Кто такой Д.Г? (Who is D.G.?)

Platform: duckerz | Category: OSINT | Type: Challenge | Difficulty: Easy | OS: NA | Author: XESXOR | Date: 2026-02-11 | Status: Solved Techniques: comment-section-analysis, initials-decoding, literary-reference-identification, youtube-osint

Summary

Translation: "I lost my favorite book. Hailey concert #4 — that's all I remember about it. Help me find the book title in Latin script."

Кто такой Д.Г? (Who is D.G.?) — DUCKERZ CTF

Description

Я потерял свою любимую книгу. Hailey concert #4 - это всё, что я о ней помню. Помоги найти название книги на латинице. DUCKERZ{Название_Книги}

Translation: "I lost my favorite book. Hailey concert #4 — that's all I remember about it. Help me find the book title in Latin script."

Author: bazber
Solved by: 371 teams

Analysis

The task contains two key elements:

1. Task title: "Кто такой Д.Г.?" (Who is D.G.?) — a question with initials
2. Hint in description: "Hailey concert #4" — a specific phrase to search for ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

The task contains no files — this is pure OSINT where you need to find the connection between a YouTube video and a literary work.

Solution

Step 1: Searching for "Hailey concert #4"

The only concrete lead is the phrase "Hailey concert #4". Searching for this phrase on YouTube leads to a video:

URL:     https://www.youtube.com/watch?v=zQ6ou-mdNcs
Title:   Hailey concert #4
Author:  Jaime Dyba
Date:    February 2016
Content: Family video from a music performance

The video itself is an ordinary family recording of a concert with no obvious clues. The key information is hidden not in the video, but in its comments. ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

Step 2: Analyzing comments

In the comments section of this video, a phrase is discovered:

"Кто такой Джон Голт?"
(Who is John Galt?)

This is a direct connection to the task title.

Step 3: Decoding the initials Д.Г.

The task title "Кто такой Д.Г.?" is now revealed:

Д.Г. = Джон Голт (John Galt)
       ↑         ↑
       Д(жон)    Г(олт)

The initials Д and Г are the first letters of the name and surname John Galt in Russian transliteration.

Step 4: Identifying the book

‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

"Кто такой Джон Голт?" ("Who is John Galt?") is a famous leitmotif phrase from the novel:

┌──────────────────────────────────────────────────┐
│                                                  │
│   "Atlas Shrugged"                               │
│                                                  │
│   Author: Ayn Rand                               │
│   Year:   1957                                   │
│                                                  │
│   Opening line of the novel:                     │
│   "Who is John Galt?"                            │
│                                                  │
│   John Galt is a mysterious central character    │
│   whose name is repeated as a rhetorical         │
│   question throughout the entire book.           │
│                                                  │
└──────────────────────────────────────────────────┘

‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

The phrase "Who is John Galt?" is used in the novel as an expression of despair and resignation, as well as a mystery whose answer is revealed near the finale.

OSINT Methodology

Solution chain

"Hailey concert #4"
        │
        ▼
  YouTube video (zQ6ou-mdNcs)
        │
        ▼
  Comments → "Кто такой Джон Голт?"
        │
        ▼
  Д.Г. = Джон Голт = John Galt
        │
        ▼
  "Atlas Shrugged" (Ayn Rand, 1957)
        │
        ▼
  DUCKERZ{REDACTED}

Applied techniques

1. YouTube OSINT — searching for videos by exact title, analyzing metadata
2. Comment analysis — extracting information from the comments section, not from the content itself
3. Initials decoding — matching Russian initials Д.Г. with the full name John Galt
4. Literary reference identification — recognizing a famous quote and determining its source ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

Tools

Key indicators for solving

This technique should be applied when:

• The task contains a specific phrase that could be a title of content on YouTube/social media
• The task title contains initials or abbreviations requiring decoding
• The description indicates searching for a book/film/work
• The answer is hidden not in the content itself, but in metadata or comments ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

Lessons learned

1. Comments are part of the OSINT surface. In OSINT tasks, information can be hidden in video comments, not in the video itself. Always check the comments section.

2. The task title is a hint. "Кто такой Д.Г.?" is a direct mirror of the famous phrase "Who is John Galt?". Task titles in CTF often contain critically important hints.

3. Russian initials. In Russian-language CTFs, initials may be given in Cyrillic (Д.Г.), but decoded through transliteration (Джон Голт → John Galt). ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

4. Cultural erudition. Knowledge of classic literary works and their famous quotes is a useful skill for OSINT and misc tasks.

---

Solved: February 11, 2026
Author: Writeup Agent ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