---
title: "Using the Mach-O module in YARA-X"
url: https://daily.dev/posts/using-the-mach-o-module-in-yara-x-ksjaazson
source_url: https://virustotal.github.io/yara-x/blog/using-the-mach-o-module-in-yara-x
type: article
source: "YARA-X"
published: 2026-08-23T12:23:26.229Z
updated: 2026-08-23T12:59:13.862Z
tags: ["security", "malware", "reverse-engineering"]
reading_time: 4
upvotes: 0
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Using the Mach-O module in YARA-X

**[YARA-X](https://daily.dev/sources/yara-x)** · 4 min read · 0 upvotes · 0 comments

## Summary

YARA-X's new macho module simplifies detecting patterns in Mach-O binaries compared to the manual byte-matching required in original YARA. The post walks through using macho.symtab, macho.imports, macho.exports, rpaths, dylibs, and entitlements, along with helper functions like has_import(), has_export(), has_rpath(), has_dylib(), and has_entitlement(). It also explains the deduplicated, sorted, lowercased MD5 hashing scheme used for hash-based detections across these structures, pointing readers to the full documentation for more detail.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://virustotal.github.io/yara-x/blog/using-the-mach-o-module-in-yara-x>

## Questions this post answers

### How do I detect a specific dylib or import in a Mach-O binary using YARA-X?

Use the macho module's has_dylib() function to check for a specific shared library loaded via a load command, or has_import() to check for a specific imported symbol. The macho module also exposes arrays like macho.imports and dylib structures that can be iterated directly in a YARA-X rule for more granular matching.

_Developers building malware detection rules can find deep dives like this through daily.dev's tech feeds._

### How does YARA-X hash a list of entitlements or dylibs for detection purposes?

YARA-X computes an MD5 hash of the deduplicated, sorted, and lowercased entries joined by commas, such as md5("dylib_1,dylib_2,dylib_n"). This applies to categories like dylibs, imports, exports, and entitlements, allowing analysts to fingerprint a specific combination of Mach-O binary features with a single hash comparison.

_Security engineers comparing binary analysis techniques can track tooling changes like this via daily.dev._

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---

Tags: [#security](https://daily.dev/tags/security), [#malware](https://daily.dev/tags/malware), [#reverse-engineering](https://daily.dev/tags/reverse-engineering)

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