New Android Malware Uses NET MAUI to Evade Detection

Cybercriminals Exploit Microsoft’s Cross-Platform Framework

A new wave of Android malware is leveraging Microsoft’s .NET MAUI framework to disguise itself as legitimate applications, making it harder to detect and remove. McAfee’s Mobile Research Team, a member of the App Defense Alliance, discovered these sophisticated attacks, which primarily target users in China and India. However, the strategy could soon spread globally, affecting users in other regions.

.NET MAUI, launched by Microsoft in 2022, is a development framework that allows developers to build cross-platform applications using C. Unlike traditional Android apps written in Java or Kotlin, .NET MAUI-based apps store their logic inside binary blob files rather than the typical DEX format. Because security tools primarily scan DEX files, attackers can hide malicious code inside blobs, effectively bypassing detection.

McAfee observed that these malware campaigns use additional evasion techniques such as multi-layered encryption (XOR + AES), staged execution, and command-and-control (C2) communication via TCP sockets. The researchers warn that the presence of multiple malware variants using the same methods suggests this tactic is becoming increasingly common.

Fake Apps Used to Steal Personal Data

Attackers are deploying fake banking, communication, dating, and social media apps to distribute this malware. Examples include counterfeit versions of IndusInd, an Indian banking app, and SNS, a Chinese social networking app. These apps, primarily distributed through third-party stores outside of Google Play, aim to steal personal and financial information.

The fake IndusInd app tricks users into entering sensitive banking details, which are then transmitted to a C2 server.
The SNS app targets Chinese-speaking users, stealing SMS messages, contact lists, and stored photos.

Protecting Yourself from .NET MAUI Malware

To minimize the risk of infection:

Avoid downloading APKs from third-party stores or unverified websites.
Do not click on links received via SMS or email from unknown sources.
If Google Play is unavailable in your region, scan APK files for malicious behavior before installation.
Enable Google Play Protect, which can detect and block the identified malware variants.

What Undercode Says:

1. The Rise of .NET MAUI in Cybercrime

The use of .NET MAUI represents a strategic shift in Android malware development. Cybercriminals are adapting to security measures by using frameworks that are not traditionally associated with Android development. This highlights the evolving nature of mobile threats and the need for advanced security mechanisms.

2. Why This Tactic Works

Security tools rely on established patterns to detect threats. Since most Android security solutions focus on scanning DEX files, the of binary blob files in .NET MAUI-based apps creates a blind spot. Additionally, the use of multi-layered encryption ensures that even if parts of the malware are detected, understanding its full functionality becomes more challenging.

3. Implications for the Android Ecosystem

The discovery of this technique raises concerns about the future of Android malware. If cybercriminals continue to exploit .NET MAUI, security tools will need to adapt quickly. Furthermore, third-party app stores remain a significant vulnerability, especially in regions where Google Play is restricted.

4. The Role of Alternative App Stores

Countries like China, where Google Play is restricted, are especially vulnerable. Third-party app

References:

Reported By: https://www.bleepingcomputer.com/news/security/new-android-malware-uses-microsofts-net-maui-to-evade-detection/
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