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email-security

Review suspicious emails for phishing and business email fraud by examining sender authentication, message content, links, and attachments. Organize indicators of compromise, which are traces of malicious activity, and recommend controls for the email environment.

OriginalShow the original description

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

See how to install

Good for

  • Investigating a suspected phishing email
  • Reviewing SPF, DKIM, and DMARC settings
  • Checking for business email fraud
  • Reviewing OAuth consent and mailbox token abuse

Files included (2)

  • SKILL.md1.5 KB
  • references/email-auth-checklist.md211 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

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

□ 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/nslookupSPF/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?

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