In this report, they detailed a new cross-platform backdoor they named SysJoker. Though initially discovered on Linux, the Intezer researchers shortly thereafter also found both Windows and Mac versions: *"SysJoker was first discovered during an active attack on a Linux-based web server of a leading educational institution. After further investigation, we found that SysJoker also has Mach-O and Windows PE versions." -Intezer*