Prevent Accessibility Service Malware on Android Apps
Learn to Prevent Accessibility Service Malware in Android apps, in mobile CI/CD with a Data-Driven DevSecOps™ build system.
What is Accessibility Service Malware?
Accessibility Service Malware is a program that uses Android Accessibility Services to perform malicious activities.
AccessibilityServices are OS settings/features in Android, such as screen readers and touch events, which are designed to help users with disabilities. These features run in the background and receive callbacks from the system when accessibility events are fired, allowing them to respond to a state transition in the UI (for example: focus has changed, a button has been clicked, or content in the active window has been queried).
Accessibility Service Malware suites take advantage of these permissions; for example, when an unsuspecting user enters his or her credentials into a banking app, the malware uses the keylogging feature to record those credentials. Once the malware has the credentials it can proceed to perform financial transactions that are only allowed with the recipient’s identifier such as an email address or a phone number. For these reasons, you are strongly recommended to prevent any use of the Accessibility Services by a malicious app and to protect the target application (your app) from being hijacked or compromised.
How does Appdome Prevent an Accessibility Service Malware Attack?
Appdome’s Prevent Accessibility Service Malware feature provides a comprehensive set of protections and tools for defending against various attacks while minimizing the impact on your ongoing operation.
This feature caters to the needs of organizations with mixed environments, by protecting against various types of malware suites, which attack older and current versions of Android.
Enabling Appdome’s Prevent Accessibility Service Malware feature automatically enables blocking banking malware apps (ATS malware) detecting Cloak & Dagger attacks. In addition, you can detect the use of permissions typically accessed by malware on Android 8 and earlier versions. All this while compiling a whitelist of trusted accessibility services, whose use will not be monitored and will not trigger alarms and events.
Prerequisites for Using Prevent Accessibility Service Malware:
To use Appdome’s mobile app security build system to Prevent Accessibility Service Malware , you’ll need:
- Appdome account (create a free Appdome account here)
- A license for Prevent Accessibility Service Malware
- Mobile App (.apk or .aab for Android)
- Signing Credentials (see Signing Secure Android apps and Signing Secure iOS apps)
Prevent Accessibility Service Malware on Android apps using Appdome
On Appdome, follow these 3 simple steps to create self-defending Android Apps that Prevent Accessibility Service Malware without an SDK or gateway:
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Upload the Mobile App to Appdome.
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Upload an app to Appdome’s Mobile App Security Build System
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Upload Method: Appdome Console or DEV-API
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Android Formats: .apk or .aab
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Prevent Accessibility Service Malware Compatible With: Java, JS, C++, C#, Kotlin, Flutter, React Native, Unity, Xamarin, Cordova and other Android apps
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Build the feature: Prevent Accessibility Service Malware.
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Building Prevent Accessibility Service Malware by using Appdome’s DEV-API:
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Create and name the Fusion Set (security template) that will contain the Prevent Accessibility Service Malware feature as shown below:
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Follow the steps in Sections 2.2.1-2.2.2 of this article, Building the Prevent Accessibility Service Malware feature via Appdome Console, to add the Prevent Accessibility Service Malware feature to this Fusion Set.
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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 2: Fusion Set Detail Summary
Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory). -
Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, App Center, Jenkins, Travis, Team City, Circle CI or other system:
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Build an API for the app – for instructions, see the tasks under Appdome API Reference Guide
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Look for sample APIs in Appdome’s GitHub Repository
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Figure 1: Fusion Set that will contain the Prevent Accessibility Service Malware feature
Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required). -
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Building the Prevent Accessibility Service Malware feature via Appdome Console
To build the Prevent Accessibility Service Malware protection by using Appdome Console, follow the instructions below.
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Where: Inside the Appdome Console, go to Build > Anti Fraud Tab > Mobile Malware Prevention section.
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How: Check whether is toggled On (enabled), otherwise enable it . The feature Prevent Accessibility Service Malware is enabled by default, as shown below. Toggle (turn ON) Prevent Accessibility Service Malware, as shown below.
