What is mobile-audit?

A security review of iOS and Android applications using OWASP MASVS and MASTG, standards and testing guidance for mobile app security. It covers source code, compiled app files, and behavior while the app is running.

Use it to review a mobile app and its interactions with the device, backend, and other apps, including secure storage, deep links, and inter-process communication.

It helps find mobile-specific risks involving on-device storage, encryption, certificate checks, links, communication with other apps, and resistance to reverse engineering. Testing a binary requires ownership or written authorization and a controlled test environment.

mobile-audit — Skill for Claude Code by briiirussell

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 briiirussell/cybersecurity-skills --skill mobile-audit

Clone the repo

git clone --depth 1 https://github.com/briiirussell/cybersecurity-skills

Made for: Claude Code.

Or install cybersecurity-skills, the plugin that ships this one along with the rest of its 28 skills.

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/briiirussell/cybersecurity-skills/mobile-audit/github.svg)](https://agentmods.dev/skills/briiirussell/cybersecurity-skills/mobile-audit)

Your own site

<a href="https://agentmods.dev/skills/briiirussell/cybersecurity-skills/mobile-audit"><img src="https://agentmods.dev/badge/skills/briiirussell/cybersecurity-skills/mobile-audit/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/briiirussell/cybersecurity-skills/mobile-audit"><img src="https://agentmods.dev/badge/skills/briiirussell/cybersecurity-skills/mobile-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 131 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,475 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 4 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Privilege Escalation · line 54
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
high Privilege Escalation · line 55
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
high Privilege Escalation · line 77
Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
medium Rogue Agent · line 25
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

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	$0.00131	$0.02475
Opus 5	$0.00066	$0.01238
Sonnet 5	$0.00026	$0.00495
Haiku 4.5	$0.00013	$0.00248

Measured 12d ago against content hash cffb95c324f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

mobile-audit 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 12d 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/mobile-audit/SKILL.md · 176 lines

How it starts

The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mobile Audit — iOS & Android Application Security Review

Audit mobile apps against the OWASP Mobile Application Security Verification Standard (MASVS) and Mobile Application Security Testing Guide (MASTG). Covers source code review, static analysis of compiled binaries, and runtime testing.

Scope: this skill covers the app and its interaction with the device, the backend, and other apps. For backend API security, pair with api-audit. For dependency CVEs (CocoaPods, SPM, Gradle), pair with dependency-audit.

Authorization Check

Before reverse-engineering or runtime-testing a binary, confirm:

The app is yours, or you have written authorization from the publisher
You're operating in an environment you control (test device, emulator, dedicated sandbox)
App store ToS — Apple and Google generally allow security research on apps you own; testing competitor apps without authorization is a fast path to legal exposure

If unclear, ask before proceeding.

Audit Checklist — MASVS-STORAGE (Sensitive Data Storage)

iOS: keychain items use the strongest available kSecAttrAccessible class — kSecAttrAccessibleWhenUnlockedThisDeviceOnly or kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly. Avoid Always and ThisDeviceOnly-less variants
iOS: no secrets in NSUserDefaults, plist, or app bundle — strings <app>.ipa should not reveal API keys or secrets
Android: secrets in EncryptedSharedPreferences / Keystore-backed encrypted storage, not raw SharedPreferences
Android: android:allowBackup="false" in the manifest (or backup rules carefully scoped) — otherwise adb backup extracts everything
Both: no PII / tokens written to logs that survive a crash (NSLog, Log.d, third-party crash reporters)
Both: Pasteboard / Clipboard access — sensitive fields don't auto-share to system clipboard (iOS pasteboard.expirationDate, Android ClipDescription.EXTRA_IS_SENSITIVE)
Both: the OS app-switcher screenshot doesn't capture sensitive screens — iOS applicationDidEnterBackground blur, Android FLAG_SECURE on the activity

Read the full file on GitHub · 176 lines

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.

12d ago First seen · 176 lines · 131 tokens per session scan A cffb95c324f1

Subscribe to this mod's changes

mobile-audit is a skill published in the GitHub repository briiirussell/cybersecurity-skills (387 stars, last pushed 3mo ago), licensed MIT. It adds 131 tokens to every session and 2,475 once invoked, about $0.0007 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 2026-08-30.

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