Netresec naturbild

Network Forensics and
Network Security Monitoring

Netresec is an independent software vendor with focus on the network security field. We specialize in software for network forensics and analysis of network traffic.

Our most well known product is NetworkMiner, which is available in a professional as well as free open source version. We also develop and maintain other software tools, such as CapLoader (for big pcap files) and RawCap (a lightweight sniffer).

We at Netresec additionally maintain a comprehensive list of publicly available pcap files.

NetworkMiner logo


NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows. NetworkMiner can be used as a passive network sniffer/packet capturing tool in order to detect operating systems, sessions, hostnames, open ports etc. without putting any traffic on the network. NetworkMiner can also parse PCAP files for off-line analysis and to regenerate/reassemble transmitted files and certificates from PCAP files.

CapLoader logo


CapLoader is a Windows tool designed to handle large amounts of captured network traffic in the tcpdump/libpcap format (PCAP). CapLoader displays the contents of opened PCAP files as a list of TCP and UDP flows. Users can select the flows of interest and quickly filter out those packets from the loaded PCAP files. Sending the selected flows/packets to a packet analyzer tool like Wireshark or NetworkMiner is then just a mouse click away.

PolarProxy logo


PolarProxy is a transparent TLS and SSL inspection proxy created for incident responders, malware analysts and security researchers. PolarProxy is primarily designed to intercept and decrypt TLS encrypted traffic from malware that is run in a controlled environment, such as a sandbox. PolarProxy decrypts and re-encrypts TLS traffic, while also saving the decrypted traffic in a PCAP file.

Additional software from Netresec can be found on our products page.

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Headlines from our Blog

Online Network Forensics Class
I will teach two live online classes this autumn, one in October and one in November. The subject for both classes is network forensics for incident response. The training is split into four interactive morning sessions, so that you have the afternoon free to either practice what you learned in clas[...]
Remote Sniffing from Mikrotik Routers
One of the new features in NetworkMiner 2.9 is a TZSP streaming server. It is designed to read a real-time stream of sniffed packets from Mikrotik routers. This method for remote sniffing can be used to capture packets regardless if NetworkMiner is running in Windows or Linux. How to Sniff Packets w[...]
NetworkMiner 2.9 Released
NetworkMiner 2.9 brings several new and improved features to help analysts make sense of network traffic from malware, criminals and industrial control systems. Highlights from this new version include: TZSP supportStealC extractorImproved Modbus parserJA4 supportGTP decapsulationMalware Traffic Art[...]
Kubernetes Cryptojacking
In this video I take a look at a cryptojacking attack against a Kubernetes honeypot. The attackers were surprisingly quick to discover this unsecured Kubernetes deployment and use it to mine Monero for them. The analyzed capture files can be downloaded from[...]
PolarProxy 1.0 Released
I am thrilled to announce the release of PolarProxy version 1.0 today! Several bugs that affected performance, stability and memory usage have now been resolved in our TLS inspection proxy. PolarProxy has also been updated with better logic for importing external root CA certificates and the HAProxy[...]
Network Forensics training at x33fcon
This training has been canceled. Our upcoming training events can be found here:
Hunting for Cobalt Strike in PCAP
In this video I analyze a pcap file with network traffic from Cobalt Strike Beacon using CapLoader. The pcap file and Cobalt Strike malware config can be downloaded from Recorded Future's Triage sandbox. Cobalt Strike Beacon configs can also be extracted locally with help of Didier Stevens'[...]