Beginner’s Guide to Conquering Infiltrator on HackTheBox

Key Highlights

• Discover the importance of conquering HackTheBox Infiltrator for beginners.
• Learn essential tools and resources required to prepare for the challenge.
• Understand the key steps involved in conquering Infiltrator successfully.
• Gain insights into conducting initial reconnaissance and exploiting vulnerabilities.
• Set up your environment for success in tackling the Infiltrator challenge.
• Find out the best approach for beginners to start their journey with HackTheBox.

Introduction

Embark on a journey to master the Infiltrator challenge on HackTheBox. Delve into the intricate world of hacking and hone your skills. Prepare to unravel the depths of cybersecurity through hands-on experience and problem-solving. Let’s kickstart your adventure into the realm of digital infiltration and conquer the Infiltrator challenge with finesse.

Understanding the Basics of HackTheBox Infiltrator

HackTheBox Infiltrator is a simulation that challenges users to employ their hacking skills in a controlled environment. This challenge imitates real-world scenarios, enhancing participants’ proficiency in penetration testing and vulnerability assessment. Infiltrator is particularly valuable for beginners as it offers a structured platform to practice and enhance their hacking capabilities through a series of progressively complex tasks.

What is HackTheBox Infiltrator?

HackTheBox Infiltrator is a challenging platform designed for cybersecurity enthusiasts to test their skills in a simulated environment. It offers various real-world scenarios that require critical thinking and technical expertise to solve.

Why is Infiltrator a critical challenge for beginners?

Infiltrator is a critical challenge for beginners on HackTheBox due to its complex network architecture and varied security measures. It requires a deep understanding of penetration testing methodologies, making it a significant learning curve for those new to cybersecurity.

Preparing for the Infiltrator Challenge

To excel in the Infiltrator challenge on HackTheBox, ensuring you have essential tools like Nmap, Burp Suite, and Metasploit is imperative. Familiarize yourself with network scanning, web application testing, and exploit frameworks. Create a controlled lab environment to practice, fine-tune your skills, and stay updated on the latest hacking techniques. Setting up a virtual machine to simulate real-world scenarios and understanding common vulnerabilities will boost your readiness for the challenge.

Essential Tools and Resources Needed

To excel at the Infiltrator challenge on HackTheBox, arm yourself with essential tools like Nmap for network reconnaissance, Wireshark for packet analysis, and Burp Suite for web application testing. Additionally, mastering scripting languages such as Python and Bash can enhance your effectiveness in identifying vulnerabilities and automating tasks. Familiarity with concepts like SQL injection and cross-site scripting is advantageous for tackling the complexities of the Infiltrator challenge.

Setting Up Your Environment for Success

To ensure success in conquering Infiltrator, your environment setup is crucial. Utilize tools like Nmap for network scanning, Nikto for web server vulnerability checks, and Burp Suite for intercepting and modifying traffic. Familiarize yourself with Kali Linux, a favorite among ethical hackers. Additionally, practice using virtual machines to create a safe testing ground. Customizing your workspace with preferred scripts and configurations will streamline your process. A well-prepared environment enhances efficiency and effectiveness in tackling the Infiltrator challenge.

Step-by-Step Guide to Conquering Infiltrator

Step-by-Step Guide to Conquering Infiltrator: To hack your way through Infiltrator on HackTheBox, begin with thorough reconnaissance. Identify vulnerabilities and exploit them to gain access. Utilize tools like Nmap for scanning and enumeration, and Metasploit for exploitation. Remember to document each step for reference. Stay persistent and methodical as you navigate through the challenges posed by Infiltrator. With a strategic approach, you can conquer this task successfully.

Initial Reconnaissance and Footprinting

Begin by conducting passive reconnaissance using tools like Shodan. Gather information on the target machine, identify open ports, and enumerate services running. Utilize tools such as Nmap to scan for vulnerabilities actively. Avoid aggressive scanning to stay undetected. Document all findings carefully for the next phase of the infiltration. Understanding the target’s infrastructure is crucial to exploit weaknesses effectively. This initial step sets the foundation for a successful infiltration before diving deeper into the challenge.

