Xamarin.Android (Build fully native Android apps using C#)

Nobody has claimed this yet.

Consider writing capa rules for `Xamarin.Android` applications:

> Xamarin.Android exposes the complete Android SDK for .NET developers. Build fully native Android apps using C# or F# in Visual Studio.

([credit](https://learn.microsoft.com/en-us/xamarin/android/))

Developers can write cross-platform and platform-specific C# (Android, iOS) . Here, we should aim to target Android-specific C# implemented via [Mono.Android](https://learn.microsoft.com/en-us/dotnet/api/android?view=xamarin-android-sdk-13):

([credit](https://visualstudio.microsoft.com/xamarin/))

`Xamarin.Android` framework has been leveraged by malware authors:
- https://blog.cyble.com/2021/10/22/fake-voicemail-app-built-through-xamarin-platform-spreads-spyware/
- https://maldr0id.blogspot.com/2015/03/android-malware-goes-mono-net-and-lua.html

Quick hunt on VT finds:
- [f22974d0d7736ed5cf04102d42d9db5f1592463c137921c02595f382411fb595](https://www.virustotal.com/gui/file/f22974d0d7736ed5cf04102d42d9db5f1592463c137921c02595f382411fb595)

We already have some coverage on this sample:

Deliverables:
- understand [`Mono.Android`](https://learn.microsoft.com/en-us/dotnet/api/android?view=xamarin-android-sdk-13) SDK and its uses by malware authors
- develop capa rules based on this understanding

Start by reviewing the linked Mono.Android SDK documentation and the referenced malware reports, then inspect the existing coverage for the provided VirusTotal sample. Determine which Android-specific C# or Mono.Android behaviors are not covered; done means adding capa rules based on that understanding and checking them against the sample.

Written by the indexing model from the issue text.