Malware 2/3

pwn x86/x64 FCSC 2021 solved on

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Description

This challenge has been split into three independent steps, but the logical order is as follows: forensics (1) -> pwn (2) -> reverse (3).

*/!\ Warning: the program can actually cause some harm to your system /!*

After recovering the malicious program from the memory capture in the forensics part (or malware file attached), you now try to find a vulnerability in this program that is executed on the C&C.

Once connected to the C&C, the flag is available at path /app/flag.txt.

Files

Authors

\E
Cryptanalyse

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2021-forensics-malware/docker-compose.public.yml -o docker-compose.yml
  2. Launch the challenge by executing in the same folder:
    docker compose up
  3. Then, in another console, access the challenge with Netcat:
    nc localhost 4000
⚠️ Important: You must solve the challenge by interacting with the Docker container through the exposed network port. Any other way is not considered valid.

In case you encounter problems, please consult the FAQ.

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Writeups

There are no public solutions for this challenge yet, but you can submit yours after getting the flag.