NMap Scan result:

From the NMap Result, we can infer the following:

Domain: http://infiltrator.htb

Host: DC01
NetBIOS Domain Name: INFILTRATOR

Ports and Services Overview:

• Port 53 (DNS – Simple DNS Plus):
• The presence of DNS services suggests potential for DNS enumeration or zone transfers.
• Port 80 (HTTP – Microsoft IIS 10.0):
• Hosting a web server, which could be an entry point for web application vulnerabilities. Consider using tools like Gobuster, Nikto, or Burp Suite for directory enumeration and vulnerability scanning.
• Ports 88, 464 (Kerberos):
• These ports indicate an Active Directory environment. Begin with user enumeration using tools like kerbrute or enum4linux. Assess for potential Kerberoasting attacks to extract service account tickets, which can be cracked offline.
• Ports 135, 593 (MSRPC):
• Used for Microsoft Remote Procedure Calls. Check for vulnerabilities such as remote code execution or misconfigurations that could be exploited.
• Ports 139, 445 (NetBIOS/SMB):
• Common ports for file sharing and SMB communication. Use smbclient, enum4linux, or smbmap to enumerate shares and test for anonymous access. Look for accessible file shares or misconfigurations that could reveal sensitive information.
• Ports 389, 636, 3268, 3269 (LDAP/SSL-LDAP):
• Critical for Active Directory. Use tools like ldapsearch or Windapsearch to query LDAP services. Focus on finding user accounts, group memberships, and organizational units that might be susceptible to attacks such as password spraying or exploitation of weak passwords.
• Port 3389 (RDP):
• Remote Desktop Protocol, a common target for unauthorized access. Check for weak credentials, potential for brute force attacks, or misconfigurations allowing unauthorized connections.

Recommended Actions:

1. User Enumeration: Use kerbrute or enum4linux to identify valid usernames.
2. SMB Enumeration: Check for accessible shares, misconfigurations, or files with sensitive data using smbclient and enum4linux.
3. LDAP Queries: Extract information about users, groups, and policies using ldapsearch or Windapsearch.
4. Kerberoasting: Capture service tickets to identify weak service account passwords.
5. RDP Brute Force: Test for weak RDP credentials while monitoring for lockout policies.

This approach targets potential vulnerabilities in Active Directory services, SMB shares, and other critical services.

Visiting infiltrator.htb gives us the following web page

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During your scan, you find that the target machine has opened ports 139 and 445, linked to SMB (Server Message Block). These ports are notorious for security flaws, potentially exposing the system to unauthorized access or control. With these new attack vectors in sight, it’s time to exploit these vulnerabilities and take your next step.

[ays_block id=’1′]

First, let’s use enum4linux to detect if there is any information disclosure:

enum4linux -a infiltrator.htb

Unfortunately, we can see that none of them have permission.

Upon revisiting the web page, we uncover several usernames scattered across the site. This discovery sparks a new line of thought—could these usernames be the key to accessing the system through SMB? With the right password, these accounts might be exploitable via SMB blasting, opening up another potential avenue for attack. It’s time to put these usernames to the test and see if they can crack the system.

I found a total of 7 usernames:

David Anderson
Olivia Martinez
Kevin Turner
Amanda Walker
Marcus Harris
Lauren Clark
Ethan Rodriguez

Let’s use Kerbrute.

Kerbrute Result

Using kerbute

./kerbrute userenum -d "infiltrator.htb" username.txt --dc "dc01.infiltrator.htb"

Unfortunately, none of them worked.

