How to Prevent Runtime Changes With Runtime Bundle Validation Using AI
This Knowledge Base article describes how to use Appdome’s AI/ML in your CI/CD pipeline to continuously deliver plugins that Prevent Runtime Bundle Validation in Mobile apps.
What Is Runtime Bundle Validation?
Appdome Runtime Bundle Validation is a security measure that inspects all app files, configurations, and code assets during runtime to ensure they haven’t been tampered with or modified by attackers. This technique validates cryptographic signatures, hashes, or checksums of each file against expected values, making it effective for detecting unauthorized alterations across the entire app bundle. By inspecting all files, this feature guards against reverse engineering, repackaging attacks, and code injections that compromise app functionality and security.
Runtime bundle validation is critical for maintaining app integrity, as it prevents attackers from injecting malware, modifying logic, or disabling security features like licensing checks or in-app purchases. This comprehensive file inspection also aligns with regulatory standards and app store requirements for software integrity, helping developers meet compliance while protecting against piracy, fraud, and unauthorized modifications to critical app functions.
How Appdome Protects Mobile Apps With Runtime Bundle Validation?
Appdome’s dynamic Runtime Bundle Validation plugin performs checksum validation on every file in the app bundle. It cryptographically hashes files at build time and revalidates them at runtime, detecting unauthorized changes without causing false positives. The plugin also accounts for modifications made by Google and Apple during publishing, ensuring accurate detection. By preventing malicious app alterations, it secures apps against trojanization and runtime tampering.
Prerequisites for Using Appdome's Runtime Bundle Validation Plugins:
To use Appdome’s mobile app security build system to Prevent Runtime Bundle Validation , you’ll need:
- Appdome account (create a free Appdome account here)
- A license for Runtime Bundle Validation
- Mobile App (.ipa for iOS, or .apk or .aab for Android)
- Signing Credentials (see Signing Secure Android apps and Signing Secure iOS apps)
How to Implement Prevent Runtime Bundle Validation in Mobile Apps Using Appdome
On Appdome, follow these 3 simple steps to create self-defending Mobile Apps that Prevent Runtime Bundle Validation without an SDK or gateway:
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Designate the Mobile App to be protected.
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Upload an app via the Appdome Mobile Defense platform GUI or via Appdome’s DEV-API or CI/CD Plugins.
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Mobile App Formats: .ipa for iOS, or .apk or .aab for Android
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Runtime Bundle Validation is compatible with: Obj-C, Java, JS, C#, C++, Swift, Kotlin, Flutter, React Native, Unity, Xamarin, and more.
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Select the defense: Runtime Bundle Validation.
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Follow the steps in Sections 2.2-2.2.2 of this article to add the Runtime Bundle Validation feature to your Fusion Set via the Appdome Console.
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When you select the Runtime Bundle Validation you'll notice that the Fusion Set you created in step 2.1 now bears the icon of the protection category that contains Runtime Bundle Validation.
Figure 2: Fusion Set that displays the newly added Runtime Bundle Validation protection
Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory). -
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):
Figure 3: Fusion Set Detail Summary
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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:
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Refer to the Appdome API Reference Guide for API building instructions.
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Look for sample APIs in Appdome’s GitHub Repository.
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Create and name the Fusion Set (security template) that will contain the Runtime Bundle Validation feature as shown below:Figure 1: Fusion Set that will contain the Runtime Bundle Validation feature
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Add the Runtime Bundle Validation feature to your security template.
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Navigate to Build > Anti Fraud tab > Mobile Cheat Prevention section in the Appdome Console.
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Toggle OnRuntime Bundle Validation.
(a) Choose to monitor this attack vector by checking the Threat Events checkbox associated with Runtime Bundle Validation as shown below.
(b) To receive mobile Threat Monitoring, check the ThreatScope™ box as shown below. For more details, see our knowledge base article on ThreatScope™ Mobile XDR.Figure 4: Selecting Prevent Runtime Bundle Validation
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. -
Select the Threat-Event™ in-app mobile Threat Defense and Intelligence policy for Runtime Bundle Validation:
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Threat-Events™ OFF > In-App Defense
If the Threat-Events™ setting is not selected. Appdome will detect and defend the user and app by enforcing Runtime Bundle Validation.
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Threat-Events™ ON > In-App Detection
When this setting is used, Appdome detects runtime changes and passes Appdome’s Threat-Event™ attack intelligence to the app’s business logic for processing, enforcement, and user notification. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ to Prevent Runtime Bundle Validation Intelligence and Control in Mobile Apps.
