This challenge presents a .txt file that contains:
<<-----UTF-8 MESSAGE BOD_30079 BEGINS---->>
Unicode is a computing industry standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems.
The system works in many languages. 该系统以许多语言工作. يعمل النظام في العديد من اللغات.
���� ���� �� �������� ��� ����� � ���� ��� ��
Το σύστημα λειτουργεί σε πολλές γλώσσες.Система работает на многих языках.
Steganography is the practice of concealing messages within other non-secret text or data.
The cover media may appear unremarkable at first glance and will require close investigation.
<<----UTF-8 MESSAGE BOD_30079 ENDS----->>
I am a lazy creature. I pasted the contents into Burp Community's Decoder. The flag appears:
H@T@B@{@t@r@1@t@h@3@m@1@u@5@_@1@4@9@9@}
Take out the @ symbols and you'll have the flag. HTB{tr1th3m1u5_1499}