Wireshark Network Traffic Analysis

Detailed Guide

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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.