---
case_id: CASE-2026-0002
scenario: phishing
alert_type: mail_suspicious_link
severity: medium
verdict: false_positive
source: soc-memory-poc
openviking_enriched: true
---

# CASE-2026-0002 Payroll notification email flagged but determined benign

## 基本信息

- Case ID: CASE-2026-0002
- 标题: Payroll notification email flagged but determined benign
- 告警类型: mail_suspicious_link
- 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: 误报
- 严重等级: medium

## 告警摘要

Payroll update email was flagged due to a shortened URL, but the destination was the approved HR vendor portal.

## 关键实体

- 用户: bob@corp.example
- 主机: HR-LAPTOP-03
- 邮箱: bob@corp.example
- IP: 无
- 域名: hr-vendor.example
- 文件 Hash: 无
- 其他 IOC: https://bit.ly/hr-portal-example, notify@hr-vendor.example

## 关键证据

- Sender domain aligned with SPF and DKIM.
- Destination domain matched approved supplier inventory.
- No credential prompt anomaly observed.

## 研判过程摘要

1. 确认告警场景与核心风险：Payroll update email was flagged due to a shortened URL, but the destination was the approved HR vendor portal.
2. 提取关键证据并交叉验证：Sender domain aligned with SPF and DKIM.
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：误报。

## 结论依据

- 结论为误报。
- 最关键依据：Sender domain aligned with SPF and DKIM.
- 补充依据：Destination domain matched approved supplier inventory.

## 处置建议

- 记录误报原因，并更新检测例外或抑制条件。

## 可复用模式

- 命中模式: scenario:phishing, alert_type:mail_suspicious_link
- 误报特征: 本案最终确认为误报，可用于补充抑制条件。
- 需关注的变体: 相关标签：phishing, email, false-positive, vendor

## 关联知识

- 关联 Playbook: [[PB-PHISH-001]]
- 关联 KB: [[KB-PHISH-HEADER-CHECK]], [[KB-CRED-HARVEST-PATTERNS]]
- 关联历史 Case: [[CASE-2026-0004]], [[CASE-2026-0001]]
- 关联实体: [[bob@corp.example]], [[HR-LAPTOP-03]]

## 自动关联推荐

### 推荐历史 Case

- [[CASE-2026-0004]] (case score=0.549) This directory contains a structured incident case report related to a phishing attack targeting a shared mailbox via a spoofed OneDrive not...
- [[CASE-2026-0001]] (case score=0.532) This directory contains a structured case report detailing a high-severity phishing incident targeting a finance user via a malicious invoic...

### 推荐知识条目

- [[PB-PHISH-001]] (knowledge score=0.514) This directory contains a phishing email investigation playbook designed to standardize incident response procedures for suspicious emails, ...
- [[KB-CRED-HARVEST-PATTERNS]] (knowledge score=0.494) This directory contains a structured knowledge base artifact focused on identifying and investigating credential harvesting campaigns, parti...

## 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_link
- #verdict/false-positive
- #phishing
- #email
- #false-positive
- #vendor