Don't Overreact

Write-up author: jon-brandy

DESCRIPTION:

Some web developers wrote this fancy new app! It's really cool, isn't it?

HINT:

NONE

STEPS:

First, unzip the .zip file given.

RESULT

To reverse engineer APK file, i used apktool.

COMMAND -> `apktool d app-release.apk`

RESULT

Jump to the folder.

RESULT

Let's check the assets directory.

INSIDE

Check the file type.

RESULT

Try to combine strings with grep to find the flag prefix.

RESULT

Didn't find it, but a string caught my attention.

SFRCezIzbTQxbl9jNDFtXzRuZF9kMG43XzB2MzIyMzRjN30=

Looks like a base64 encoded text.
Decode it.

RESULT

Got the flag!

FLAG

HTB{23m41n_c41m_4nd_d0n7_0v32234c7}