What is mobile-audit?

A security review for iOS and Android apps, covering their code, compiled app files, runtime behaviour, and interactions with devices, servers, and other apps.

Use it to check an owned or authorised mobile app against OWASP MASVS and MASTG, including source review, compiled-binary analysis, and runtime testing.

It helps find weaknesses such as exposed stored data, unsafe encryption, insecure links, and poor protection against tampering before attackers can use them.

mobile-audit — Cursor rule for Cursor 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.

Clone the repo

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

Made for: Cursor.

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

Your own site

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

Per session 127 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,460 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	$0.00127	$0.02460
Opus 5	$0.00063	$0.01230
Sonnet 5	$0.00025	$0.00492
Haiku 4.5	$0.00013	$0.00246

Measured 10d ago against content hash da73c8842a5c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 10d 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.

adapters/cursor/mobile-audit.mdc · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 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 · 175 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.

10d ago First seen · 175 lines · 127 tokens per session scan A da73c8842a5c

Subscribe to this mod's changes

mobile-audit is a cursor rule published in the GitHub repository briiirussell/cybersecurity-skills (384 stars, last pushed 3mo ago), licensed MIT. It adds 127 tokens to every session and 2,460 once invoked, about $0.0006 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.

Mobile Security

mobile-audit

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

Mobile Audit — iOS & Android Application Security Review

Authorization Check

Audit Checklist — MASVS-STORAGE (Sensitive Data Storage)

What this file has done since we first saw it

Other cursor rules, from other repositories

nativescript

performance-optimization

webkit-browser

maestro-device-selection

cursorrules

gradle