Trying a different username combination

username@infiltrator.htb

With that, the new usernames become:

david.anderson@Infiltrator.htb
david_anderson@Infiltrator.htb
d.anderson@Infiltrator.htb
d_anderson@Infiltrator.htb
olivia.martinez@Infiltrator.htb
olivia_martinez@Infiltrator.htb
o.martinez@Infiltrator.htb
o_martinez@Infiltrator.htb
kevin.turner@Infiltrator.htb
kevin_turner@Infiltrator.htb
k.turner@Infiltrator.htb
k_turner@Infiltrator.htb
amanda.walker@Infiltrator.htb
amanda_walker@Infiltrator.htb
a.walker@Infiltrator.htb
a_walker@Infiltrator.htb
marcus.harris@Infiltrator.htb
marcus_harris@Infiltrator.htb
m.harris@Infiltrator.htb
m_harris@Infiltrator.htb
lauren.clark@Infiltrator.htb
lauren_clark@Infiltrator.htb
l.clark@Infiltrator.htb
l_clark@Infiltrator.htb
ethan.rodriguez@Infiltrator.htb
ethan_rodriguez@Infiltrator.htb
e.rodriguez@Infiltrator.htb
e_rodriguez@Infiltrator.htb

Using Kerbrute with the new username format now yields positive results

To identify users who do not require Kerberos pre-authentication, we can first gather a list of all existing usernames on the system using a tool like getent passwd. Then, we can employ GetNPUsers with appropriate switches to filter out users who do require Kerberos pre-authentication. By comparing the output of GetNPUsers with the list of existing users, we can pinpoint those who do not necessitate Kerberos pre-authentication. The resulting list can be saved to a file or displayed on the console for further analysis or action.

impacket-GetNPUsers infiltrator.htb/ -usersfile users.txt -outputfile output.txt -dc-ip dc01.infiltrator.htb -no-pass

To obtain the hash value associated with the user “l.clark,” it’s important to note that the corresponding hash pattern is 18200. Using this pattern, you can leverage Hashcat, a powerful password-cracking tool, to perform a brute-force attack and crack the hash value efficiently.

After obtaining the user password, you should rerun enum4linux to gather more information, taking advantage of the credentials for potentially deeper access. Additionally, consider performing password spraying using the acquired credentials to test for other accounts with similar or reused passwords, as this might reveal further access points or vulnerabilities within the system.

Password spraying is a type of cyberattack in which an attacker attempts to gain unauthorized access to multiple user accounts by systematically trying a small number of commonly used passwords across a wide range of accounts. Unlike traditional brute-force attacks, where a single account is targeted with numerous password attempts, password spraying avoids locking out accounts by limiting the number of guesses per account. This technique is particularly effective against organizations with many users, as it exploits weak password policies and the tendency of users to choose easily guessable passwords. By spreading the attack across multiple accounts, the attacker reduces the chances of detection and increases the likelihood of success.

crackmapexec smb [ip] -u unames.txt -p [passwd]

It was discovered that the password used by the user with the username d.anderson is identical to this password.

Now, let’s look at the users in details.

D.Anderson

The user d.anderson holds GenericAll permissions on the MARKETING DIGITAL account. However, due to prior constraints, this user cannot log in directly, and the account permissions are tightly controlled. The goal of this step is to escalate the privileges of d.anderson to gain full control over the MARKETING DIGITAL account.

To achieve this, we first need to obtain d.anderson’s Ticket Granting Ticket (TGT). The TGT is essential as it serves as an authentication token that allows the user to request service tickets for accessing resources within the domain. By acquiring the TGT, we can leverage the GenericAll permissions to perform privileged actions on the MARKETING DIGITAL account.

Once the TGT is obtained, we can utilize the GenericAll permissions to modify the access controls of the MARKETING DIGITAL account. This privilege escalation will allow us to grant d.anderson full control over the account, effectively bypassing any previous restrictions imposed on direct access. This step is crucial for advancing our access within the environment and gaining control over critical resources, further enhancing d.anderson’s overall privileges within the domain.

E.RODRIGUEZ

Since the user e.rodriguez is a member of the Digital Marketing group, d.anderson has full control over this group and can directly change its password. This administrative access allows d.anderson to manage group settings, including resetting or updating passwords when necessary.