If needed, Customize the Threat Notification to be displayed to the mobile end-user in a standard OS dialog notification when Appdome Prevents Accessibility Service Malware.Figure 3: Prevent Accessibility Service Malware option
Note: The App Compromise Notification contains an easy to follow default remediation path for the mobile app end user. You can customize this message as required to achieve brand specific support, workflow or other messaging. -
When you select the Prevent Accessibility Service Malware you'll notice that your Fusion Set you created in step 2.1.1 now bears the icon of the protection category that contains Prevent Accessibility Service Malware
Figure 4: Fusion Set that displays the newly added Prevent Accessibility Service Malware protection
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Select the Threat-Event™ in-app mobile Threat Defense and Intelligence policy for Prevent Accessibility Service Malware:
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Threat-Events™ OFF > In-App Defense
If the Threat-Events™ setting is cleared (not selected). Appdome will detect and defend the user and app by enforcing Prevent Accessibility Service Malware.
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Threat-Events™ ON > In-App Detection
When this setting is used, Appdome detects abusive accessibility services 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™ for Prevent Accessibility Service Malware 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 Accessibility Service Malware (same as Appdome Enforce) and passes Appdome’s Threat-Event™ attack intelligence 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 Accessibility Service Malware Intelligence and Control in Mobile Apps.
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- Extra Configuration with Prevent Accessibility Service Malware:
- User Accessibility Service Consent
Displays a message prompting the user to consent to allow the relevant accessibility services to track, use, modify, and perform gestures for you in this app. See https://www.appdome.com/how-to/mobile-malware-prevention/malware-controls/user-accessibility-service-consent/
- Set Trusted Accessibility Services
Allows user to identify trusted Accessibility Services by package or service name. When only trusted accessibility services are running, no enforcements are triggered, and app usage will not be affected. See https://www.appdome.com/how-to/mobile-fraud-prevention/anti-spyware-android-ios/allow-android-accessibilityservice-for-approved-apps/
- Trust OS Default Accessibility Services
Allows Android default list of accessibility services (e.g. Google VoiceAccess) to run as trusted services. See https://www.appdome.com/how-to/mobile-malware-prevention/malware-controls/trust-os-default-accessibility-services/
- Accessibility Service Abuse
Detect abuse of Accessibility Services by permissions typically used by malware on Android 8 and earlier, including visibility on all running apps, using overlays, and intercepting SMS messages. See https://www.appdome.com/how-to/mobile-malware-prevention/malware-controls/accessibility-service-abuse/
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Click Build My App at the bottom of the Build Workflow (shown in Figure 3).
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Congratulations! The Prevent Accessibility Service Malware protection is now added to the mobile app -
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Certify the Prevent Accessibility Service Malware feature in Android Apps
After building Prevent Accessibility Service Malware, Appdome generates a Certified Secure™ certificate to guarantee that the Prevent Accessibility Service Malware protection has been added and is protecting the app. To verify that the Prevent Accessibility Service Malware protection has been added to the mobile app, locate the protection in the Certified Secure™ certificate as shown below:
Figure 5: 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 Prevent Accessibility Service Malware has been added to each Android app. Certified Secure provides instant and in-line DevSecOps compliance certification that Prevent Accessibility Service Malware and other mobile app security features are in each build of the mobile app
Using Threat-Events™ for Accessibility Service Malware Intelligence and Control in Android Apps
Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when Accessibility Service Malware is detected. To consume and use Threat-Events™ for Accessibility Service Malware in Android Apps, use registerReceiver in the Application OnCreate, and the code samples for Threat-Events™ for Accessibility Service Malware shown below.
The specifications and options for Threat-Events™ for Accessibility Service Malware are:
Threat-Event™ Elements | Prevent Accessibility Service Malware Method Detail |
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Appdome Feature Name | Prevent Accessibility Service Malware |
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 Accessibility Service Malware Threat-Event™ | |
Threat-Event NAME | ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED |
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 | |
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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), Android developers can get detailed attack intelligence and granular defense control in Android applications and create amazing user experiences for all mobile end users when Accessibility Service Malware is detected.
The following is a code sample for native Android apps, which uses all values in the specification above for Prevent Accessibility Service Malware:
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.
