Wireshark Network Traffic Analysis

Detailed Guide

Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.

Constraints and Guardrails

Operational Boundaries

Capture only authorized network traffic
Handle captured data according to privacy policies
Avoid capturing sensitive credentials unnecessarily
Properly secure PCAP files containing sensitive data

Technical Limitations

Large captures consume significant memory
Encrypted traffic content not visible without keys
High-speed networks may drop packets
Some protocols require plugins for full decoding

Best Practices

Use capture filters to limit data collection
Save captures regularly during long sessions
Use display filters rather than deleting packets
Document analysis findings and methodology

Examples

Example 1: HTTP Credential Analysis

Scenario: Investigate potential plaintext credential transmission

1. Filter: http.request.method == "POST"
2. Look for login forms
3. Follow HTTP Stream
4. Search for username/password parameters

Finding: Credentials transmitted in cleartext form data.

Example 2: Malware C2 Detection

Scenario: Identify command and control traffic

1. Filter: dns
2. Look for unusual query patterns
3. Check for high-frequency beaconing
4. Identify domains with random-looking names
5. Filter: ip.dst == SUSPICIOUS_IP
6. Analyze traffic patterns

Indicators:

Regular timing intervals
Encoded/encrypted payloads
Unusual ports or protocols

Example 3: Network Troubleshooting

Scenario: Diagnose slow web application

1. Filter: ip.addr == WEB_SERVER
2. Check Statistics > Service Response Time
3. Filter: tcp.analysis.retransmission
4. Review I/O Graph for patterns
5. Check for high latency or packet loss

Finding: TCP retransmissions indicating network congestion.

When to Use

This skill is applicable to execute the workflow or actions described in the overview.

wireshark-analysis