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Blaster

A blast from the past!

Task 1: Mission Start!

Throughout this room, we'll be looking at alternative modes of exploitation without the use of Metasploit or really exploitation tools in general beyond nmap and dirbuster. To wrap up the room, we'll be pivoting back to these tools for persistence and additional steps we can take. Without further delay, let's deploy our lab machine!



Art by one of our members, Varg - THM Profile - Instagram - Blaster Merch - Twitter



This room is a remix of my previous room Retro with some complications I added to that room having been removed. For increased difficulty and an exercise in patience, check that room out after this. In addition, this room is the sequel to Ice. - DarkStar7471

Answer the questions below

  1. Deploy the machine! This is a Windows box so give it a few minutes (3-5 at max) to come online

Task 2: Activate Forward Scanners and Launch Proton Torpedoes

Now that we've launched our target, let's perform some basic enumeration of the services running on it!



Answer the questions below

  1. How many ports are open on our target system?

  2. Looks like there's a web server running, what is the title of the page we discover when browsing to it?

  3. Interesting, let's see if there's anything else on this web server by fuzzing it. What hidden directory do we discover?

  4. Navigate to our discovered hidden directory, what potential username do we discover?

  5. Crawling through the posts, it seems like our user has had some difficulties logging in recently. What possible password do we discover?

  6. Log into the machine via Microsoft Remote Desktop (MSRDP) and read user.txt. What are it's contents?

Task 3: Breaching the Control Room

Now that we've gained access to our target system, let's see if we can find a way to escalate. To start, let's scout around the system to see if we can find anything of interest.



Answer the questions below

  1. When enumerating a machine, it's often useful to look at what the user was last doing. Look around the machine and see if you can find the CVE which was researched on this server. What CVE was it?

  2. Looks like an executable file is necessary for exploitation of this vulnerability and the user didn't really clean up very well after testing it. What is the name of this executable?

  3. Research vulnerability and how to exploit it. Exploit it now to gain an elevated terminal!

  4. Now that we've spawned a terminal, let's go ahead and run the command 'whoami'. What is the output of running this?

  5. Now that we've confirmed that we have an elevated prompt, read the contents of root.txt on the Administrator's desktop. What are the contents? Keep your terminal up after exploitation so we can use it in task four!

Task 4: Adoption into the Collective

Now that we've thoroughly compromised our lab machine, let's return to our exploitation tools so that we can gain remote shell access and persistence.



Answer the questions below

  1. Return to your attacker machine for this next bit. Since we know our victim machine is running Windows Defender, let's go ahead and try a different method of payload delivery! For this, we'll be using the script web delivery exploit within Metasploit. Launch Metasploit now and select 'exploit/multi/script/web_delivery' for use.

  2. First, let's set the target to PSH (PowerShell). Which target number is PSH?
  3. After setting your payload, set your lhost and lport accordingly such that you know which port the MSF web server is going to run on and that it'll be running on the TryHackMe network.
  4. Finally, let's set our payload. In this case, we'll be using a simple reverse HTTP payload. Do this now with the command: 'set payload windows/meterpreter/reverse_http'. Following this, launch the attack as a job with the command 'run -j'.
  5. Return to the terminal we spawned with our exploit. In this terminal, paste the command output by Metasploit after the job was launched. In this case, I've found it particularly helpful to host a simple python web server (python3 -m http.server) and host the command in a text file as copy and paste between the machines won't always work. Once you've run this command, return to our attacker machine and note that our reverse shell has spawned. 

  6. Last but certainly not least, let's look at persistence mechanisms via Metasploit. What command can we run in our meterpreter console to setup persistence which automatically starts when the system boots? Don't include anything beyond the base command and the option for boot startup. 

  7. Run this command now with options that allow it to connect back to your host machine should the system reboot. Note, you'll need to create a listener via the handler exploit to allow for this remote connection in actual practice. Congrats, you've now gain full control over the remote host and have established persistence for further operations!

