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email-security SKILL.md skillA

email-security from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add novaestellar/novahaku/email-security@git:20260910.546fe86

Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: novaestellar/novahaku
Path: testing/email-security/SKILL.md
Versions recorded: 1
Latest version: git:20260910.546fe86, committed Sep 10, 2026
Size: 1,603 bytes
Repository stars: 28
License: MIT

Use for authorized email security review including phishing analysis, header authentication (SPF/DKIM/DMARC), BEC patterns, and mailbox token abuse research.

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

# Email Security & Phishing Analysis

## ACTION REQUIRED（读完后立刻执行）

1. `NOW`: 确认授权（分析样本邮件 / 租户配置评审）
2. `NOW`: 不向真实用户二次投递恶意样本
3. `ACT`: 头认证 → 内容/URL → 附件沙箱 → 租户控制面建议

## 适用场景

- 钓鱼邮件拆解与 IOC
- SPF/DKIM/DMARC 配置评估
- BEC 商务邮件欺诈模式
- OAuth 应用钓鱼 / 邮箱令牌滥用（联合 llm/cloud 身份）
- 安全意识演练设计（授权）

## 工作流

```text
□ 完整原始头：Received 链、From/Return-Path 一致性
□ SPF/DKIM/DMARC 对齐结果
□ URL 沙箱与附件静态（联合 malware-analysis）
□ 仿冒品牌与回复地址差异
□ 租户：反钓鱼策略、外部标记、MFA、OAuth app 同意
```

## 工具链

| 工具 | 用途 |
|------|------|
| 邮件客户端「查看源」 | 头 |
| dig/nslookup | SPF/DMARC 记录 |
| urlscan / 沙箱 | 链接与附件 |
| 租户管理中心 | 策略 |

## 参考

- `references/email-auth-checklist.md`
- `../malware-analysis/` `../attack-chain/`（钓鱼阶段） `../windows-ad/`（令牌）

## 路由上下文

**上游**: MASTER R36  
**MUST NOT**: 未授权对第三方域群发测试钓鱼

## 任务完成自检

- [ ] 头认证结论是否完整？
- [ ] IOC 是否可检测化（联合 threat-hunting）？
- [ ] Checklist？

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add novaestellar/novahaku/email-security@sha256:085bc72f45575e2d

The line at the top of this page pins the label git:20260910.546fe86, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_ow7dl3pi47mv5m57.svg)](https://markdownregistry.com/a/art_ow7dl3pi47mv5m57)

5 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 10, 2026.

version	committed	commit	size	audit
git:20260910.546fe86 latest	2026-09-10	546fe86	1,603 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (1603 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

GitHub

novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ow7dl3pi47mv5m57
GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/email-security
GET https://markdownregistry.com/api/v1/blob/085bc72f45575e2d534120bba50fdacd9d6062794def778f1f20b980dfb07610

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.

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