Individual skill

reverse-eng-macos

Reverse macOS Mach-O binaries and .app bundles — codesign/notarization state, entitlements, Objective-C/Swift symbol recovery, and lldb/Frida dynamic analysis. Load when the target is a Mach-O executable/dylib/framework, an .app bundle, a LaunchAgent/Daemon plist, or Apple-platform malware. Signals: "Mach-O 64-bit executable", codesign/spctl output, hardened runtime, objc_msgSend, mangled _ZN/_$s symbols, XPC service names, TCC prompts.

skills/reverse-engineering/reverse-eng-macos/SKILL.md

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Observed behavior: Instructions only
Last checked: Nov 11, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

agent-skills Repository topic
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application-security Repository topic
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detection-engineering Repository topic
gemini Repository topic
engineering Derived category

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# macOS / Mach-O reversing

## When it applies
The target is a Mach-O binary, dylib, framework, or `.app` bundle on macOS (or a sample you can
read offline), and it is in scope (`tradecraft-scope-roe`, `scope.txt`). iOS IPAs are a different
surface — treat them with the iOS assessment flow (`mobile-ios-assessment`). Typical jobs:
understand a thick client, audit a persistence item (LaunchAgent/Daemon), or analyze Apple-platform
malware.

## Why it works
Mach-O carries its trust model in-band: the code signature, entitlements, and load commands say
what the binary may do before you read a single instruction. Objective-C keeps class and selector
names in `__objc_*` sections and Swift symbols demangle to full signatures, so static recovery is
cheap — and Apple's own tools (`codesign`, `otool`, `lldb`, `log`) cover most of the workflow.