Today, we’ll be continuing with our walkthrough series on interesting Vulnhub machines. In this article we will see a walkthrough of the Tr0ll: 1 virtual machine.

Note: For all these machines, I have used VMware Workstation to provision the VMs. Kali Linux VM will be my attacking box. Also, remember the techniques used are solely for educational purposes. I am not responsible if the listed techniques are used against any other targets.

Tr0ll: 1 Details

Download Tr0ll: 1 here.

VM Description

  • Tr0ll was inspired by the constant trolling of the machines within the OSCP labs.
  • The goal is simple, gain root and get Proof.txt from the /root directory.
  • Not for the easily frustrated! Fair warning, there be trolls ahead!

Walkthrough

  1. Download the Vulnix VM from above link and provision it as a VM.
  2. Following the routine from this series, let’s try to find the IP of this machine using Netdiscover. Below, we can see our results: the IP address is found as 192.168.213.129.

  1. As we have done in the past, let’s run Nmap scans on the target server to get more information about it.

  2. We can see that below that the Nmap finds port 80 open, with exposed robots.txt and FTP with anonymous login (there were others as well, like Port 22-SSH). Wow, we are in for a treat! (Or some trolls. Let’s find out.)



  1. Following the leads from Nmap, let’s start enumerating the open services. Let’s start with Nmap.
  2. Connecting to FTP client as shown below with anonymous.

  3. Looking into the present directory, we found out that there is a file called lol.pcap. The name of the file gives an indication what to expect and matches the characteristics of the box.

  1. Analyzing the file in Wireshark presents an interesting text as shown below. There is some fun and text sup3rs3cr3tloldir. Interesting. (We make note of it.)
  2. With nothing more do in FTP, let’s retrace another bit of juicy info from Nmap: port 80 with robots.txt (with the belief that everything in the box is there for a reason).

  1. Before we directly jump to robots.txt, let’s see what we’ve got in the home page. All we got is below. Trolled.

  2. Browsing to robots.txt reveals a directory secret, as shown below.

  1. Browsing to the directory, we get this. Trolled again.

  1. What to do next? Remember we got a name in step 8. Let’s see if we can actually browse to that directory. Yes, we got a hit! And it has a file named roflmao.

  1. Downloading the file and checking its type, we could see that it is a 32-bit ELF executable.

  1. Performing some static analysis on it using strings, we can see an interesting string embedded in the executable. Like “Find address 0x0856BF to proceed.”

    Remember: sometimes simple binary analysis like strings can reveal a lot of interesting details.

  2. Following the leads, I tried browsing to that as a directory and we got a hit as well, as we can see below.
  3. We got two folders: good_luck (contains file which_one_lol.txt) and this_folder_contains_password (pass.txt).

Mobile Device Penetration Testing

  1. Below we can see the contents of both of these as well.

  1. How about we take one of these as the username? The other itself says that it has the password (if we trust the author for a bit).
  2. Inserting both of these values in Hydra, let’s see if we can get a hit on SSH service.

  1. And we get a hit! We can see it below.

  1. Without wasting more time, log into the server with the identified credentials.
  2. First thing to do is to look out for the OS version, like below.

  1. Though running exploits to escalate privileges should be the last resort, in this case I have taken this approach as we have already tried some other approaches in the previous articles of this series.
  2. Searching it through searchsploit, we can see that there is an exploit which matches the OS and kernel version both (37292.c).

  1. Below we can see that the exploit ID downloaded to the server.

  1. Compiling it locally and running it gives us root. Woohoo!

We win!

So this was Tr0ll: 1. It is very much beginner level, as it’s just the enumeration and browsing that we did above. There a sequel called Tr0ll: 2 as well, which I will cover in the next article.