138 أسطر
5.4 KiB
Plaintext
138 أسطر
5.4 KiB
Plaintext
Task5:
|
||
|
||
Scenario
|
||
A ransomware attack has encrypted all files stored on Ghaymah Block Storage.
|
||
Users can no longer access their files, and the attacker demands payment in exchange for the decryption key.
|
||
________________________________________
|
||
1. Emergency Response Plan (First 60 Minutes)
|
||
|
||
0–15 Minutes: Identification & Isolation
|
||
Objectives
|
||
• Confirm that a ransomware attack has occurred.
|
||
• Prevent the malware from spreading.
|
||
Actions
|
||
• Disconnect affected virtual machines from the network.
|
||
• Disable access to shared Block Storage volumes.
|
||
• Block suspicious IP addresses using firewall rules.
|
||
• Stop scheduled synchronization tasks.
|
||
• Notify the security and incident response teams.
|
||
|
||
|
||
15–30 Minutes: Investigation
|
||
Objectives
|
||
Determine the scope of the attack.
|
||
Actions
|
||
• Review system and application logs.
|
||
• Identify the ransomware entry point.
|
||
• Determine which servers and storage volumes are affected.
|
||
• Preserve logs and forensic evidence.
|
||
• Check whether backups are intact.
|
||
|
||
30–45 Minutes: Containment & Eradication
|
||
Objectives
|
||
Remove the ransomware and stop further encryption.
|
||
Actions
|
||
• Isolate infected systems.
|
||
• Scan all virtual machines with antivirus/EDR tools.
|
||
• Remove malicious processes and scheduled tasks.
|
||
• Rotate compromised credentials.
|
||
• Patch exploited vulnerabilities.
|
||
|
||
45–60 Minutes: Recovery Preparation
|
||
Objectives
|
||
Prepare for service restoration.
|
||
Actions
|
||
• Verify the integrity of backups.
|
||
• Restore critical services in a test environment.
|
||
• Validate restored data.
|
||
• Monitor systems for reinfection.
|
||
Gradually return services to production.
|
||
Timeline Summary
|
||
Time Activity
|
||
0–15 min Detect attack and isolate affected systems
|
||
15–30 min Investigate logs and identify affected resources
|
||
30–45 min Remove ransomware and secure infrastructure
|
||
45–60 min Restore from backups and validate services
|
||
________________________________________
|
||
|
||
2. Ghaymah Backup & Recovery Strategy
|
||
|
||
Recovery Point Objective (RPO)
|
||
Definition: The maximum acceptable amount of data loss.
|
||
Proposed Value: 15 minutes
|
||
This means backups or snapshots should occur at least every 15 minutes for critical data.
|
||
________________________________________
|
||
Recovery Time Objective (RTO)
|
||
Definition: The maximum acceptable downtime before services are restored.
|
||
Proposed Value: 1 hour
|
||
Critical applications should be operational again within one hour.
|
||
________________________________________
|
||
Backup Strategy
|
||
Daily Incremental Backups
|
||
Capture only changes made since the previous backup.
|
||
Advantages: Faster , Less storage usage
|
||
________________________________________
|
||
Weekly Full Backup
|
||
Create a complete copy of all Block Storage volumes.
|
||
Advantages: Faster restoration, Simplified disaster recovery
|
||
________________________________________
|
||
Monthly Offline Backup
|
||
Store a copy outside the production environment.
|
||
Purpose: Protection against ransomware encrypting online backups.
|
||
________________________________________
|
||
3-2-1 Backup Rule
|
||
The organization should follow the 3-2-1 backup strategy:
|
||
• 3 copies of the data (one primary + two backups).
|
||
• 2 different storage media (e.g., Block Storage and external storage/object storage).
|
||
• 1 off-site or offline backup stored separately from the production environment.
|
||
________________________________________
|
||
3. Comprehensive Prevention Plan
|
||
Identity & Access Management (IAM)
|
||
• Enable Multi-Factor Authentication (MFA).
|
||
• Apply the Principle of Least Privilege.
|
||
• Review user permissions regularly.
|
||
• Rotate passwords and API keys.
|
||
________________________________________
|
||
Network Security
|
||
• Enable firewalls.
|
||
• Segment production and backup networks.
|
||
• Restrict remote administration access.
|
||
• Use VPN for administrative access.
|
||
________________________________________
|
||
Endpoint Security
|
||
• Deploy Endpoint Detection and Response (EDR).
|
||
• Keep operating systems and software patched.
|
||
• Disable unnecessary services.
|
||
• Enable application allow-listing where appropriate.
|
||
________________________________________
|
||
Backup Protection
|
||
• Use immutable backups where possible.
|
||
• Encrypt backup data.
|
||
• Test backup restoration regularly.
|
||
• Store backups in separate locations.
|
||
________________________________________
|
||
|
||
Container Security
|
||
• Scan container images using Trivy before deployment.
|
||
• Avoid running containers as root.
|
||
• Store secrets securely.
|
||
• Continuously monitor container activity.
|
||
________________________________________
|
||
Monitoring & Detection
|
||
• Deploy a SIEM solution to centralize logs.
|
||
• Configure alerts for:
|
||
o Multiple failed logins.
|
||
o Unusual file modifications.
|
||
o Mass file encryption.
|
||
o Privilege escalation attempts.
|
||
________________________________________
|
||
Security Awareness
|
||
• Train employees to recognize phishing emails.
|
||
• Conduct regular security awareness sessions.
|
||
• Simulate phishing campaigns.
|
||
• Define clear incident reporting procedures.
|
||
________________________________________
|
||
Conclusion
|
||
A successful ransomware response depends on rapid detection, immediate isolation, reliable backups, and tested recovery procedures.
|
||
By implementing layered security controls—including strong IAM, network segmentation, continuous monitoring, secure container practices, and a resilient backup strategy based on the 3-2-1 rule—organizations using Ghaymah Cloud can significantly reduce the impact of ransomware attacks and recover services efficiently.
|