---
case_id: CASE-2026-0004
scenario: phishing
alert_type: mail_suspicious_attachment
severity: medium
verdict: true_positive
source: soc-memory-poc
openviking_enriched: true
---

# CASE-2026-0004 Shared mailbox received OneDrive lure with HTML attachment

## 基本信息

- Case ID: CASE-2026-0004
- 标题: Shared mailbox received OneDrive lure with HTML attachment
- 告警类型: mail_suspicious_attachment
- 来源系统: SOC Memory POC Mock Dataset
- 时间范围: 待补充
- 研判人 / Agent: AI Agent Draft
- 最终结论: 真报
- 严重等级: medium

## 告警摘要

Shared finance mailbox received a fake OneDrive notification with an HTML attachment that led to credential collection.

## 关键实体

- 用户: shared-finance@corp.example
- 主机: 无
- 邮箱: shared-finance@corp.example
- IP: 198.51.100.87
- 域名: sharepoint-notify.com
- 文件 Hash: sha256:phish0004
- 其他 IOC: https://onedrive-review-login.example, noreply@sharepoint-notify.com

## 关键证据

- Attachment rendered a fake Microsoft sign-in page.
- Landing page hosted outside Microsoft IP space.
- Mail body reused branding from previous phishing campaign.

## 研判过程摘要

1. 确认告警场景与核心风险：Shared finance mailbox received a fake OneDrive notification with an HTML attachment that led to credential collection.
2. 提取关键证据并交叉验证：Attachment rendered a fake Microsoft sign-in page.
3. 对照关联 playbook / KB 复核告警模式与处置路径。
4. 基于关键证据与场景模式完成结论判定：真报。

## 结论依据

- 结论为真报。
- 最关键依据：Attachment rendered a fake Microsoft sign-in page.
- 补充依据：Landing page hosted outside Microsoft IP space.

## 处置建议

- 隔离相同主题、发件人或 URL 的邮件样本。
- 核查用户是否点击或提交凭据，并按需执行凭据重置。

## 可复用模式

- 命中模式: scenario:phishing, alert_type:mail_suspicious_attachment
- 误报特征: 无
- 需关注的变体: 相关标签：phishing, email, onedrive-lure

## 关联知识

- 关联 Playbook: [[PB-PHISH-001]]
- 关联 KB: [[KB-CRED-HARVEST-PATTERNS]]
- 关联历史 Case: [[CASE-2026-0001]], [[CASE-2026-0003]]
- 关联实体: [[shared-finance@corp.example]]

## 自动关联推荐

### 推荐历史 Case

- [[CASE-2026-0001]] (case score=0.675) This directory contains a structured case report detailing a high-severity phishing incident targeting a finance user via a malicious invoic...
- [[CASE-2026-0003]] (case score=0.606) This directory contains a structured incident report for a high-severity phishing attack involving executive impersonation, classified under...

### 推荐知识条目

- [[KB-CRED-HARVEST-PATTERNS]] (knowledge score=0.652) This directory contains a structured knowledge base artifact focused on identifying and investigating credential harvesting campaigns, parti...
- [[PB-PHISH-001]] (knowledge score=0.608) This directory contains a phishing email investigation playbook designed to standardize incident response procedures for suspicious emails, ...

## Lessons Learned

- 本案可沉淀为后续同类告警的快速判定参考。
- 若后续出现相同 lure、同类登录模式或相同关键证据，应优先联想本案与关联知识。

## 标签

- #case
- #scenario/phishing
- #alert/mail_suspicious_attachment
- #verdict/true-positive
- #phishing
- #email
- #onedrive-lure