In today's rapidly evolving cybersecurity landscape, staying vigilant and proactive is crucial. This article outlines a comprehensive approach to investigating and mitigating a potential security threat, specifically when alerted to unauthorized file transfers from a work environment to a personal cloud storage account.
Scenario: Your organization receives an alert from Microsoft Defender, integrated with your Jira system, indicating that an employee has transferred files from the work environment to their personal OneDrive account.
Investigation Process:
Alert Reception and Initial Triage
Immediately review the alert details in Jira
- Identify the user account and device involved
- Assess for immediate signs of compromise or abnormal behavior
Incident Isolation
- Temporarily restrict the user's access to sensitive systems
- Isolate the device from the network to prevent potential further exfiltration
Enhanced Visibility through Cloud App Security
- Access your organization's Cloud App Security portal for deeper insights
Device Traffic Analysis
- Examine device traffic, uploads, and data transfers
- Focus on specific cloud storage services (e.g., Wasabi)
Timeline Examination
- Review the device's activity timeline for a comprehensive view of events
Policy Verification
- Confirm existing security policies (e.g., alerts for transfers exceeding 50MB or involving more than 50 users)
- Analyze the user's browser activity, IP addresses, and web application usage
- Utilize threat intelligence tools to investigate any suspicious domains or applications within your "Microsoft Defender"
Threat Intelligence
- Attempt to determine the nature and sensitivity of the transferred data.
- Review and adjust permissions for unsanctioned cloud applications
- Map out the sequence of events to pinpoint the root cause of the incident
In-Depth Domain Analysis
Use developer tools to verify the legitimacy of involved domains and subdomains. For practice purpose, Here is how to expand your findings, click on any web browser of your choice, go to the hamburger- click "more tools"- developers tools-sources.
Data Classification
Cloud App Access Management
Event Mapping and Root Cause Analysis
Conclusion: In this case study, our investigation revealed that the user's Firefox browser was communicating with Wasabi cloud storage on multiple occasions. This methodical approach demonstrates how to effectively analyze security events, identify potential threats, and determine appropriate responses to maintain your organization's data integrity and security posture.
Remember, the key to effective cybersecurity is not just in responding to threats, but in continuously improving your detection and response capabilities based on each incident encountered.
Referencing: Microsoft
https://www.microsoft.com/en-ca/security/business/microsoft-defender
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