~/challenges $ cat weekly/04_signal_in_the_dns.md
Network / Pattern Recognition
Difficulty: Medium
Live · Week 04
CHALLENGE #04 · Released 28 Apr 2026
Signal in the DNS
REWARD +200 ptsBriefing
intel://sss/briefing_04.txt
INTELOur Security Special Service team captured a DNS query log from Spanish railway operator TransRail España. Most of it looks routine. One domain doesn’t.
Download the file below and start your investigation.
Objective
Find the
hidden data inside the provided file and submit it as your flag.
Evidence
Capture the Flag
Submit your solution · +200 pts on success
Format:
GRID-2026-XXXXOne submission per solve. Points post to the leaderboard on verify.