Flash CTF - Dead Man's Bluff

Solution

Phase 1: Identifying the Aggressor (Fedresurs)

  1. Acquiring the OGRN: The prompt mentions a bankruptcy threat against "Тбанк". To search effectively on Russian legal registries, players first need the bank's unique corporate registration number (OGRN). By querying corporate databases like Rusprofile (https://www.rusprofile.ru/id/2431698) or similar websites, players can extract T-Bank's OGRN: 1027739642281. (Note: Accessing Rusprofile or other Russian governmental/corporate databases may require using a Russian VPN).
  2. The Starting Point: In Russia, legal intentions of bankruptcy must be publicly declared on the Federal Resource Registry (Fedresurs).
  3. The Search: Players navigate to fedresurs.ru and search using the newly acquired OGRN (1027739642281).
  4. The Pivot: By filtering the bank's historical timeline around February 2019, players will find a specific notice regarding the "Intention of a creditor to apply to court with a bankruptcy petition".
  5. Extraction: Reading this notice reveals the entity issuing the threat: a company named OOO "Unix-M" (ООО «Юникс-М»). Crucially, the notice provides Unix-M's unique Tax Identification Number (INN): 7816684943.

Phase 2: Entering the Court System (Kad.Arbitr)

  1. The Platform: Since the prompt states the company was sued by its own employee and went bankrupt, players must pivot to the official Russian Arbitration Court database: kad.arbitr.ru. (Note: A Russian VPN might also be required here).
  2. Querying the Entity: On the left-hand search panel under "Участник дела" (Case Participant), players input Unix-M's INN: 7816684943 and click "Найти" (Search).
  3. Locating the Correct Case: The search results will yield a few cases. Players need to look for a bankruptcy case, denoted by a red "Б" icon (Банкротные), filed against ООО "Юникс-М" as the defendant (Ответчик). This points directly to case number A56-64995/2019, filed by plaintiff Khrapochuk Olesya Nikolaevna.

Phase 3: Document Forensics and Flag Extraction

  1. Accessing the Dossier: Clicking on the case number A56-64995/2019 opens the electronic case file (Электронное дело).
  2. Finding the Final Decision: Players must scroll through the chronological list of court filings and locate the document titled "Решение" (Decision) dated 24.11.2019. This is the official ruling that finalized the bankruptcy.
  3. Document Translation & Analysis: Players download the PDF (indicated by a red 'A' PDF icon) and use tools like Yandex Translate, DeepL, or Google Translate to parse the text.
  4. Extracting Data Point 1 (The Debt): On page 1, the document states the reason for the lawsuit: non-payment of wages. The text explicitly lists the debt for November and December 2018 as 379 656 rubles.
  5. Extracting Data Point 2 (The Tax Freeze): On page 2, the judge confirms the company's financial operations ceased. The text specifies that operations on the debtor's accounts were suspended by FNS (Federal Tax Service) decisions starting from 28.03.2019.
  6. Flag Assembly: Combining the two extracted values into the requested format yields the final flag: SkillBit{379656_28-03-2019}.

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