Developer Mode-as-a-Defense: How iOS Security Features Deter Nation-State Spyware

The report details reverse-engineering of the Predator nation-state commercial spyware and documents that the implant queries the kernel sysctl security.mac.amfi.developer_mode_status to detect iOS Developer Mode; if enabled it reports error code 301, cleans traces, and terminates. Based on this behavior the authors recommend enabling Developer Mode only on devices running Jamf Mobile Forensics to combine enhanced forensic access with an adversary-deterrent signal that causes sophisticated implants to abort.