Link : https://tryhackme.com/room/adventofcyber3

Difficulty : Easy

Category : OSINT

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You are the responding intelligence officer on the hunt for more information about the infamous "Grinch Enterprises" ransomware gang.

As a response to the recent ransomware activity from Grinch Enterprises, your team has managed to collect a sample ransomware note.

!!! ВАЖНЫЙ !!!

Ваши файлы были зашифрованы Гринчем. Мы используем самые современные технологии шифрования.

Чтобы получить доступ к своим файлам, обратитесь к оператору Grinch Enterprises.

Ваш личный идентификационный идентификатор: «b288b97e-665d-4105-a3b2-666da90db14b».

С оператором, назначенным для вашего дела, можно связаться как "GrinchWho31" на всех платформах.

!!! ВАЖНЫЙ !!!

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The first step is to translate this note :

Traduction with DeepL

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✅ What is the operator's username ?

It is simply in the message translated above :

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✅ What social media platform is the username associated with ?

Just do a google search for the nickname, the answer is twitter :

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✅ What is the cryptographic identifier associated with the operator ?

The answer is in the one tweet written by GrinchWho31 :

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✅ What platform is the cryptographic identifier associated with ?

Same as the previous question, so the answer is keybase.io :

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✅ What is the bitcoin address of the operator ?

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✅ What platform does the operator leak the bitcoin address on ?

This platform is github, the profile is present on its profile keybase.io :

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✅ What is the operator's personal email ?

You need to inspect the second repo and look at this commit from November 16 :

Commit

We can therefore also answer the last question of the challenge !

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🕵🏼Author : https://twitter.com/mika_sec

➡️Pentester at : https://pegasy.co/