Definition
Analyzing intercepted or summarized computer network traffic to detect unauthorized activity.
Implementation perspective
Network Traffic Analysis should be treated as a technical defensive capability rather than a product checkbox. In practice, teams should define the protected scope, the conditions under which the technique acts, and the observable evidence that demonstrates the intended behavior. For this technique, likely engineering context includes Certificate File, DNS Lookup, File Transfer Network Traffic, Inbound Internet Network Traffic.
Use the technique to identify suspicious, unauthorized, or abnormal activity through observable evidence and repeatable analysis.
Questions to ask
- Which events, states, or artifacts must be observed for the analysis to work?
- What analytic logic, threshold, comparison, or signature turns observations into a finding?
- How are expected false positives, blind spots, and environmental variations documented?
- Who receives the result, and what action is expected when the technique produces a finding?
Evidence and validation
- Telemetry and data-source configuration records
- Analytic logic, thresholds, signatures, and version history
- Test cases demonstrating expected positive and negative results
- Alert, triage, escalation, and tuning records
Common failure patterns
- Required telemetry is missing, delayed, or transformed in a way that invalidates the analysis.
- The technique produces alerts without an accountable triage and response process.
- Detection coverage is claimed from product deployment without testing the relevant analytic behavior.
This implementation perspective is original Bare Metal Cyber educational content. It does not replace the official D3FEND definition or establish that a specific product implements the technique.
Technique hierarchy
Top-level family
Parent techniques
None listed at this level.
Direct child techniques
- D3-ANAA Administrative Network Activity Analysis
- D3-APCA Application Protocol Command Analysis
- D3-BSE Byte Sequence Emulation
- D3-CA Certificate Analysis
- D3-CSPP Client-server Payload Profiling
- D3-CAA Connection Attempt Analysis
- D3-DNSTA DNS Traffic Analysis
- D3-FC File Carving
- D3-ISVA Inbound Session Volume Analysis
- D3-IPCTA IPC Traffic Analysis
- D3-NTCD Network Traffic Community Deviation
- D3-NTSA Network Traffic Signature Analysis
- D3-PHDURA Per Host Download-Upload Ratio Analysis
- D3-PMAD Protocol Metadata Anomaly Detection
- D3-RPA Relay Pattern Analysis
- D3-RTSD Remote Terminal Session Detection
- D3-RTA RPC Traffic Analysis
Artifacts and ontology entities
These relationships describe how D3FEND connects a defensive technique to artifacts or other ontology entities. They describe graph semantics, not a product certification.
Show inferred artifact relationship paths (18)
NIST SP 800-53 relationships
The relation label is preserved from the D3FEND ontology. It is not converted into a claim that the control automatically implements or validates this technique.
ATT&CK Enterprise mitigation relationships
These links come from the D3FEND ontology’s ATT&CK mitigation mapping. They help users navigate between the knowledge bases and do not guarantee mitigation effectiveness.
D3FEND note: D3FEND models this as an infrastructure dependency to support D3-NTA.
D3FEND note: M1021 scope is broad, touches on an wide variety of techniques in d3fend.
Offensive-technique relationships
These relationships are generated from D3FEND graph paths and are explicitly experimental. They should be treated as hypotheses for defensive analysis—not as proof that the technique prevents, detects, or removes an offensive behavior.
ATT&CK Enterprise (74)
Showing the first 60 of 74 source-derived relationships. Open the official D3FEND technique for the current graph view.
ATT&CK for ICS (20)
Authoritative sources
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