Full Report
Great idea, guys. Let's keep all of the data in an Excel file with weak password protection PWNED Welcome, once again, to PWNED, the weekly column where we recount the adventures of IT explorers who found their own pile of quicksand and then jumped right into it. This week's story involves keeping sensitive information in a very vulnerable place and then not protecting it adequately.…
Analysis Summary
# Incident Report: Fintech Root Credential Exposure via Unsecured Spreadsheet
## Executive Summary
During a strategic security audit of a fintech startup, investigators discovered a cleartext-adjacent repository of critical administrative credentials. Root database passwords and Master AWS IAM keys were stored in a weakly password-protected Excel file on a company-wide accessible SharePoint site. While no active exploitation by external threat actors was reported, the data was exposed to all internal employees and contractors for eight months due to a departmental dispute over tooling.
## Incident Details
- **Discovery Date:** Approximately April 2026 (Audit period)
- **Incident Date:** Ongoing for 8 months prior to discovery
- **Affected Organization:** Unnamed Fintech Startup
- **Sector:** Financial Technology (Fintech)
- **Geography:** Undisclosed
## Timeline of Events
### Initial Access
- **Date/Time:** 8 months prior to audit
- **Vector:** Intentional internal placement (Shadow IT/Process Breakdown)
- **Details:** DevOps and DBA teams created an "interim" spreadsheet to share credentials following a disagreement over password management software.
### Lateral Movement
- **Details:** Not applicable in a traditional "attack" sense; however, any employee or contractor with access to the corporate intranet could navigate to the "DevOps_Handoff" folder.
### Data Exfiltration/Impact
- **Details:** Potential for total cloud environment takeover. The spreadsheet contained Root DB credentials and Master AWS IAM keys. No evidence of malicious exfiltration was confirmed before the audit intervention.
### Detection & Response
- **How it was discovered:** Discovered by Stanislav Kazanov (Innowise) during a compliance and data architecture audit.
- **Response actions taken:** Identified the vulnerability to leadership; presumed remediation via implementation of a formal password manager and deletion of the file.
## Attack Methodology
- **Initial Access:** Valid internal user credentials (Intranet access).
- **Persistence:** High; the file remained in place for 8 months.
- **Privilege Escalation:** Direct path to Administrative/Root privileges via the spreadsheet.
- **Defense Evasion:** None; the file was "hidden" in plain sight with a descriptive name.
- **Credential Access:** Weak Excel password protection (Company Name + Year); easily cracked or guessed.
- **Discovery:** Browseable via "DevOps_Handoff" folder on the company SharePoint.
- **Lateral Movement:** Access to the spreadsheet granted keys to move from the intranet to the production database and AWS cloud infrastructure.
- **Collection:** Centralized "one-stop-shop" for all critical infrastructure keys.
- **Exfiltration:** N/A (Internal discovery).
- **Impact:** Potential for catastrophic data loss, financial theft, or total operational shutdown.
## Impact Assessment
- **Financial:** High Risk. The company had $>1M invested in security systems and handled significant assets; a breach could have cost millions.
- **Data Breach:** Risk of full production database exposure (Fintech customer data).
- **Operational:** Risk of total cloud infrastructure deletion or ransomware via Master AWS keys.
- **Reputational:** Massive loss of trust; irony of "military-grade" marketing failing at basic credential hygiene.
## Indicators of Compromise
- **File indicators:** `Prod_DB_Root_Creds_DO_NOT_SHARE.xlsx`
- **Behavioral indicators:** Excessive logins to SharePoint from unauthorized users to the DevOps folder; use of Root AWS keys for routine tasks.
## Response Actions
- **Containment:** Audit discovery immediately flagged the file to management.
- **Eradication:** Deletion of the spreadsheet and (presumably) rotation of all compromised credentials.
- **Recovery:** Formalization of a centralized, enterprise-grade password management solution.
## Lessons Learned
- **Tooling Deadlock:** Security is compromised when teams cannot agree on tools. A "temporary" insecure solution often becomes a permanent vulnerability.
- **The "Internal Trust" Fallacy:** Physical security and MFA are negated if root keys are left in a shared folder accessible to all staff.
- **Audit Value:** Third-party audits are essential for finding "human element" vulnerabilities that automated EDR/MFA tools might miss.
## Recommendations
- **Zero Trust Architecture:** Implement the principle of least privilege; intranet users should never have access to DevOps handoff folders by default.
- **Secrets Management:** Enforce the use of a dedicated Secrets Vault (e.g., HashiCorp Vault, AWS Secrets Manager) rather than a password manager for root/API keys.
- **Policy Enforcement:** Establish a clear "Chain of Command" for IT infrastructure decisions to prevent "interim" spreadsheets from being used during departmental disputes.
- **Automated Scanning:** Use DLP (Data Loss Prevention) tools to scan SharePoint for files containing keywords like "Password," "Creds," or "Root."