Investigating a Suspected Internal Data Leak
An IT security analyst must evaluate an urgent SIEM alert regarding anomalous database exports and decide on immediate containment actions.
Context
You are an IT Security Analyst at a cloud software company. At 07:30 AM, the Security Information and Event Management (SIEM) platform triggered a high-severity alert indicating an abnormal spike in outbound database queries and potential data exfiltration originating from a senior developer's workstation credentials.
The Head of IT wants an initial incident containment and remediation decision by 08:30 AM to prevent customer data loss while minimising unnecessary disruption to production services.
Your Task
Present your incident response plan to the Head of IT structured in three exact sections:
- Recommendation
- Impact
- Implementation Plan
Available Data
The initial alert triggered following automated detection of bulk records accessed outside standard business hours.
SIEM Event Summary (Past 12 Hours)
| Timestamp | Event ID | Source User / Entity | Source IP | Action / Target | Volume / Result |
|---|---|---|---|---|---|
| 02:14 AM | SEC-104 | dev_lead_service | 10.14.2.88 (Internal) | Auth Token Refresh | Success (MFA Cached) |
| 02:18 AM | SEC-891 | dev_lead_service | 198.51.100.44 (External) | Session Token Auth | Valid Session Accepted |
| 02:22 AM | SEC-902 | dev_lead_service | 198.51.100.44 (External) | Customer DB Query | 450,000 Records Read |
| 02:35 AM | SEC-905 | dev_lead_service | 198.51.100.44 (External) | S3 Export Bucket | 3.2 GB Transferred |
| 04:10 AM | SEC-301 | dev_lead_service | 198.51.100.44 (External) | Admin Console Access | Access Denied (Privilege) |
The operations team believes the developer's corporate password was compromised through a brute-force credential stuffing attack and suggests immediately issuing an enterprise-wide password reset and blocking the external IP subnet at the perimeter firewall.