SWIMMER OSINT CTF 2026 – lilica_07_work

Challenge Overview

The goal of this challenge was to identify the nearest Tokyo Metro station to the workplace of the target, “Lilica”. We were provided with:

• Her X (Twitter) handle: @twilight_lilica
• Her real name: Shiharu Nanaogi
• A photo from her account
• Metadata from an .fbx file

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Initial Assumptions

• OSINT is key: Correlate her online identity with physical locations.
• Object Identification: Visual clues in the photo may indicate her employer.
• Strict Station Naming: Only a Tokyo Metro station should be selected; JR and private lines (like Tokyu) must be excluded.

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Investigation Process

Step 1: Analyzing the Image (The Physical Clue)

• Observed the image posted at a restaurant (identified as Denny’s based on aesthetics).
• Noticed a jacket draped over a chair.
• The label on the collar read “POLEWARDS”.

• Research revealed POLEWARDS is a brand owned and manufactured by Zanter Co., Ltd. (ザンター). Reference

Step 2: Analyzing Digital Footprints (The Profession)

• File path from her computer:

\Users\shiharu_nanaogi\Documents\modeling\vrc_test\hair_pin\simple_hair_pin.fbx

• Inference: She is a 3D Designer, creating VRChat assets.
• Website confirmation: twilight-lilica.com shows she is a Freelance Designer focusing on 3DCG.

• Connecting the dots: A 3D Designer with a POLEWARDS jacket likely works at Zanter Co., Ltd. (possibly in digital fashion/marketing).

Step 3: Geolocation of the Workplace

• Company: Zanter Co., Ltd.
• Address: Japan, 〒153-0042 Tokyo, Meguro City, Aobadai, 4 Chome−7−1 4F

Step 4: Determining the Station

• Candidate A: Ikejiri-Ohashi Station (~600m) — closest physically but Tokyu Den-en-toshi Line (rejected).

• Candidate B: Shibuya Station (~1.1km) — major hub, walking distance longer.

• Candidate C: Naka-meguro Station (~1.1km) — terminus of Tokyo Metro Hibiya Line, located in the same ward (Meguro-ku).

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Key Findings

• Target Brand: POLEWARDS (owned by Zanter)
• Workplace: Zanter Co., Ltd. Headquarters
• Location: Aobadai, Meguro-ku
• Nearest Metro Station: Naka-meguro Station (Hibiya Line)

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Final Flag / Answer

SWIMMER{中目黒}

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Notes & Takeaways

• Brand Reconnaissance: Clothing items and brands often provide direct links to the target’s employer.
• File Metadata: File paths, like vrc_test, reveal the type of designer she is.
• Train Line Specificity: In Japan-based CTFs, distinguish between JR, Private Railways (Tokyu, Odakyu), and Tokyo Metro. The nearest station must meet the line requirement, not just physical proximity.