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Skip to content How to convert SNMP OIDs in packet captures to human readable names ? A common problem while analyzing SNMP traffic is resolving OIDs to names.We don’t want to see this :Showing raw SNMP OIDs in the packet listWe want to see this :Showing human readable names in the packet listThe venerable Wireshark‘s own resolution capabilities work fine for many simple cases. With Wireshark, you can list the modules you need and have it load them upon startup. But what if you want to load thousands of MIBs ? What if you want to deal with badly written MIBs, MIBs with incorrect module names, MIBs with dependencies ? We might be able to help you.We make two products, Unbrowse SNMP and Unsniff Network Analyzer. Unbrowse SNMP is a full fledged SNMP tool that can compile almost anything you throw at it. It then persists the properties of each OID in a very efficient format on disk. The Unbrowse Scripting API provides a number of ways to get at this data. The other product, Unsniff is the actual SNMP packet analyzer. We have integrated both these products in such a way that Unsniff will use the OID information already available via Unbrowse.To use this feature : (Requires latest versions of Unbrowse SNMP and Unsniff Network Analyzer)Download and Install Unbrowse SNMPPress Crtl+M and select all the MIB files you want to addAlternately, Download a precompiled package (we have one containing all the Cisco MIBs)DoneUnsniff will automatically detect if the Unbrowse SNMP name resolution facility is installed and will then proceed to resolve all OIDs to the maximum extent it can.Resolving OIDs where ever they are foundThe advantages :Leverage Unbrowse SNMP’s very flexible compilerOIDs of thousands of modules are instantly available for resolutionHas no impact on Unsniff’s startup timeHigh speed resolution with low memory overheadScriptable via Ruby Each PDU to contain the names of handshake messages. So we can just select the PDUs which contains “Server Certificate” anywhere in its description.. UnsniffDB.PDUIndex.each do |pdu| next unless pdu.Description =~ /Server Certificate/ .. now pdu contains a server cert ..end Collect all the certificates in the stackFrequently a Server Hello + Server Certificate + Server Hello Done are packed intoa single PDU. We only need to work with the “Server Certificate” its easy to select this as the code shows below. # find the certificate handshake, the string "11 (certificate) " handshake = UWrap.new(pdu.Fields).find do |f| hst = f.FindField("Handshake Type") hst and hst.Value() == "11 (certificate)" end # select all the certs in the chain, the top level field is called "ASN.1Cert" certs = UWrap.new(certstack.SubFields).select { |f| f.Name == "ASN.1Cert" } In the above example, we are wrapping the pdu.Fields method in an Enumerable wrapper . This allows us to mix-in methods like Find and Select to the Unsniff Scripting objects which are backed by C++ classes.How to pull out issuer and subject names ?At this point, we now have a handle to each certificate in the chain. Our next and final task is to print the issuer and subject details. Our friend is the FindField method 1234567891011121314151617181920 # find the subject and issuer fields inside a cert subject = cert.FindField("subject") issuer = cert.FindField("issuer") # get the data which is inside a DirectoryString # we only want commonName and orgName, there are several more # like city, country, street etc. issuer.SubFields.each do |rdn| case rdn.FindField("type").Value when /commonName/ print "Common Name " = rdn.FindField("DirectoryString").Value ; when /organizationName/ print "Org Name = " + rdn.FindField("DirectoryString").Value ; end end Running the scriptThe complete script (xcert.rb) is available at the Unsniff Scripting Samples pages on our new Wiki.To run this script.Download Unsniff Network Analyzer (its a free download). Note that Unsniff is a Windows app.Download and install the latest Ruby Windows One Click Installer Download the xcert.rb scriptCapture some packets and save it as USNF format. You can also work with PCAP files directly, but you have to modify the script to import the PCAP file into USNF format first. See samples in Import / Export section for hints.Run the scriptFor the analyst with some scripting skillz ?The philosophy of both Unsniff and Trisul is to put powerful tools in the hands of the analyst. With mid-level skills in Ruby (or even VBScript) you can do amazing things automatically. Take out the tedium of clicking through to perform repeatable tasks. As an exercise you can extend this script to do the following:download the root certificates included with Firefox and compare the CAs in your chain for validityPart 2 : Add Trisul scriptingWe have seen how you can do such deep analysis with Unsniff scripting. But this requires you to have a capture file of a manageable size. What if you wanted tocheck all of your traffic during 9AM to 11AM yesterday and print the cert stack of each SSL sessionanalyze all SSL sessions

