NETRESEC Network Security Blog

The new release of PolarProxy generates JA4 fingerprints and enables ruleset to match on specific decryption errors, for example to enable fail-open in case the TLS traffic cannot be decrypted and inspected. JA4 FingerprintsJA4 fingerprints provide several improvements over its JA3 predecessor. One[...]

Over 90 percent of all web traffic is encrypted nowadays, which is great of course. However, as HTTP and DNS traffic gets encrypted, defenders have a more difficult time blocking malicious network traffic. One solution to this problem is to use a TLS firewall, which effectively blocks encrypted conn[...]

The VoIP tab is a unique feature only available in NetworkMiner Professional. The analyzed PcapNG file comes from a blog post by Johannes Weber titled VoIP Captures. See our NetworkMiner Professional tutorial videos for more tips and hints.

The Browsers tab is a unique feature only available in NetworkMiner Professional. The PCAP files analyzed in this video are pwned-se_150312_outgoing.pcap and pwned-se_150312_incoming.pcap, which are snippets of the 4.4 GB Hands-on Network Forensics dataset from FIRST 2015 (slides). More information[...]

The PCAP file analyzed in this video is pwned-se_150312_outgoing.pcap, which is a snippet of the 4.4 GB Hands-on Network Forensics dataset from FIRST 2015 (slides). See our NetworkMiner Professional tutorial videos for more tips and hints.

The PCAP file analyzed in this video is MD_2015-07-22_112601.pcap, which is a snippet of the training data used in our network forensics classes from 2015 to 2019. Techniques, tools and databases mentioned in the tutorial: CIDR notationSatorip0fmac-ages Check out our Passive OS Fingerprinting blog p[...]

This video tutorial demonstrates how to open capture files with NetworkMiner Professional The analyzed pcap-ng file is github.pcapng from CloudShark. More info about this capture file can be found in our blog post Forensics of Chinese MITM on GitHub. See our NetworkMiner Professional tutorial videos[...]

This video tutorial covers how to install NetworkMiner Professional. Use the official 7-zip tool to extract the password protected 7zip archive. Recommended locations for NetworkMiner: DesktopMy DocumentsC:\Users\{user}\AppData\Local\Programs\USB flash drive See our NetworkMiner Professional tutoria[...]

This video tutorial covers how to install NetworkMiner Professional. Use the official 7-zip tool to extract the password protected 7zip archive. Recommended locations for NetworkMiner: DesktopMy DocumentsC:\Users\{user}\AppData\Local\Programs\USB flash drive See our NetworkMiner Professional tutoria[...]

A new release of CapLoader has been published! Some of the changes can be seen directly in the user interface, such as Community ID values for flows and a few other new columns in the Flows and Services tabs. Other improvements are more subtle, like improved detection of remote management protocols[...]

Do you want to analyze decrypted TLS traffic in Wireshark or let an IDS, like Suricata, Snort or Zeek, inspect the application layer data of potentially malicious TLS encrypted traffic? There are many different TLS inspection solutions to choose from, but not all of them might be suitable for the sp[...]

Update: The class in October has been canceled. If you'd like to take the online class then November 18 is your chance! 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[...]

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 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[...]

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 fromhttps://share.netresec.com/s/S5ZG2cDKB9Abqw[...]

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[...]

This training has been canceled. Our upcoming training events can be found here:https://www.netresec.com/?page=Training