subdomain-takeover SKILL.md skillA
subdomain-takeover from hellodqy/mastermind-bug-bounty is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hellodqy/mastermind-bug-bounty/subdomain-takeover@git:20260915.d2c52f2Pins git:20260915.d2c52f2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hellodqy/mastermind-bug-bounty
- Path
skills/subdomain_takeover/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260915.d2c52f2, committed Sep 15, 2026
- Size
- 1,434 bytes
- Repository stars
- 14
- License
- none declared
Verify dangling DNS delegations and deprovisioned third-party bindings when a scoped subdomain may be claimable and create a trusted-origin impact.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Subdomain Takeover ## Goal 沿完整 DNS 链确认目标子域是否指向已释放且可重新绑定的资源，并在不实际抢占生产名称的前提下证明可接管性与业务影响。 ## Tools / Inputs - 作用域内子域、DNS CNAME/NS/MX 链、HTTP/TLS 指纹、云服务归属和历史记录 - 资源索引：`references/INDEX.md`；候选资源：`subdomain-takeover-testing.md`、`cloud-attack-surface.md` ## Constraints 1. CNAME、NXDOMAIN 或供应商错误页单独都不构成确认。 2. 默认不注册、绑定或接管第三方资源；优先使用非占用式证据。 3. 必须验证供应商仍允许该精确名称或自定义域绑定。 4. 分离 CNAME、子区 NS、MX 和弹性 IP 等不同信任边界。 5. 影响评估只使用已观察到的 cookie、OAuth、CSP、邮件或可信域关系。 ## Chain Questions - DNS 链最终指向谁，资源是未配置、已删除还是仅不可公开访问？ - 供应商有哪些所有权验证、保留名称或域名验证机制？ - 是否存在二阶 CNAME、子区 NS 或邮件委派？ - 可接管域是否真实处于 cookie、OAuth、CSP、邮件或品牌信任链中？
Read the whole file at its exact version.
How to install
mdr add hellodqy/mastermind-bug-bounty/subdomain-takeover@sha256:2264760a6e8ee599The line at the top of this page pins the label git:20260915.d2c52f2, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_zq3sooplb2ar36l7)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 15, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1434 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
hellodqy/mastermind-bug-bounty · 14 stars · license none declared · pushed 2026-09-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zq3sooplb2ar36l7 GET https://markdownregistry.com/api/v1/resolve?ref=hellodqy/mastermind-bug-bounty/subdomain-takeover GET https://markdownregistry.com/api/v1/blob/2264760a6e8ee599d373095b1232dbcfdbdf5a3f388355187a676ad5e4bc3017
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.