How to Detect Hooking Frameworks in iOS Apps

Last updated March 21, 2024 by Appdome

This Knowledge Base article describes how to use Appdome’s AI/ML in your CI/CD pipeline to continuously deliver plugins that Detect Hooking Frameworks in iOS apps.

What is Hooking?

A hook is a means of executing custom code (function) either before, after, or instead of existing code. For example, a function may be written to “hook” into the login process of a mobile application and alter the authentication workflow, by requesting users to enter their social security number or re-type their password. Fraudsters use dynamic instrumentation toolkits such as Frida to hook into the application, interact with the running processes, and inject their own JavaScript code, thus replacing the original code.

How Appdome Protects iOS Apps from Hooking Frameworks?

Appdome’s Detect Hooking Frameworks feature detects and prevents common hooking methods and frameworks that attempt to intercept function/method calls, messages, or API calls and then modify their instructions or output. Appdome also detects any code injected into the app’s process memory and prevents it from running.

Prerequisites for Using Appdome's Hooking Frameworks Plugins:

To use Appdome’s mobile app security build system to Detect Hooking Frameworks , you’ll need:

How to Implement Detect Hooking Frameworks in iOS Apps Using Appdome

On Appdome, follow these 3 simple steps to create self-defending iOS Apps that Detect Hooking Frameworks without an SDK or gateway:

  1. Designate the Mobile App to be protected.

    1. Upload an app via the Appdome Mobile Defense platform GUI or via Appdome’s DEV-API or CI/CD Plugins.

    2. iOS Formats: .ipa
    3. Hooking Frameworks is compatible with: Obj-C, Java, Swift, Flutter, React Native, Unity, Xamarin, Cordova and other iOS apps.
  2. Select the defense: Hooking Frameworks.

      1. Create and name the Fusion Set (security template) that will contain the Hooking Frameworks feature as shown below:
        fusion set that contains Hooking Frameworks

        Figure 1: Fusion Set that will contain the Hooking Frameworks feature

      2. Follow the steps in Sections 2.2-2.2.2 of this article to add the Hooking Frameworks feature to your Fusion Set via the Appdome Console.

      3. When you enable Prevent Code Injection you'll notice that the Fusion Set you created in step 2.1 now bears the icon of the protection category that contains Hooking Frameworks.

        Fusion Set applied Hooking Frameworks

        Figure 2: Fusion Set that displays the newly added Hooking Frameworks protection
        Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

      4. Open the Fusion Set Detail Summary by clicking the “...” symbol on the far-right corner of the Fusion Set. Copy the Fusion Set ID from the Fusion Set Detail Summary (as shown below): fusion Set Detail Summary image

        Figure 3: Fusion Set Detail Summary

      5. Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, Jenkins, Travis, Team City, Circle CI or other system:
        1. Refer to the Appdome API Reference Guide for API building instructions.
        2. Look for sample APIs in Appdome’s GitHub Repository.
    1. Add the Hooking Frameworks feature to your security template.

      1. Navigate to Build > Anti Fraud tab > Mobile Malware Prevention section in the Appdome Console.
      2. Toggle On Prevent Code Injection > Hooking Frameworks.
        Hooking Frameworks option

        Figure 4: Selecting Detect Hooking Frameworks

        Note: The Appdome Platform displays the Mobile Operation Systems supported by each defense in real-time. For more details, see our OS Support Policy KB.

      3. Configure the User Experience Options for Hooking Frameworks:
        With Threat-Events™ OFF, Appdome provides several user experience options for mobile brands and developers.
        1. App Compromise Notification: Customize the pop-up or toast Appdome uses to notify the user when a threat is present while using the protected mobile app.
        2. Short message Option. This is available for mobile devices that allow a banner notification for security events.
        3. Localized Message Option. Allows Appdome users to support global languages in security notifications.

