The Hull Beneath The Name

1. Challenge Overview

This challenge was about finding the real registered identity of a gray cargo vessel called "BRINE WALKER" at the pier.

The challenge description mentioned that the name painted on the stern looked shorter, and this hint was the key to the actual solution.

2. Objective

The flag had to be completed in the following format.

HTB{VESSELNAME_IMO_BERTH}

The required values were mainly these three:

• Actual registered vessel name
• IMO number
• Berth code

3. Tools Used

The tools actually used were the in-game UI tools.

• Harbor Ledger
• Registry Search
• Name History
• Oath Submission

4. Initial Clues

• Name used by the dock office: BRINE WALKER
• Cargo seal number clue: EC-4418
• The challenge description said the name on the stern looked shorter than BRINE WALKER.

5. Investigation Process

I checked the port records by searching for records related to the cargo seal number in the Harbor Ledger tool.

From this record, I confirmed the ledger vessel name, IMO, and berth.

Then I searched IMO 9384728 in Registry Search. The registry result showed that the current registered name was BRINEWALKER, along with the MMSI and callsign.

Finally, I opened Name History to confirm the difference between the former and current names. The former name was BRINE WALKER, while the current official registered name was BRINEWALKER without the space.

6. Confirmed Evidence

• Harbor Ledger vessel name: BRINEWALKER
• IMO: 9384728
• Berth: E-06
• Port call: EPA-2026-0717-044
• Customs reference: EC-4418
• MMSI: 257771420
• Callsign: LAVQ7
• Former name: BRINE WALKER
• Current official registered name: BRINEWALKER

7. Flag Assembly

The example flag used the berth format without a hyphen, like E01. Therefore, E-06 was converted to E06.

VESSELNAME = BRINEWALKER
IMO = 9384728
BERTH = E06

8. Flag

Confirmed flag:

HTB{BRINEWALKER_9384728_E06}

This write-up was originally written in Korean by human and translated into English with AI assistance.

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