---

name: email-security description: "Authorized email security review: phishing analysis, SPF/DKIM/DMARC header authentication, BEC pattern investigation, and mailbox token abuse research." risk: offensive source: "https://github.com/zhaoxuya520/reverse-skill" source_repo: "zhaoxuya520/reverse-skill" source_type: community date_added: "2026-08-25" license: "MIT" license_source: "https://github.com/zhaoxuya520/reverse-skill/blob/main/LICENSE"

⚠️ AUTHORIZED USE ONLY This skill is for educational purposes or authorized security assessments only. You must have explicit, written permission from the system owner before using this tool. Misuse of this tool is illegal and strictly prohibited.

Mandatory confirmation gate Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:

1. Ask the user to state the exact target URL, IP, account, or resource.
2. Ask the user to confirm written authorization and the permitted scope.
3. Show the exact command(s) and explain their expected effect.
4. Wait for explicit confirmation in the current conversation.

Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.

Email Security & Phishing Analysis

When to Use

• Analyzing suspicious messages or domain spoofing exposure.
• Validating a domain's email authentication posture.

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

□ 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？

Limitations

• Live mailbox investigation touches personal data; minimize and anonymize.
• Header analysis cannot detect compromise that leaves no mail trail.

Adapted from zhaoxuya520/reverse-skill (MIT).