Hook Detection

Hook detection identifies when a runtime hooking framework is intercepting or modifying your app's behavior, and lets you respond before it does damage.

iOS

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TL;DR

Hooking frameworks like Frida let an attacker intercept function calls, change return values, and rewrite behavior in a running app. Hook detection is a runtime self-protection that identifies when hooking is active, so your app can respond instead of trusting code that is being manipulated.

Definition

What is hook detection?

Hooking is a technique that intercepts calls in a running application and redirects or modifies them. Frameworks like Frida make it possible to change what a function returns, skip a check, or rewrite behavior without ever touching the app on disk.

For an attacker, hooking is one of the most powerful runtime tools. It can bypass a security check, manipulate a value, or extract data, all while the application appears to run normally.

Hook detection is a runtime, RASP-style protection that identifies when hooking frameworks are active in your application's process. Once it knows, your app can respond instead of trusting logic that is being intercepted.

Mechanism

How hook detection works

Hook detection looks for the traces hooking leaves behind:

Framework detection. The application looks for known hooking frameworks like Frida operating in its process.
Function integrity checks. It verifies that its own functions have not been redirected or modified in memory.
Behavioral checks. It looks for the runtime signs that calls are being intercepted.

When hooking is detected, the response is configurable: terminate, disable sensitive features, or alert your backend.

Example

Hook detection example

Your code ships unchanged. What an attacker with Frida can force inside it is what changes when hook detection is enabled.

Without hook detection

An attacker attaches Frida, hooks your license check, and forces it to return success. The app trusts the result and runs as if licensed.

With hook detection

The same attempt is detected, the app sees its function has been hooked, and it responds before the manipulated check is trusted.

Without hook detectionLicense.swift

func isLicensed(_ user: User) -> Bool {
    return server.verify(user.token)
}

With hook detectionLicense.swift

func isLicensed(_ user: User) -> Bool {
    return server.verify(user.token)
}

Use cases

When to use hook detection

Hook detection matters most when your application:

Has security checks an attacker would want to intercept and bypass.
Handles payments, licensing, or authentication.
Must resist runtime manipulation, not only static analysis.

It pairs with anti-debugging and jailbreak detection as a runtime hardening layer: together they defend against live manipulation of the app.

Platform availability

Hook detection and the iOS platform

iOS
Detection of runtime hooking frameworks such as Frida. On Android, equivalent runtime manipulation is covered by anti-debug, which detects Frida and Xposed.

Frequently asked questions

What is hook detection?

Hook detection is a runtime self-protection that identifies when a hooking framework like Frida is intercepting or modifying a running application, so the app can respond instead of trusting manipulated code.

Does hook detection affect performance?

The runtime cost is minimal. Hook detection checks run periodically and are lightweight.

What is hooking used for by attackers?

Hooking lets an attacker intercept function calls, change return values, and bypass security checks in a running app, all without modifying it on disk.

Can hook detection be bypassed?

Advanced attackers can attempt to evade detection, which is why it combines multiple signals and is layered with anti-debugging. The goal is to detect the common frameworks reliably.

Which platforms support hook detection?

ByteHide Shield provides hook detection for iOS. On Android, hooking frameworks are detected as part of anti-debug.