Mob psycho¶

Description¶

Can you handle APKs? Download the android apk here.

Hints¶

• Did you know you can unzip APK files?
• Now you have the whole host of shell tools for searching these files.

Solution¶

First I unzipped the file:

binwalk --extract mobpsycho.apk

then I looked for flag inside the extracted directory:

cd _mobpsycho.apk.extracted

find . -name 'flag*'
./res/color/flag.txt

inside the flag.txt was this encoded string: 7069636f4354467b6178386d433052553676655f4e5838356c346178386d436c5f62313132616535377d

looked like Hexadecimal to me, so I decided to convert it to ASCII using this site.

flag: picoCTF{ax8mC0RU6ve_NX85l4ax8mCl_b112ae57}