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MacOS Dylib Injection through Mach-O Binary Manipulation

Malware Unicorn via Independent

Overview

This workshop is designed for those looking to develop offensive tooling or learning the technique for defense purposes. The content will cover developing stager code and shellcode for dynamic library injection in macOS environments (Mojave 10.14 & Catalina 10.15) with Golang compiled binaries. The topics covered will include compiling Go dylibs, parsing Mach-O headers, binary code caves, binary entrypoint redirection, typical assembly routines used in shellcode, and understanding the Mach-O load order.

Syllabus

Introduction
Background
Compiling a Go dylib with C-Shared Build Mode
Parsing the Mach-O Header
Entrypoint Redirection
Loading the Dylib in Memory
Appendix

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