Network Traffic Analysis for Security
Network Traffic Analysis (NTA) uses a combination of flow data, packet inspection, and machine learning to detect malicious activity that evades traditional signature-based detection. It provides visibility into east-west traffic that perimeter tools miss.
Data Sources
Flow Data (NetFlow/sFlow/IPFIX)
Metadata about network connections:- Source/destination IP and port
- Protocol, bytes transferred, duration
- Lightweight, scalable to large networks
Full Packet Capture
Complete network traffic recording:- Deep inspection capability
- Evidence for forensics
- Storage-intensive
DNS Logs
Domain resolution records revealing:- Malware communication patterns
- Data exfiltration via DNS tunneling
- Domain Generation Algorithm (DGA) activity
Detection Capabilities
Command & Control (C2) Beacons
- Regular intervals: Connections at fixed periods (e.g., every 60 seconds)
- Jitter detection: Slight randomization in beacon timing
- Unusual destinations: Connections to rarely-seen domains or IPs
- Encrypted channels: TLS to non-standard ports
Data Exfiltration
- Volume anomalies: Unusual outbound data transfers
- Protocol abuse: DNS tunneling, ICMP tunneling
- Timing: Data transfers during off-hours
- Destination analysis: Transfers to new or suspicious external hosts
Lateral Movement
- Internal scanning: Sequential port probing across subnets
- Credential abuse: Authentication to multiple systems rapidly
- Protocol anomalies: RDP/SSH from unexpected sources
- Share access: Unusual SMB/CIFS activity
Implementation
- Deploy flow collection at network boundaries and between segments
- Establish traffic baselines over 2-4 weeks
- Configure detection rules for known malicious patterns
- Implement ML-based anomaly detection for unknown threats
- Integrate with SIEM for alert correlation
Where SuperClue Fits
SuperClue does not inspect packets or flow data. Its SOC agent records network connections on each host, and you can add IP and domain IOCs so it can flag connections to known bad destinations.