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Threat-Events™ ON > In-App Defense
When this setting is used, Appdome detects and defends against Runtime Bundle Validation (same as Appdome Enforce) and passes Appdome’s Threat-Event™ attack intelligence to the app’s business logic for processing. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ for Prevent Runtime Bundle Validation Intelligence and Control in Mobile Apps.
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Configure the User Experience Options for Runtime Bundle Validation:
With Threat-Events™ OFF, Appdome provides several user experience options for mobile brands and developers.- 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.
- Short message Option. This is available for mobile devices that allow a banner notification for security events.
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Localized Message Option. Allows Appdome users to support global languages in security notifications.
Figure 5: Default User Experience Options for Appdome’s Runtime Bundle Validation
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Runtime Bundle Validation Threat Code™. Appdome uses AI/ML to generate a unique code each time Runtime Bundle Validation 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.
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Congratulations! The Runtime Bundle Validation protection is now added to the mobile app -
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Certify the Runtime Bundle Validation feature in Mobile Apps
After building Runtime Bundle Validation, Appdome generates a Certified Secure™ certificate to guarantee that the Runtime Bundle Validation protection has been added and is protecting the app. To verify that the Runtime Bundle Validation protection has been added to the mobile app, locate the protection in the Certified Secure™ certificate as shown below:
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 Runtime Bundle Validation has been added to each Mobile app. Certified Secure provides instant and in-line DevSecOps compliance certification that Runtime Bundle Validation and other mobile app security features are in each build of the mobile app.
Using Threat-Events™ for Runtime Bundle Validation Intelligence and Control in Mobile Apps
Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when Runtime Bundle Validation is detected. To consume and use Threat-Events™ for Runtime Bundle Validation in Mobile Apps, use AddObserverForName in Notification Center, and the code samples for Threat-Events™ for Runtime Bundle Validation shown below.
The specifications and options for Threat-Events™ for Runtime Bundle Validation are:
Threat-Event™ Elements | Prevent Runtime Bundle Validation Method Detail |
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Appdome Feature Name | Runtime Bundle Validation |
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 | |
Visible in ThreatScope™ | |
Developer Parameters for Preventing Runtime Bundle Validation Threat-Event™ | |
Threat-Event NAME | RuntimeBundleValidationViolation |
Threat-Event DATA | reasonData |
Threat-Event CODE | reasonCode |
Threat-Event REF | 6904 |
Threat-Event SCORE | |
currentThreatEventScore | Current Threat-Event score |
threatEventsScore | Total Threat-events score |
Threat-Event Context Keys | |
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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. |
carrierPlmn | PLMN of the device. Only available for Android devices. |
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 |
carrierName | Carrier name of the current device. Only available for Android. |
updatedOSVersion | Is the OS version up to date |
deviceBrand | Brand of the device |
deviceBoard | Board of the device |
buildUser | Build user |
buildHost | Build host |
sdkVersion | Sdk version |
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), Mobile developers can get detailed attack intelligence and granular defense control in Mobile applications and create amazing user experiences for all mobile end users when Runtime Bundle Validation is detected.
The following is a code sample for native Mobile apps, which uses all values in the specification above for Runtime Bundle Validation:
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.
xxxxxxxxxx
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("RuntimeBundleValidationViolation");
BroadcastReceiver threatEventReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message"); // Message shown to the user
String reasonData = intent.getStringExtra("reasonData"); // Threat detection cause
String reasonCode = intent.getStringExtra("reasonCode"); // Event reason code
// Current threat event score
String currentThreatEventScore = intent.getStringExtra("currentThreatEventScore");
// Total threat events score
String threatEventsScore = intent.getStringExtra("threatEventsScore");
// Replace '<Context Key>' with your specific event context key
// String variable = intent.getStringExtra("<Context Key>");
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
}
};
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
registerReceiver(threatEventReceiver, intentFilter, Context.RECEIVER_NOT_EXPORTED);
} else {
registerReceiver(threatEventReceiver, intentFilter);
}
Using Appdome, there are no development or coding prerequisites to build secured Mobile Apps by using Runtime Bundle Validation. 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 Runtime Bundle Validation
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:
- Customizing, Configuring & Branding Secure Mobile Apps.
- Deploying/Publishing Secure mobile apps to Public or Private app stores.
- Releasing Secured Android & iOS Apps built on Appdome.
Related Articles:
Check out the following related KB articles:
How to Prevent App Signing by Unauthorized Developers
How to Prevent non-approved Android, iOS app store publishing
How to Prevent Code Tampering in Android & iOS Apps
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.