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Page.Have fun !—We just released Trisul 2.4. The major new feature in it is the API (Trisul Remote Protocol). Download it and let it watch your network. You never know when you may need its data. In this two part post, we are going to see how we can utilize the scripting capabilities of Unsniff and Trisul to build our own automated analysis tools. The task here is to scan all HTTPS traffic and print the certificate chain for each session seen.In Part 1 (this post) : We will use a standalone Unsniff script in Ruby to extract this information from a packet capture.In Part 2 (next post) – We will see how we can use a Ruby script to connect to a Trisul sensor, pull out all HTTPS certificate chains accessed by a particular IP over 24 hours.In the following example, the session between 212.149.50.181 and 192.168.1.5 is authenticated by the chain shown below it. The chain is : www.commerzbaking.de is signed by TC Trust Centre which is in turn signed by Cybertrust Global Root which is in turn signed by GTE Cybertrust Global Root. Certificate chain for 212.149.50.181 to 192.168.1.5 www.commerzbanking.de (Commerzbank AG) TC TrustCenter Class 4 Extended Validation CA II (TC TrustCenter GmbH) TC TrustCenter Class 4 Extended Validation CA II (TC TrustCenter GmbH) Cybertrust Global Root (Cybertrust, Inc) Cybertrust Global Root (Cybertrust, Inc) GTE CyberTrust Global Root (GTE Corporation)Certificate chain for 174.137.42.65 to 192.168.1.5 www.wireshark.org () PositiveSSL CA (Comodo CA Limited) PositiveSSL CA (Comodo CA Limited) UTN-USERFirst-Hardware (The USERTRUST Network) UTN-USERFirst-Hardware (The USERTRUST Network) AddTrust External CA Root (AddTrust AB) Where do we get this information ? As part of the SSL/TLS handshake the remote server sends its certificate chain in a protocol message called Server Certificate. Our Ruby script will look for these messages and print out the chain in the following format.. subject1 commonName (organizationName) issuer1 commonName (organizationName) subject2 (same as issuer1) commonName (organizationName) issuer2 commonName (organizationName) ... until the chain ends (ideally in a root CA) Using the Unsniff Scripting APIWe will write a tiny Ruby script and the Unsniff Scripting API to accomplish this task. (full code available here)Pull out all the PDUs containing a Server Certificate.For each cert in chain; navigate and print the commonName and organizationName of the subject and issuer.We want to pull out commonName/orgName for each subject+issuer pairKey methods in the scriptHow to pull out all reassembled SSL/TLS PDU records which contain a Server Certificate?A quick note : Users of Wireshark maybe a bit confused here. In Wireshark the unit of analysis is the link layer packet, i.e Ethernet or Wireless frames. Typically the final packet in the stream contains a link to reassembled content. Unsniff monitors PDUs as top level units. What you see in the PDU sheet are reassembled messages without regard for packet boundaries. TLS is a message layer built on top of a bytestream layer TCP. So we need to work with PDU’s for this example.Luckily for us, Unsniff sets the Description field of. Virus-free and 100% clean download. Get Unsniff Network Analyzer alternative downloads. Free alternatives to Unsniff Network Analyzer 1.8 for Windows. Unsniff Network Virus-free and 100% clean download. Get Unsniff Network Analyzer alternative downloads. Free alternatives to Unsniff Network Analyzer 1.8 for Windows. Unsniff Network

