How to Protect Android & iOS Apps from Keylogging Attacks

Last updated September 24, 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 Prevent Keylogging in Mobile apps.

What is Keylogging?

Keylogging, short for “keystroke logging”, is a type of cyberattack or surveillance technique where an unauthorized party captures and records the keystrokes made on a device keyboard by a user. This allows the attacker to capture sensitive information such as passwords, credit card numbers, personal messages and more.

Why Prevent Keylogging in Mobile Apps?

Preventing keylogging is an essential part of the data loss prevention (DLP) strategy. Blocking keyloggers means preventing keyloggers from capturing keystrokes and then passing that information to attackers.

Preventing keylogging in mobile apps is crucial because users might unknowingly use third-party keyboards that have malicious intentions. Even though keyboards are part of the device, The user has been lured into installing a 3rd party keyboard. However, if these keyboards are used for essential apps such as banking, this can cause a significant risk of passwords being stolen. This threat comes from keyloggers that are already present in these keyboards, further highlighting the need to protect user data and privacy.

Appdome’s Prevent Keylogging Attacks feature ensures app users’ private and valuable information remains protected and secure.

 

Special Note on iOS Keylogging Prevention:

For iOS, Appdome’s Keylogging Prevention is always enforced. This means that the text fields in the app are automatically protected, and any attempt to use a non-system keyboard will trigger iOS to revert to the system keyboard. Apple currently does not provide a method to detect which keyboard is being used; instead, it only allows the app to specify that a text field must use the system keyboard. There are no notifications to the user when this switch occurs, maintaining a seamless user experience.

Note: This example uses an Android app. However, you can apply the same protections to your iOS app by following the same setup process.

Prerequisites for Using Appdome's Keylogging Prevention Plugins:

To use Appdome’s mobile app security build system to Prevent Keylogging , you’ll need:

How to Implement Prevent Keylogging in Mobile Apps Using Appdome

On Appdome, follow these 3 simple steps to create self-defending Mobile Apps that Prevent Keylogging 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. Mobile App Formats: .ipa for iOS, or .apk or .aab for Android
    3. Keylogging Prevention is compatible with: Obj-C, Java, JS, C#, C++, Swift, Kotlin, Flutter, React Native, Unity, Xamarin, and more.
  2. Select the defense: Keylogging Prevention.

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

        Figure 1: Fusion Set that will contain the Keylogging Prevention feature
        Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required).

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

      3. When you select the Keylogging Prevention you'll notice that the Fusion Set you created in step 2.1 now bears the icon of the protection category that contains Keylogging Prevention.

        Fusion Set applied Keylogging Prevention

        Figure 2: Fusion Set that displays the newly added Keylogging Prevention 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 Keylogging Prevention feature to your security template.

      1. Navigate to Build > Anti Fraud tab > Mobile Fraud Detection section in the Appdome Console.
      2. Toggle On > Keylogging Prevention.

        (a) Choose to monitor this attack vector by checking the Threat Events checkbox associated with Keylogging Prevention 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.
        Keylogging Prevention option

        Figure 4: Selecting Prevent Keylogging

        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. Select the Threat-Event™ in-app mobile Threat Defense and Intelligence policy for Keylogging Prevention:
        1. 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 Keylogging.

        2. Threat-Events™ ON > In-App Detection

          When this setting is used, Appdome detects keylogging 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 Keylogging PreventionPrevent Intelligence and Control in Mobile Apps.

        3. Threat-Events™ ON > In-App Defense

          When this setting is used, Appdome detects and defends against Keylogging (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 Keylogging PreventionPrevent Intelligence and Control in Mobile Apps.

      4. Configure the User Experience Options for Keylogging Prevention:
        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 Keylogging

        4. Keylogging Prevention Threat Code™. Appdome uses AI/ML to generate a unique code each time Keylogging Prevention 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.
      5. Extra Configuration with Keylogging Prevention:
        1. Trust Built-In Keyboards

          Only allow access to the default OS built in keyboard.

        2. Trusted Custom Keyboards

          Add custom keyboards to trusted list. [Android only]

        3. Trust Custom Keyboards Only

          Limit use to only specified custom keyboards

        4. Accessibility Events Cloaking [Android only]

          Hide keyboard events from malicious keyloggers

    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 Keylogging Prevention protection is now added to the mobile app
  3. Certify the Keylogging Prevention feature in Mobile Apps

    After building Keylogging Prevention, Appdome generates a Certified Secure™ certificate to guarantee that the Keylogging Prevention protection has been added and is protecting the app. To verify that the Keylogging Prevention protection has been added to the mobile app, locate the protection in the Certified Secure™ certificate as shown below: Keylogging Prevention 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 Keylogging Prevention has been added to each Mobile app. Certified Secure provides instant and in-line DevSecOps compliance certification that Keylogging Prevention and other mobile app security features are in each build of the mobile app.

Using Threat-Events™ for Keylogging Intelligence and Control in Mobile Apps

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

The specifications and options for Threat-Events™ for Keylogging are:

Threat-Event™ Elements Prevent Keylogging Method Detail
Appdome Feature Name Keylogging Prevention
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 Keylogging Threat-Event™
Threat-Event NAME BlockedKeyboardEvent
Threat-Event DATA reasonData
Threat-Event CODE reasonCode
Threat-Event REF 6801
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.
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.
blocked Is the keyboard blocked
keyboard Keyboard name

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 Keylogging is detected.


The following is a code sample for native Mobile apps, which uses all values in the specification above for Keylogging Prevention:


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 Mobile Apps by using Keylogging Prevention. 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 Keylogging Prevention

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.

Want a Demo?

Mobile ATO Prevention

GilWe're here to help
We'll get back to you in 24 hours to schedule your demo.

Search Appdome Solutions

Search
Supercharge The Experience In Mobile App Defense

Supercharge the Experience in Mobile App Defense

Appdome revolutionizes mobile app defense by integrating security seamlessly, enhancing the user experience for developers, cyber teams, and end-users without disruption.

Better User Experience In Mobile Defense

Better User Experience in Mobile Defense

This blog show how Appdome’s Intelligent Defense helps mobile brands and users resolve threats with the user experience as a central priority.