Ransomware Prevention and Response
Comprehensive guide to preventing ransomware attacks and responding effectively when they occur.
Ransomware Prevention and Response
Understanding Ransomware
Attack Vectors
- Phishing emails
- Exposed RDP
- Software vulnerabilities
- Supply chain compromise
- Drive-by downloads
Ransomware Types
- Crypto: Encrypts files
- Locker: Locks system access
- Double Extortion: Encrypt + data theft
- RaaS: Ransomware as a Service
Prevention Measures
Technical Controls
- Endpoint detection and response (EDR)
- Email security and filtering
- Patch management
- Network segmentation
- Web filtering
- Privileged access management
- Multi-factor authentication
Backup Strategy
- 3-2-1 rule (3 copies, 2 media, 1 offsite)
- Immutable/air-gapped backups
- Regular testing
- Offline/disconnected storage
- Rapid recovery capability
User Awareness
- Phishing simulation
- Security training
- Reporting procedures
- Social engineering awareness
Detection
Indicators of Compromise
- Unusual file extensions
- Encryption activity
- Network anomalies
- Disabled security tools
- Ransom notes
Monitoring
- File integrity monitoring
- Network traffic analysis
- Endpoint telemetry
- User behavior analytics
Response Playbook
Immediate Actions (0-4 hours)
- Isolate affected systems
- Preserve evidence
- Activate incident response team
- Assess scope and impact
- Notify leadership
Short-term Actions (4-24 hours)
- Contain spread
- Identify variant
- Assess backup viability
- Engage external resources
- Begin communications
Recovery Phase
- Validate backup integrity
- Rebuild clean systems
- Restore data
- Enhanced monitoring
- Phased reconnection
The Ransom Decision
Considerations:
- Data criticality
- Backup availability
- Legal implications
- Attacker reliability
- Business impact
- Regulatory requirements
Note: FBI recommends against paying, but decision is complex.
Post-Incident
- Root cause analysis
- Control improvements
- Training updates
- Plan revisions
- Regulatory notifications