Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer

The astute reader may have noticed that though the script started with the familiar #! (“Shebang”), it is missing an interpreter such as /bin/bash. However when launched, macOS seems to handle this without issue, and still executed the script.

Specifically, as shown below, in the output of a process monitor, when launched you can first see launchd exec’ing xpcproxy. This then executes /bin/sh, which in turn executes /bin/bash to execute the PoC (which has been translocated, as its from the Internet). Where’s the Interpreter!? (CVE-2021-30853)