competition-dpapi-credential-chain

A specialist workflow for Capture the Flag (CTF) challenges involving Windows Data Protection API (DPAPI) secrets, such as browser credentials, vault data, and protected files.

In plain words
What is it for?
Use it after the main CTF sandbox workflow is active to trace DPAPI blobs, master keys, browser or vault stores, domain backup keys, and the shortest path from secret recovery to accepted access.
Why use it?
It helps connect an encrypted secret to the Windows user or machine context that can unlock it, then prove where the recovered value is accepted.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/2233admin/reverse-skill-evolver/competition-dpapi-credential-chain
Any agent
npx skills add 2233admin/reverse-skill-evolver --skill competition-dpapi-credential-chain
Clone the repo
git clone --depth 1 https://github.com/2233admin/reverse-skill-evolver

Made for: Claude Code, Codex.

Per session 116 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 696 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00116 $0.00696
Opus 5 $0.00058 $0.00348
Sonnet 5 $0.00023 $0.00139
Haiku 4.5 $0.00012 $0.00070

Measured 3d ago against content hash 029cf3988446, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

competition-dpapi-credential-chain scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to competition-dpapi-credential-chain — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CTF-Sandbox-Orchestrator/competition-dpapi-credential-chain/SKILL.md · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Competition Dpapi Credential Chain

Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.

Use this skill when the decisive Windows secret is DPAPI-protected and the hard part is proving which context unwraps it and where the plaintext is accepted.

Reply in Simplified Chinese unless the user explicitly requests English.

Quick Start

  1. Separate protected blob, masterkey, decrypting context, and final accepting service.
  2. Record SID, user or machine context, masterkey path, vault or browser store, and target replay point before broad conclusions.
  3. Keep DPAPI source artifact, unwrap step, plaintext secret, and acceptance edge in one chain.
  4. Distinguish local user DPAPI, machine DPAPI, domain backup key use, and application-specific wrapping.
  5. Reproduce the smallest DPAPI-to-accepted-access path that proves the decisive edge.

Workflow

1. Map Protected Secret And DPAPI Context

  • Record blob source, masterkey location, SID, protector scope, profile path, credential store, and any application wrapper such as browser encryption or vault metadata.
  • Note whether the decisive value lives in Credential Manager, Vault, browser cookies, browser passwords, Wi-Fi profiles, RDP files, or custom app storage.
  • Keep protected artifact, masterkey candidate, and account or machine context tied together.

2. Prove Unwrap And Acceptance

  • Show how the secret is decrypted: user logon material, machine context, domain backup key, or another recovered protector.
  • Record plaintext type, target host or service, replay method, and resulting session, token, or data access.
  • Distinguish successful blob decryption from actual accepted access.

3. Reduce To The Decisive DPAPI Chain

  • Compress the result to the smallest sequence: protected artifact -> masterkey or unwrap context -> plaintext secret -> accepted replay or access -> resulting capability.
  • State clearly whether the decisive edge lives in masterkey recovery, DPAPI scope confusion, application wrapper handling, or the service that accepts the recovered secret.
  • If the task broadens into generic LSASS ticket material or full Windows pivoting, hand back to the tighter host or pivot skill.

Read the full file on GitHub · 51 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 51 lines · 116 tokens per session scan A 029cf3988446

Subscribe to this mod's changes

competition-dpapi-credential-chain is a skill published in the GitHub repository 2233admin/reverse-skill-evolver (13 stars, last pushed 22d ago), licensed MIT. It adds 116 tokens to every session and 696 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to competition-dpapi-credential-chain, differing in 0 lines, and is treated as a copy.

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