What is macos-reverse?

A guide to authorized reverse engineering of macOS programs, Mach-O binaries, and app bundles. It covers signing, Objective-C and Swift code recovery, runtime behavior, and Apple security features.

Use it to inspect signatures and dependencies, recover code and symbols, trace runtime activity, and examine macOS malware.

It provides a structured way to understand how a macOS program is packaged, built, and behaves while investigating software or suspected malware.

macos-reverse — Skill for Claude Code and Codex by xAmirHamza77

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add xAmirHamza77/ReverseOps-Skill --skill macos-reverse

Clone the repo

git clone --depth 1 https://github.com/xAmirHamza77/ReverseOps-Skill

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/macos-reverse/github.svg)](https://agentmods.dev/skills/xamirhamza77/reverseops-skill/macos-reverse)

Your own site

<a href="https://agentmods.dev/skills/xamirhamza77/reverseops-skill/macos-reverse"><img src="https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/macos-reverse/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/xamirhamza77/reverseops-skill/macos-reverse"><img src="https://agentmods.dev/badge/skills/xamirhamza77/reverseops-skill/macos-reverse.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 525 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00035	$0.00525
Opus 5	$0.00017	$0.00262
Sonnet 5	$0.00007	$0.00105
Haiku 4.5	$0.00003	$0.00052

Measured 6d ago against content hash 1017f67cc5d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

macos-reverse scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/macos-reverse/SKILL.md · 75 lines

What it actually says

macOS / Mach-O Reverse Engineering

ACTION REQUIRED (execute immediately after reading)

NOW: Read ../field-journal/precedent-reverse.md
NOW: Confirm the target is macOS/Mach-O/App bundle (iOS IPA → mobile-reverse/)
NEXT: tool-index; jtool2/lldb, etc.
ACT: Signature and load information → static → dynamic (lldb/Frida)

Applicable scenarios

Mach-O executables / dylibs / frameworks
.app bundles, LaunchAgent/Daemon
Objective-C / Swift symbols and runtime
Notarization/signing, Hardened Runtime, TCC-related behavior analysis
macOS malware static/dynamic analysis (jointly with malware-analysis)

Workflow

1. Package and signature

file target
codesign -dv --verbose=4 target
spctl -a -vv target 2>&1
otool -L target

2. Static

□ class-dump / swift-demangle / Hopper / Ghidra / IDA
□ Strings and XPC service names, TCC-sensitive APIs
□ LC_LOAD_dylib dependencies and rpaths

3. Dynamic

□ lldb / Frida
□ Observe with fs_usage / log stream
□ Network: jointly with protocol-reverse or a proxy

Toolchain

Tool	Purpose
otool / nm / codesign	Built into the system
Hopper / Ghidra / IDA	Decompilation
class-dump / dsdump	ObjC
Frida / lldb	Dynamic
jtool2	Mach-O

References

references/macho-triage.md
../mobile-reverse/ (iOS) ../ghidra-reverse/ ../malware-analysis/

Routing context

Upstream: MASTER R31
Downstream: iOS → mobile-reverse; general samples → malware-analysis

Task completion self-check

Did I record the signature/Hardened Runtime status?
Are there address-level/symbol-level conclusions?
Checklist?

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/macho-triage.md 239 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

6d ago First seen · 75 lines · 35 tokens per session scan A 1017f67cc5d9

Subscribe to this mod's changes

macos-reverse is a skill published in the GitHub repository xAmirHamza77/ReverseOps-Skill (4 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 525 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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