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Than seeing rendered HTML pages, other objects are flash, audio, scripts. For VoIP protocols, the user objects are audio channels and so forth. Read more..Connect different protocols layers togetherLook at reconstructed HTTP sessions, drill down to the TCP connections, then to the link layer packetsFar more effective than groping in the dark for the appropriate ethernet (or other link layer) frames Multilingual teaching Use any language for your teachingUnsniff is designed and built as a Unicode application from the ground up. We will be adding support for more languages based on customer demand. Unsniff as a teaching aidWhether you are teaching NET 101 or NET 901 - hands on lab assignments are essential for a complete understanding of the course material. Currently a large number of universities and colleges are using tools like tcpdump, or ethereal as the primary teaching aids. While these tools are excellent (especially Ethereal) in the sheer breadth of protocols supported, their weakness in visualization, reassembly, and extensibility make it hard to adapt them to a teaching environment. Unsniff is designed to be adaptable to various teaching situations. The simple and direct packet displays are so intuitive that your students will understand it instantly.In the classroom: You can use Unsniff to explain various network concepts such as TCP/IP handshaking, how protocols are layered on top of each other, client server communication, IPv4 and IPv6, etc. Printouts generated by Unsniff are so rich that they can be used in all your slides. No more drawing protocols by hand. The Unsniff packet display can be undocked so that it can be projected full-screen in classrooms with multiple projectors.Fun: Teaching is fun with Unsniff because of its high-level analysis capabilities. You can use a SIP phone to make a call - then play back the captured conversation. You can visit a few websites - and view the entire contents as is. Assignments: Unsniff is the ideal platform for lab assignments. Once you have a capture file with "interesting data" - you can ask students to answer various questions using Unsniff alone. For example : You can ask students to bookmark all packets that are part of a TCP/IP 3-way handshake - or - mark all link layer packets that form a PDU.Customize it: If you want to teach a specific topic such as TCP/IP congestion avoidance algorithm, you can write very simple scripts in VBScript or Ruby. These can Unsniff in EducationUniversity level networking and protocols coursesCisco / Juniper and other certification trainingSelf learningTeachers communicate better with UnsniffEnhance your teaching experience Current generation and open source tools have primitive visualization capabilities (hex dumps)Create new coursework material and assignmentsIntroduce an element of fun into your classroomTop features for teachers, students, and researchers Unmatched and pioneering visualizations Are you still asking your students to look at boring hex dumps ?Unsniff is set to change how protocols are visualized. We spent a lot of time desiging the visual breakout; layout algorithms and graphics that are specially suited for visualizing protocols. Make it easier for you to communicate concepts such as protocol layering, bit fields, IP addresses, ports, reassembly, and more !Self documenting: Your students can discover how protocols work by just using the self documenting bubble help feature of Unsniff. The ultimate self learning tool for network protocols. Stunning graphical printoutsCreate new course material, tests, slidesUnsniff goes the extra yard when it comes to printingPrint packets in full graphical detail for the desired layersPrint TCP ladder diagrams (must see)Create handouts and quizzes for your class using these printoutsCreate slides (transparencies) to help you with your class Create interactive assignments and projectsUnsniff is the ideal platform to create interesting projects and assignments. Some examples:Bookmarks and Annotations : You can post an interesting Unsniff capture file containing TCP packets and ask your students to bookmark all the 3-way hand shake packets. Annotations are small notes you can attach to any packet.Filters : Unsniff contains a powerful and easy to use capture and display filter wizard. You can ask students to create filters to look for certain types of traffic or to isolate traffic.Advanced : There are endless projects you can create using simple Unsniff Scripting, see examples of tracking busy servers, tcp analysis, and other samples at the script library. Special support for TCPGet your students to a different level using Unsniffs' powerful TCP analysis functionsSpecial "time-lag" ladder diagram allows you to communicate the most difficult concepts about TCPProjector friendly displaysUltimate printing support for ladder diagramsThe streams sheet allows students to watch TCP behavior in real time Top down analysis is fun Start from what is interesting"User objects" are another innovation from Unsniff. A user object is any entity that is of maximum interest to the user for a given context. For example : If we are talking about HTTP, what is more interesting