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IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED");
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);
}
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val intentFilter = IntentFilter()
intentFilter.addAction("ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED")
val threatEventReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
var message = intent?.getStringExtra("message") // Message shown to the user
var reasonData = intent?.getStringExtra("reasonData") // Threat detection cause
var reasonCode = intent?.getStringExtra("reasonCode") // Event reason code
// Current threat event score
var currentThreatEventScore = intent?.getStringExtra("currentThreatEventScore")
// Total threat events score
var threatEventsScore = intent?.getStringExtra("threatEventsScore")
// Replace '<Context Key>' with your specific event context key
// var 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)
}
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const { ADDevEvents } = NativeModules;
const aDDevEvents = new NativeEventEmitter(ADDevEvents);
function registerToDevEvent(action, callback) {
NativeModules.ADDevEvents.registerForDevEvent(action);
aDDevEvents.addListener(action, callback);
}
export function registerToAllEvents() {
registerToDevEvent(
"ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED",
(userinfo) => Alert.alert(JSON.stringify(userinfo))
var message = userinfo["message"] // Message shown to the user
var reasonData = userinfo["reasonData"] // Threat detection cause
var reasonCode = userinfo["reasonCode"] // Event reason code
// Current threat event score
var currentThreatEventScore = userinfo["currentThreatEventScore"]
// Total threat events score
var threatEventsScore = userinfo["threatEventsScore"]
// Replace '<Context Key>' with your specific event context key
// var variable = userinfo["<Context Key>"]
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
);
}
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RegisterReceiver(new ThreatEventReceiver(), new IntentFilter("ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED"));
class ThreatEventReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
// Message shown to the user
String message = intent.GetStringExtra("message");
// Threat detection cause
String reasonData = intent.GetStringExtra("reasonData");
// Event reason code
String reasonCode = intent.GetStringExtra("reasonCode");
// 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...)
}
}
x
NSNotificationCenter.DefaultCenter.AddObserver(
(NSString)"ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED", // Threat-Event Identifier
delegate (NSNotification notification)
{
// Message shown to the user
var message = notification.UserInfo.ObjectForKey("message");
// Threat detection cause
var reasonData = notification.UserInfo.ObjectForKey("reasonData");
// Event reason code
var reasonCode = notification.UserInfo.ObjectForKey("reasonCode");
// Current threat event score
var currentThreatEventScore = notification.UserInfo.ObjectForKey("currentThreatEventScore");
// Total threat events score
var threatEventsScore = notification.UserInfo.ObjectForKey("threatEventsScore");
// Replace '<Context Key>' with your specific event context key
// var variable = notification.UserInfo.ObjectForKey("<Context Keys>");
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
}
);
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window.broadcaster.addEventListener("ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED", function(userInfo) {
var message = userInfo.message // Message shown to the user
var reasonData = userInfo.reasonData // Threat detection cause
var reasonCode = userInfo.reasonCode // Event reason code
// Current threat event score
var currentThreatEventScore = userInfo.currentThreatEventScore
// Total threat events score
var threatEventsScore = userInfo.threatEventsScore
// Replace '<Context Key>' with your specific event context key
// var variable = userInfo.<Context Keys>
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
});
x
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class PlatformChannel extends StatefulWidget {
const PlatformChannel({super.key});
State<PlatformChannel> createState() => _PlatformChannelState();
}
class _PlatformChannelState extends State<PlatformChannel> {
// Replace with your EventChannel name
static const String _eventChannelName = "ABUSIVE_ACCESSIBILITY_SERVICE_DETECTED";
static const EventChannel _eventChannel = EventChannel(_eventChannelName);
void initState() {
super.initState();
_eventChannel.receiveBroadcastStream().listen(_onEvent, onError: _onError);
}
void _onEvent(Object? event) {
setState(() {
// Adapt this section based on your specific event data structure
var eventData = event as Map;
// Example: Accessing 'externalID' field from the event
var externalID = eventData['externalID'];
// Customize the rest of the fields based on your event structure
String message = eventData['message']; // Message shown to the user
String reasonData = eventData['reasonData']; // Threat detection cause
String reasonCode = eventData['reasonCode']; // Event reason code
// Current threat event score
String currentThreatEventScore = eventData['currentThreatEventScore'];
// Total threat events score
String threatEventsScore = eventData['threatEventsScore'];
// Replace '<Context Key>' with your specific event context key
// String variable = eventData['<Context Keys>'];
});
}
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
}
Using Appdome, there are no development or coding prerequisites to build secured Android Apps by using Prevent Accessibility Service Malware. 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 Prevent Accessibility Service Malware
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:
- Set Trusted Accessibility Services
- Accessibility Service Abuse
- User Accessibility Service Consent
- Detect Cloak & Dagger Attack
- Prevent ATS Malware
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.