Archive for the ‘Wireshark’ category
Analyzing a failed TLS connection
Summary This post demonstrates how to correlate two or more trace files to analyze a broken connection. We identify the root cause and gather information about the network topology. Tracefiles are available at http://www.packet-foo.com/blog/TLS/Skype.zip We assume that the reader is familiar with TCP basics like session setup, retransmissions, window size etc.
Wireless Capture on Windows
Capturing Wireless on Windows was always problematic, because other than on Linux or Mac it wasn’t possible to activate Monitor mode on the WiFi cards to capture the radio layer. All you could do was capture packets on your WiFi card from the Ethernet layer and up. That’s unless you spent money on the now […]
Every once in a while there is some news about Wireshark being vulnerable to being attacked/exploited/pwned, meaning that there is a way to craft frames/packets in a pcap/pcapng file to make Wireshark crash and (if done right) execute malicious code. So let’s take a look at what that means and what can be done about […]
Wireshark Column Setup Deepdive
Every once in a while I check the blog statistics for the searches that have brought visitors here. Most of them are more or less concealed versions of “how can I grab the password of others/my ex partner/my children/friends”, which comes as no surprise. Today I saw one search expression that I used as inspiration […]
PCAP Split and Merge
Sometimes it also happens during network troubleshooting engagements, but it is also common for analysis jobs regarding network forensics: dealing with huge number of packets, sometimes millions or more. Two typical situations may have you scratch your head: either you have one huge file containing all packets at once, or you have a ton of […]
SMB System Error 384
This blog post highlights a very specific detail of Microsoft’s implementation of SMB. It might help those, who try to get rid of SMB version 1 and support staff dealing with inaccessible file shares.
Wireshark GeoIP resolution setup V2.0
I already wrote a blog post about setting up GeoIP resolution for Wireshark in 2013. Now, almost exactly five years later I had to decide if I replace that one with an updated version, or to write a second, updated post instead. I choose the second option.
System Error 58 – Wireshark to the rescue
The other day I was called to investigate a problem where a user could no longer mount a share. The client was running Windows 7. The user got the somewhat obscure message “System error 58 occurred”.
Sharkfest 2017 US Recap – 10 years of Sharkfest!
Time always flies at Sharkfest, the annual Wireshark conference, and the 2017 edition – being the 10th Sharkfest in the US – has been no exception. On Friday Sake and me talked about how fast the 3 day conference had felt and we both agreed that “hm, it seems just to have started moments ago […]
The Network Capture Playbook Part 3 – Network cards
One of the most common answers that come to my mind when being asked questions during or after a talk at a conference is the famous phrase “it depends…”. This may sound unsatisfactory at first, but the problem with a lot of questions regarding network analysis (and packet capture) is that there are always so […]