## Opening APK in ADB and JADX

Given apk file. Open with JADX to view source code. Interesting functions pop out to me:


Need to somehow get CLICKS to over 99 million.. Thought I could make an autoclicker and let it run but if you look at `cookieViewClick` we can't get any higher than 13371337.

Open APK using adb to see how it works:

So autoclicker is out of the option, lets try to patch this apk and set the required cookies to a small number.

## Decompiling APK with APK_Tool and VSCode

Decompile apk using `apk_tool`

Open resulting folder in vscode and get ready to change some code
Open the entire directory and navigate to `\smali\example\clickme\MainActivity.smali`
Look for the hex value for that large value we saw earlier `5F5E0FF`
Edit that hex value to just 9. (or any value, just remember it)

Previous Function:

Changed Function:


Recompile apk using apktool:


## Signing New APK
### IMPORTANT!!!

You must sign the apk, v1 signing wasn't working for me so I jumped to V3
First create a key file:

Now sign the apk using apksigner:

Verify results:

## Load New APK Into ADB

Load APK file back into our ADB VM and click until you get to the number you changed in the smali file

## Flag
Click GET FLAG to see the flag:

Original writeup (https://nburns.tech/docs/CTFs/NahamCon_2022/Mobile/Click_me).