The Trojan proceeds to install a LaunchAgent, which gives the malware a foothold in the OS and lets it run scripts that control system processes, launch itself again and again, and generally make itself very difficult to get rid of. What if you’re not protected?īut what if the malware figures out that it’s on a system that a.) isn’t a VM and b.) isn’t protected by antivirus software? If it sees that the system is protected, once again, it’s “abort mission” time. If the program discovers that it’s in a VM (and thus might be seen by a security analyst), it simply won’t run.ĬrescentCore also determines whether or not the user’s system is running third-party antivirus software-i.e., another possible means of detection. In other words, CrescentCore wants to know if it’s being watched! So why does CrescentCore want to know if it’s in a VM?īecause virtual machines are used by security researchers to study malware safely (as opposed to just downloading malware onto their computers, which would be a very bad idea). VMs are virtualized operating systems running on a system’s actual operating system (sort of like an OS within an OS). Once downloaded, CrescentCore checks to see if it’s running inside a virtual machine, or VM. dmg file-the same sort of disk image file format that a legitimate app might use. It’s disguised as an Adobe Flash Player installer, which unsuspecting users would download onto their system as a. What does it look like?ĬrescentCore is a Trojan. Security researchers at Intego have discovered a new form of Mac malware-one that shows some surprisingly sneaky behaviour aimed at evading detection by antivirus software and human malware hunters alike.ĭubbed “CrescentCore”, this clever little program is yet another example of what developers have been saying for a while now: macOS malware is on the rise…and it’s getting more and more sophisticated. New Mac Malware Knows When You’re Watching
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