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Analyzing HTTP streamsThis article willintroduce you to various techniques for analyzingHTTP streams.Unsniff has powerful analysis capabilities for HTTP analysis including. * Extract content (user objects) fromHTTP streams * View entire HTML pages, images, flash,and media from within Unsniff * View all HTTP headers * View color-coded HTTP requests andresponses * Full web pages including inlineimages, flash, stylesheets supported * Click through to other captured pages * Save pages for later analysis * Scripts to extract interesting datafrom HTTP headers Thereconstruction capabilities are so powerful that several ofour customers are using Unsniff as an offline“recording” tool.Viewing HTTP headersFrom the “Packets” sheet click on any HTTP packet (except those labeled“Data continued..”).View all HTTP headers as columns in a listThis is useful if you want to analyze all HTTP headers as a group.Right click on any HTTP packet and select “ProtocolView” from the popup menu.The protocol details view shows all the HTTP header fields in a singlelist. You can select any item from the list to see the packet detailsin the pane below.View entire HTTP streamYou can analyze entire HTTP sessions using the stream analysiscapabilities of Unsniff. You can watch HTTP pipelining in action aswell as TCP behavior including usage of RST and Keep-Alive.You canswitch to the Streams sheet and watch all HTTP sessions inreal-time, you can see requests and responses as they appear.There are two ways to view a HTTP stream. Bottom up – Like older network analyzers, you canselect a HTTP packet – then right click and select“Locate Flow” from the popup menu. This takes youto the stream and the corresponding segment in that stream. Top down – Unsniff features full stream analysis.You can simply choose the stream you are interested in from a list. Youcan then work your way down to link layer packets if you desire. Youwill find yourself using Top Down analysis more frequently as youbecome familiar with UnsniffEither way you can see the entire stream as shown in the figure below,you can click on the ‘+’ icon next to each streamto show the individual segments that make up the stream. View request response dataYou can also view

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On previously captured data. Using the Trisul API (a.k.a Trisul Remote Protocol or TRP) you can write Ruby scripts to :securely connect to a Trisul Probesearch for various types of data (traffic stats, flows, alerts, URLs, DNS, and packets)pull out required PCAPs for further deep processing by Unsniff or WiresharkTask for Part 2We have a TRP Server running on demo2-dot-trisul-dot-org – your task is to connect to this server, search for all HTTPS activity from a suspicious host 192.168.1.105 over the past 1 month and print out the certificate chain of each connection. This will help you cut through several gigabytes of packets.The setup for TRPSecure connection to remote Trisul using RubyTry it out firstBefore we explain the code, lets gratify ourselves by running the sample code and getting some output.Install Ruby and the trisulrp gem (see the tutorial for help)Install Unsniff Network Analyzer (free) from the downloads page. You need this to do the deep analysis. Sorry this is a Windows MSI. If you are running Linux just comment out the print_cert_stack function.Download the csx.rb script from the samples pageDownload the demo client cert and key from and place them in the same directoryNote: You dont need to install Trisul or the Web Interface. We already have a probe running on demo2trisulorg. You are just setting up a script client environment.Run as below (password for the private key file is ‘client’ ) 1234567891011121314151617181920212223242526 C:\Users\Vivek\Documents\devbo\us\certxtrp>ruby csx.rb demo2.trisul.org 12001 192.168.1.105 httpsEnter PEM pass phrase:Certificate chain for 65.55.184.155 to 192.168.1.105 www.update.microsoft.com (Microsoft) Microsoft Secure Server Authority () Microsoft Secure Server Authority () Microsoft Internet Authority () Microsoft Internet Authority () GTE CyberTrust