I recently posted a Tutorial about setting up Dendroid: https://null-byte.wonderhowto.com/how-to/setup-dendroid-android-rat-0167299/. I have worked the last 5 days on getting the Dendroid Binder, given with the Dendroid Source, working. This solution only works on Windows systems!
First you have to follow these instructions to get Apktool ready. Now you have to chose the Apk which u want to use for hiding your Dendroid RAT. Then use this command for decompiling the Dendroid Apk:
apktool.bat d <Path to your Dendroid Apk>
apktool.bat d F:\Dendroid.apk
And for your hiding Apk:
apktool.bat d <Path to your Hiding Apk>
Now navigate to your Users Directory for example C:\Users\Thogs And search for the 2 Folders named like your Decompiled Apks. In the Dendroid Folder Copy all Files of the Smali Folder into the Smali Folder of the Hiding Apk. If it asks for replacement click Ok. Then download my Dendroid Binder from here. Download Visual Basic http://www.chip.de/downloads/Visual-Basic-2010-Express_24082907.html (German Site, but download will work. If you get problems with the language search for another download). Now open Visual Basic and import the Project with File>open Project>(Your Dendroid Binder Path) and then select one of the project files. Now click the start button on top. The Tool should start, where you have to select the Folder of your modified Hiding Apk. Now click Button1!
You have just binded the 2 Apks in one Stealth Apk, which is located in the Hiding Folder>dist directory. After the victim has installed your Apk it has to reboot the Phone and then you should get a connection shown up on your Dendroid Webpanel. To get the victim rebooting the system is your social-engineering homework today ;)