## Investigation Summary
The suspicious vendor login detected indicates potential unauthorized access to the retail network. The login was traced back to an IP address known for previous cyber activities linked to the FIN6 group.

## Incident Details
- **Date & Time**: [Timestamp]
- **Source IP**: [Suspicious IP Address]
- **Affected System**: Vendor portal

## Recommendations
- Immediately review access logs for the vendor portal.
- Implement multi-factor authentication for vendor accounts.
- Conduct a security audit of all vendor credentials.

## Next Steps
Prepare for potential escalation of activities, such as malware deployment, given historical patterns of FIN6 operations.