Global Root (GTE Corporation)Certificate chain for 65.55.184.27 to 192.168.1.105 www.update.microsoft.com (Microsoft) Microsoft Secure Server Authority () Microsoft Secure Server Authority () Microsoft Internet Authority () Microsoft Internet Authority () GTE CyberTrust Global Root (GTE Corporation)Certificate chain for 198.232.168.144 to 192.168.1.105 registration2.services.openoffice.org (Sun Microsystems, Inc) Sun Microsystems Inc SSL CA (Sun Microsystems Inc) Sun Microsystems Inc SSL CA (Sun Microsystems Inc) (VeriSign, Inc.) (VeriSign, Inc.) (VeriSign, Inc.) The csx.rb codeThe code is quite straightforward.Step 1. We connect to TRP and retrieve 20 HTTPS flows for IP 192.168.1.105 for the entire time interval available. The message used here is KeySessionActivity (give me all flows by IP and/or Port) # send request for sessions for keyreq = TrisulRP::Protocol.mk_request(TRP::Message::Command::KEY_SESS_ACTIVITY_REQUEST, :key => target_ip , :key2 => target_port , :maxitems => 20 , :time_interval => mk_time_interval(tmarr)) Step 2 : For each flow in the response, pull the packets out of Trisul. The message used here is FiltereredDatagramsRequest for each flow. Note we have capped the :max_bytes at 20,000. We use a trick here, we only retrieve the first 20K bytes of each flow because the Server Certificate is usually exchanged at the very beginning of a SSL session. This dramatically reduces the data transferred. # get response and print session detailsTrisulRP::Protocol.get_response(conn,req) do |resp| resp.sessions.each do |sess| get_packets = TrisulRP::Protocol.mk_request(TRP::Message::Command::FILTERED_DATAGRAMS_REQUEST, :max_bytes => 20000, :session => ... The full code is available as csx.rb from the TRP Samples. Virus-free and 100% clean download. Get Unsniff Network Analyzer alternative downloads. Free alternatives to Unsniff Network Analyzer 1.8 for Windows. Unsniff Network

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We just released a new build (R.1.5.1.1239) of Unbrowse SNMP with major updates to the MIB Walker (also known as MIB Browser in other products).This is a FREE update to all current customers. Please download the latest version from here.Lets take a quick tour of the new features1. Enhanced user interface (see above)To access this functionality : Right click on the tab sheet If you are dealing with a MIB walk containing, say 100+ tables, clicking the sheet tabs quickly gets cumbersome.(See screenshot above). We added a menu which allows you to quickly navigate to the desired sheet. The tables are sorted in alphabetical order and even show the number of rows present in the walk. This menu does not appear if there are just a dozen or so tables.2. SNMPWALK import more tolerant to input formatsThis is one of the commonly used features of Unbrowse SNMP. It interprets text dumps from snmpwalk tools like Cisco, Juniper, Net-SNMP into a fully OID-to-name resolved spreadsheet like interface. Saves you tons of time and hair pulling.  See here for more details about this feature.In this release, we add an option for interpreting any bunch of hex strings as human readable ( See Tools->Customize->Advanced->Tools and check the “SNMPWALK Import : Make Hex Strings human readable” option)Unbrowse SNMP can also now handle broken lines, inconsistent BITS datatypes, and large files.3. Option to quickly open the MIB definition of any tableJust right click any sheet and select “Show Definition”.4. Option to export a selected sheet as HTML or CSVRight click on any sheet and select “Export as HTML” or “Export as CSV”. This allows you to only export a single sheet in a large MIB walk.5. Option to export numeric OIDs instead of object namesBy default, Unbrowse resolves all OIDs using the MIBs installed. Now you can export a MIB walk and see OIDs instead of names in the HTML output. To enable this use Tools->Customize->Advanced-> Scroll down to the Walker group, then check the “Export OIDs instead of names to HTML” option (see screenshot above)Various other minor bugs reported by users have been fixed in this build.Download it now from MIB Walking 🙂We wish to thank a very cooperative customer (David Smith) for his help with major parts of this release. Vivek Rajagopalan is the a lead developer for Trisul Network Analytics. Prior products were Unsniff Network Analyzer and Unbrowse SNMP. Loves working with packets , very high speed networks, and helping track down the bad guys on the internet. View all posts by Vivek Rajagopalan