Aperi'Bot - Welcome

Aperi'CTF 2019 - MISC (50 pts).

Aperi’CTF 2019 - Aperi’Bot - Welcome

Challenge details

Event Challenge Category Points Solves
Aperi’CTF 2019 Aperi’Bot - Welcome MISC 50 26

Aperi’Bot is the welcome challenge of the Aperi’CTF event. It has been built to provide a simple test for Internet access, ensure that all teams are familiar with the platform and be fun 😊

Task description:

Welcome to the Aperi’CTF!

Check out Telegram and play with our @APRK_bot bot.

To authenticate yourself, send this command to the bot:

/auth zjny65fbxBmz2Q4G9e4vBQKT5fWuTnSUbW9PPgKa6hTuzpVPzjUa7FvsN5VAkMey

Note: If you don’t have a Telegram account and don’t want to create one, you can ask the staff for the flag.

Let the challenge begin!

Telegram bot

First, we need to checkout the APRK_bot using our Telegram account:

APRK_bot checkout

Let’s start a new conversation with the bot:

APRK_bot start

We’re given a set of command list that we can use to interact with the bot, let’s send ❤ to Aperi’Kube!

APRK_bot love

Okay, the bot seems to work properly, we should now be able to authenticate and get the flag!

APRK_bot flag

The bot wants to play a game, let’s play!


The game that the bot wants to play with us is the Rock, Paper, Scissors, Lizard, Spock which is a variant of the famous Rock, Paper, Scissors with the following rule:

  • Scissors cuts Paper
  • Paper covers Rock
  • Rock crushes Lizard
  • Lizard poisons Spock
  • Spock smashes Scissors
  • Scissors decapitates Lizard
  • Lizard eats Paper
  • Paper disproves Spock
  • Spock vaporizes Rock
  • Rock crushes Scissors

After several attempts to beat the bot, we finally get the flag:

APRK_bot rpsis

The final flag is APRK{W3lc0m3_t0_Ap3r1_CTF!!}

Happy Hacking!