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Blaster

A blast from the past!

easy

30 min

41,947

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To access material, start machines and answer questions login.

Blaster Walkthrough| DarkStar •Jan 8, 2021
Source: YouTube

Set up your virtual environment

To successfully complete this room, you'll need to set up your virtual environment. This involves starting both your AttackBox (if you're not using your VPN) and Lab Machines, ensuring you're equipped with the necessary tools and access to tackle the challenges ahead.
Attacker machine
Status:Off
Lab machine
Status:Off

Throughout this room, we'll be looking at alternative modes of exploitation without the use of or really exploitation tools in general beyond and . To wrap up the room, we'll be pivoting back to these tools for and additional steps we can take. Without further delay, let's deploy our lab machine!



Art by one of our members, Varg -  Profile - Instagram - Blaster Merch - Twitter



This room is a remix of my previous room Retro with some complications I added to that room having been removed. For increased difficulty and an exercise in patience, check that room out after this. In addition, this room is the sequel to Ice. - DarkStar7471

Answer the questions below

Deploy the machine! This is a Windows box so give it a few minutes (3-5 at max) to come online

Now that we've launched our target, let's perform some basic enumeration of the services running on it!



Answer the questions below

How many ports are open on our target system?

Looks like there's a web server running, what is the title of the page we discover when browsing to it?

Interesting, let's see if there's anything else on this web server by fuzzing it. What hidden directory do we discover?

Navigate to our discovered hidden directory, what potential username do we discover?

Crawling through the posts, it seems like our user has had some difficulties logging in recently. What possible password do we discover?

Log into the machine via Microsoft Remote Desktop (MSRDP) and read user.txt. What are it's contents?

Now that we've gained access to our target system, let's see if we can find a way to escalate. To start, let's scout around the system to see if we can find anything of interest.



Answer the questions below

When enumerating a machine, it's often useful to look at what the user was last doing. Look around the machine and see if you can find the CVE which was researched on this server. What CVE was it?

Looks like an executable file is necessary for exploitation of this vulnerability and the user didn't really clean up very well after testing it. What is the name of this executable?

Research vulnerability and how to exploit it. Exploit it now to gain an elevated terminal!

Now that we've spawned a terminal, let's go ahead and run the command 'whoami'. What is the output of running this?

Now that we've confirmed that we have an elevated prompt, read the contents of root.txt on the Administrator's desktop. What are the contents? Keep your terminal up after exploitation so we can use it in task four!

Now that we've thoroughly compromised our lab machine, let's return to our exploitation tools so that we can gain remote shell access and .



Answer the questions below

Return to your attacker machine for this next bit. Since we know our victim machine is running Windows Defender, let's go ahead and try a different method of payload delivery! For this, we'll be using the script web delivery exploit within Metasploit. Launch Metasploit now and select 'exploit/multi/script/web_delivery' for use.

First, let's set the target to PSH (PowerShell). Which target number is PSH?
After setting your payload, set your lhost and lport accordingly such that you know which port the MSF web server is going to run on and that it'll be running on the TryHackMe network.
Finally, let's set our payload. In this case, we'll be using a simple reverse HTTP payload. Do this now with the command: 'set payload windows/meterpreter/reverse_http'. Following this, launch the attack as a job with the command 'run -j'.
Return to the terminal we spawned with our exploit. In this terminal, paste the command output by Metasploit after the job was launched. In this case, I've found it particularly helpful to host a simple python web server (python3 -m http.server) and host the command in a text file as copy and paste between the machines won't always work. Once you've run this command, return to our attacker machine and note that our reverse shell has spawned. 

Last but certainly not least, let's look at persistence mechanisms via Metasploit. What command can we run in our meterpreter console to setup persistence which automatically starts when the system boots? Don't include anything beyond the base command and the option for boot startup. 

Run this command now with options that allow it to connect back to your host machine should the system reboot. Note, you'll need to create a listener via the handler exploit to allow for this remote connection in actual practice. Congrats, you've now gain full control over the remote host and have established persistence for further operations!