Global Cyberlympics Finals 2015 Write-up - Tracker.7z

Hi all,

It has been a while since I updated this blog. Just want to share one of the challenges my team solved at the Cyberlympics finals held in Washington DC, USA.

Tools used: wireshark, chaosreader, vncviewer, tightVNC, online QR code scanner.

We were given a zipped pcap file - tracker.7z and asked to analyse it as it contains some information about a meeting location for a suspect in the whole storyline. We were to get the location of the meeting.

Well, we loaded the pcap into wireshark to have a first look at it. Screenshot below:

From the screenshot above, one can notice the VNC protocol being used during the capture, probably the suspect communicated with a remote person via VNC. So we need to reassemble the VNC session and see if that gives us any valuable information. A tool of choice, or probably the only tool I know that can do this is Chaosreader  by Brendan G. Gregg.
 

An index.html file is generated after run with chaosreader. The reassembled VNC session file should be seen as one of the output and is in the VNC.replay format.


The reassembled VNC session is seen as session_0038.VNC.replay. To playback the file, execute the following in a Linux terminal:

$./session_0038.VNC.replay -p 9991 1

this should start up a VNC server on port 9991, then connect to it by executing the following command on another terminal:

$vncviewer -viewonly 127.0.0.1:9991

When asked for password, just press enter any key.

This starts up the VNC client and connect to the server for playback.
At first, we did not notice that as the video was about to end, the suspect opened a picture which contained a QR code, this happened really fast. We noticed it the second time and had to make the playback to be three times slower so we could capture the QR Code.

$./session_0038.VNC.replay -p 9991 0.3    -- play three times slower



We uploaded the QR code to https://webqr.com/ and got a link.


Clicking on the link led to a location on Google Maps.


 
Location: McCormick & Schmick's Seafood & Steaks  !!! Onto the next one :)

Comments

  1. DOTCOMM26 October 2015 at 01:04

    Nice one. Learnt something new.

    ReplyDelete
  2. Anonymous27 October 2015 at 08:42

    Pytha, nice tutorial.

    ReplyDelete
  3. Unknown7 November 2016 at 05:12

    So finally whats the answer ? Is it the name of the place we have to submit as a flag ? Isn't there any actual flag out there ?

    ReplyDelete

Post a Comment

Popular posts from this blog

Pentesting Android applications

Image
Hi all, I would like to talk about the coolness of android applications. So if you want to perform a security review an android app, how will you go about it? There are so many ways to go about this, i will highlight some of the ways I use. 1) Most android applications work just like Web applications, they send out HTTP requests using POST and GET methods. So a cool thing to do is to intercept and capture these requests, make modifications and monitor responses (which can also be intercepted and modified). So how can this be done? A sweet way to achieve this is by proxying all traffic from the application on your phone through a proxy tool such as Burp Suite (coolest tool for me). Now how can you direct that phone traffic to your Burp Suite which is probably running on a laptop or system? Well, you can use a great android tool called "Proxy Droid" to direct the traffic to the IP address and port on which the burp suite is listening. You can connect them to the same wire...
Read more

Red Teaming with Covenant and Donut

Image
Red Teaming has rapidly transitioned from Living off the Land (LotL) to Bringing Your Own Land (BYOL). It is now possible to execute .NET assemblies entirely within memory. By developing custom C#-based assemblies, attackers no longer need to rely on the tools present on the target system; they can instead write and deliver their own tools, a technique called Bring Your Own Land (BYOL).  This has led to transitions from PowerShell tools (e.g. PowerShell Empire) to frameworks targeted for .NET assemblies. {shamelessly copied from  https://www.fireeye.com/blog/threat-research/2018/06/bring-your-own-land-novel-red-teaming-technique.html } About Covenant Covenant is a .NET command and control framework that aims to highlight the attack surface of .NET, make the use of offensive .NET tradecraft easier, and serve as a collaborative command and control platform for red teamers. Covenant is an ASP.NET Core, cross-platform application that includes a web-based ...
Read more