OOO archive --- DEF CON CTF [ login ]

dc2020q - mooodem reversing pwn

by mborgerson

This was a jeopardy challenge, part of dc2020q.

Points: 139
Was solved by: 33 teams

You may spawn the server:

On your laptop
  • Install docker
  • docker pull archiveooo/pub:mooodem (docker-saved download)
  • docker run -d --name mooodem archiveooo/pub:mooodem
  • Local IP: docker inspect mooodem -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}'
  • Connect to that IP:5000 — Remember to docker rm -f when done.
On your laptop (full source)
  • Install docker and pip install PyYAML coloredlogs
  • git clone
  • cd mooodem
  • ./spawner --log-level=INFO
  • Connect to the ip:port displayed
Hosted by OOO Right now we're asking players to login first.


Relive the good old days. Dust off your old Bell202 modems and dial in. (48kHz FP 8N1)


None yet :(
If you wish, you can contribute some.

There's an author-recommended writeup.


Spoilers ahead! Code for this challenge is publicly available.