~/challenges $ cat weekly/09_skeleton_key_at_stadtwerke.md
Active Directory Security / Cryptography
Hard
Live · Week 09
CHALLENGE #09 · Released 2 June 2026
Skeleton Key at Stadtwerke
REWARD +450 ptsBriefing
intel://sss/briefing_09.txt
INTELStadtwerke Oberzentrum, 03:14 local. A leak forum lights up. One line. The unmistakable signature of a Kerberos Ticket Granting Service reply, lifted from a domain that was supposed to be air-gapped.
The username says everything: svc-pumping-jh2. The service account that drives automated pressure overrides on every pump from the riverworks to the high tanks. Crack it and you own the physical grid.
A scraped wordlist surfaces alongside the leak — German industrial terms, facility codes, year stamps. The broker has done their homework, and they’re already running rules.
Operator, the adversary is mid-attack. Beat them to the password and pull the flag before the master payload compiles.
Objective
Crack the leaked
TGS-REP hash and submit the flag hidden in the cracked password.
Capture the Flag
Submit your solution · +450 pts on success
Format:
GRID-2026-XXXXOne submission per solve. Points post to the leaderboard on verify.