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Challenge Overview

As of 2026, the individual known as rain appears to have had an X (formerly Twitter) account. Investigators obtained a screenshot of a post, but the username was intentionally obscured by an overlay (appearing like a notepad or masking element).

The task is to identify the X account shown in the screenshot and determine the account’s screen name (ID).

Flag format:

SWIMMER{@account_name}

Example (not the solution):

SWIMMER{@gov_online}

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Initial Assumptions

Based on the provided screenshot and context, the following assumptions were made:

• The UI shown matches X / Twitter, based on layout and typography
• Even if the username is hidden, the post text itself may be searchable
• X allows searching for exact text strings, which can be used as an OSINT pivot
• The language used in the post suggests the account owner may be Japanese

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Investigation Process

1. Text Extraction from the Screenshot

Despite the username being hidden, the post content was fully visible in the screenshot. The readable Japanese text was:

これわりと近所だったから見に行ったな

This text became the primary OSINT pivot for identifying the account.

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2. Searching the Text on X

Since the interface appeared to be X, the next step was to perform a direct search on X using the extracted text.

By searching the exact Japanese sentence, the platform returned a small number of highly relevant results.

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3. Identifying the Original Poster

Among the search results, a post was found that matched the exact text shown in the screenshot, including formatting and context.

The account that posted the content was identified as:

@bruto_rain

Visual comparison between the search result and the original screenshot confirmed that the post originated from this account.

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Key Findings

• The obscured username could be bypassed by searching visible post text
• Exact-text searches on X are effective, especially for non-English content
• The Japanese sentence uniquely identified a single relevant account
• The account responsible for the post is @bruto_rain

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Final Flag / Answer

SWIMMER{@bruto_rain}

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Notes & Takeaways

• Text-based OSINT remains powerful even when usernames are intentionally hidden
• Screenshots often leak more information than intended through searchable content
• Non-English text can significantly reduce noise during social media investigations
• Platform-native search tools are often sufficient for attribution

This challenge highlights how content correlation alone can be enough to deanonymize social media posts using lawful OSINT techniques.