NetworkMiner Blue Team Series Part 1: Extracting Artifacts from PCAP

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What Is NetworkMiner?

NetworkMiner is a free, open-source Network Forensic Analysis Tool (NFAT) for Windows that passively captures network traffic or analyzes existing PCAP files. Unlike Wireshark which focuses on packet-level analysis, NetworkMiner automatically reassembles and extracts artifacts from network sessions — files, credentials, certificates, images, and host information — making it an essential tool for blue team analysts and incident responders. For the CySA+ CS0-003 exam, NetworkMiner is referenced as a network analysis tool in the context of evidence collection and forensic investigation.

NetworkMiner vs Wireshark — Key Differences

Wireshark is a packet capture and analysis tool that shows you every individual packet in detail — ideal for deep protocol analysis, filter-based investigation, and building detection rules. NetworkMiner is a session reconstruction tool that automatically extracts artifacts from captured traffic — ideal for quickly identifying what files were transferred, what credentials were exposed, and what hosts communicated. Think of Wireshark as the microscope and NetworkMiner as the evidence extractor. In a real blue team investigation you would use both — Wireshark to analyze suspicious traffic patterns and NetworkMiner to extract the actual files and credentials from that traffic.

Installing and Setting Up NetworkMiner

NetworkMiner is available as a free download from netresec.com. The free version handles most blue team tasks including PCAP analysis, host identification, file extraction, and credential capture. Download the zip file, extract it, and run NetworkMiner.exe — no installation required. For the paid Professional version, additional features include geolocation, port independence, and scripting capabilities, but the free version is sufficient for the CySA+ exam and most SOC investigations. To load a PCAP file go to File → Open and select your capture file. NetworkMiner will automatically parse it and populate the Hosts, Files, Credentials, Sessions, and DNS tabs.

The Five Key Tabs You Must Know

The Hosts tab shows all IP addresses that appeared in the capture, along with operating system fingerprinting, open ports, and hostname information — useful for quickly building a network map of what was communicating during an incident. The Files tab automatically extracts and reconstructs files that were transferred over unencrypted protocols like HTTP, FTP, SMB, and TFTP — allowing you to recover documents, executables, images, and other files directly from the traffic. The Credentials tab captures username and password combinations that appeared in cleartext — FTP, HTTP Basic Auth, Telnet, and similar unencrypted protocols. The Sessions tab provides a summary of all TCP and UDP sessions in the capture — source IP, destination IP, port, protocol, and data volume. The DNS tab shows all DNS queries and responses in the capture — useful for identifying C2 domains, suspicious lookups, and data exfiltration via DNS tunneling.

Key Blue Team Use Cases

During an incident investigation NetworkMiner lets you rapidly answer the key questions. What files left the network? Open the Files tab and sort by protocol — anything transferred over HTTP or FTP without encryption is recoverable. Were any credentials exposed? Open the Credentials tab — cleartext passwords from FTP, Telnet, or HTTP Basic Auth appear here immediately. What hosts were involved? Open the Hosts tab to see every device that communicated, with OS fingerprinting data to help identify unknown systems. What domains were queried? Open the DNS tab to spot C2 callbacks, unusual TLDs, or high-frequency queries indicating DNS tunneling.

CySA+ Exam Takeaways — Part 1

NetworkMiner is a passive network forensic tool — it does not inject packets or disrupt traffic. It reconstructs sessions from PCAP files to extract artifacts. The five key tabs are Hosts, Files, Credentials, Sessions, and DNS. NetworkMiner complements Wireshark — use Wireshark for deep packet analysis and NetworkMiner for artifact extraction. For the CySA+ exam, NetworkMiner falls under evidence collection, network forensics, and incident response tools in Domain 3. Continue to Part 2 to learn advanced filtering, malware artifact recovery, and building an investigation workflow.