          Localized Message

          Figure 5: Default User Experience Options for Appdome’s Hooking Frameworks

        4. Hooking Frameworks Threat Code™. Appdome uses AI/ML to generate a unique code each time Hooking Frameworks is triggered by an active threat on the mobile device. Use the code in Appdome Threat Resolution Center™ to help end users identify, find and resolve active threats on the personal mobile devices.
    2. Initiate the build command either by clicking Build My App at the bottom of the Build Workflow (shown in Figure 4) or via your CI/CD as described in Section 2.1.4.
    Congratulations!  The Hooking Frameworks protection is now added to the mobile app
  3. Certify the Hooking Frameworks feature in iOS Apps

    After building Hooking Frameworks, Appdome generates a Certified Secure™ certificate to guarantee that the Hooking Frameworks protection has been added and is protecting the app. To verify that the Hooking Frameworks protection has been added to the mobile app, locate the protection in the Certified Secure™ certificate as shown below: Hooking Frameworks shown in Certificate secure

    Figure 6: Certified Secure™ certificate

    Each Certified Secure™ certificate provides DevOps and DevSecOps organizations the entire workflow summary, audit trail of each build, and proof of protection that Hooking Frameworks has been added to each iOS app. Certified Secure provides instant and in-line DevSecOps compliance certification that Hooking Frameworks and other mobile app security features are in each build of the mobile app.

Using Threat-Events™ for Hooking Frameworks Intelligence and Control in iOS Apps

Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when Hooking Frameworks are detected. To consume and use Threat-Events™ for Hooking Frameworks in iOS Apps, use AddObserverForName in Notification Center, and the code samples for Threat-Events™ for Hooking Frameworks shown below.

The specifications and options for Threat-Events™ for Hooking Frameworks are:

Threat-Event™ Elements Detect Hooking Frameworks Method Detail
Appdome Feature Name Hooking Frameworks
Threat-Event Mode
OFF, IN-APP DEFENSE Appdome detects, defends and notifies user (standard OS dialog) using customizable messaging.
ON, IN-APP DETECTION Appdome detects the attack or threat and passes the event in a standard format to the app for processing (app chooses how and when to enforce).
ON, IN-APP DEFENSE Uses Appdome Enforce mode for any attack or threat and passes the event in a standard format to the app for processing (gather intel on attacks and threats without losing any protection).
Certified Secure™ Threat Event Check x
Visible in ThreatScope™ x
Developer Parameters for Detecting Hooking Frameworks Threat-Event™
Threat-Event NAME
Threat-Event DATA reasonData
Threat-Event CODE reasonCode
Threat-Event REF
Threat-Event SCORE
currentThreatEventScore Current Threat-Event score
threatEventsScore Total Threat-events score
Threat-Event Context Keys
message Message displayed for the user on event
failSafeEnforce Timed enforcement against the identified threat
externalID The external ID of the event which can be listened via Threat Events
osVersion OS version of the current device
deviceModel Current device model
deviceManufacturer The manufacturer of the current device
fusedAppToken The task ID of the Appdome fusion of the currently running app
kernelInfo Info about the kernel: system name, node name, release, version and machine.
deviceID Current device ID
reasonCode Reason code of the occurred event
buildDate Appdome fusion date of the current application
devicePlatform OS name of the current device
updatedOSVersion Is the OS version up to date
timeZone Time zone
deviceFaceDown Is the device face down
locationLong Location longitude conditioned by location permission
locationLat Location latitude conditioned by location permission
locationState Location state conditioned by location permission
wifiSsid Wifi SSID
wifiSsidPermissionStatus Wifi SSID permission status
threatCode The last six characters of the threat code specify the OS, allowing the Threat Resolution Center to address the attack on the affected device.

With Threat-Events™ enabled (turned ON), iOS developers can get detailed attack intelligence and granular defense control in iOS applications and create amazing user experiences for all mobile end users when Hooking Frameworks are detected.


The following is a code sample for native iOS apps, which uses all values in the specification above for Hooking Frameworks:


Important! Replace all placeholder instances of <Context Key> with the specific name of your threat event context key across all language examples. This is crucial to ensure your code functions correctly with the intended event data. For example, The <Context Key> could be the message, externalID, OS Version, reason code, etc.



Using Appdome, there are no development or coding prerequisites to build secured iOS Apps by using Hooking Frameworks. There is no SDK and no library to code or implement in the app and no gateway to deploy in your network. All protections are built into each app and the resulting app is self-defending and self-protecting.

Releasing and Publishing Mobile Apps with Hooking Frameworks

After successfully securing your app by using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include:

Related Articles:

How Do I Learn More?

If you have any questions, please send them our way at support.appdome.com or via the chat window on the Appdome platform.

Thank you!

Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project.

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