However, please note that due to the organization’s strict password policy, any password changes need to be executed promptly after the preceding step. Delays in this process may trigger an error, preventing successful completion of the task. It’s essential to ensure that all actions are performed in quick succession to avoid any policy enforcement issues that might disrupt the operation.

In the previous step, we successfully updated the password for the user account belonging to e.rodriguez. This change was necessary to enhance account security and maintain compliance with the latest security protocols. As part of the user management process, e.rodriguez will also be assigned to the “Chiefs Marketing” group, reflecting their role within the organization. This addition grants them the necessary permissions and access to resources required to perform their duties effectively.

M.Harris

After adding e.rodriguez to the Chiefs Marketing group, it was observed that the group now has the ability to forcefully change the password of m.harris. This implies that, by assuming the identity of e.rodriguez, we can exploit this permission to reset the password of m.harris. We perform the same steps as above to change the password quickly.

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Gaining Access to the Machine and the Flags

After successfully completing the operation, a prompt confirms that the password has been changed successfully. The next step is to export the certificate, which is essential for the authentication process. Once the certificate is exported, you can proceed to log in using Evil-WinRM, a powerful post-exploitation tool that allows for remote command execution on Windows systems.

Evil-WinRM is particularly useful for gaining shell access, conducting further enumeration, and exploiting potential vulnerabilities on compromised Windows hosts. By utilizing the exported certificate during the login process, you can establish a secure session, allowing you to maintain access and perform necessary tasks with elevated privileges.

The KDC (Key Distribution Center) for the domain INFILTRATOR.HTB could not be located, which indicates a configuration issue on your local machine. To resolve this, you need to modify the /etc/krb5.conf configuration file.

This file is critical for Kerberos authentication and specifies the details of your realm, including the KDC and admin server. Ensure that the INFILTRATOR.HTB realm is properly configured within this file, and verify that the KDC and admin server entries are correctly set to point to the appropriate IP address or hostname of your domain controller.

For example, your /etc/krb5.conf file should contain an entry similar to the following:

[realms]
    INFILTRATOR.HTB = {
        kdc = your.kdc.address
        admin_server = your.admin.server.address
    }

Make sure to replace your.kdc.address and your.admin.server.address with the actual addresses of the KDC and admin server for the INFILTRATOR.HTB domain. Once modified, restart any relevant services to apply the changes and attempt to locate the KDC again.

[libdefaults]
    default_realm = INFILTRATOR.HTB
    dns_lookup_realm = false
    dns_lookup_kdc = false
    forwardable = true
[realms]
    INFILTRATOR.HTB = {
        kdc = dc01.infiltrator.htb
        admin_server = dc01.infiltrator.htb
    }
[domain_realm]
    .infiltrator.htb = INFILTRATOR.HTB
    infiltrator.htb = INFILTRATOR.HTB

After logging in as a user, you can leverage Metasploit Framework (msf) to gain a new shell on the target system. This tool provides a range of post-exploitation modules that allow for further system enumeration and control, making it a powerful ally in your penetration testing arsenal.

To assess the system’s vulnerabilities more effectively, upload WinPEAS (Windows Privilege Escalation Awesome Script). This tool is designed to automate the process of identifying common privilege escalation vectors on Windows systems, such as misconfigurations, outdated software, or vulnerable services. By running WinPEAS, you can quickly gather crucial information about the target’s security posture, highlighting potential weaknesses that can be exploited to elevate your privileges or pivot within the network.

I discovered a my.ini file belonging to the Output Messenger Server component and attempted to access it. However, I was immediately prompted with a message indicating that I did not have the necessary permissions to view or modify the file.

This restriction suggests that access to the my.ini file is tightly controlled, likely due to the sensitive configuration details it contains, such as server settings, database credentials, or other critical parameters. These files are typically protected to prevent unauthorized access, which could compromise the server’s security and stability.

To proceed, it would be essential to evaluate the permissions and ownership of the file. Checking if you have the right administrative privileges or if adjustments need to be made by a system administrator could be necessary steps.

There is a SQL configuration file that specifies the database’s port, along with the username and password required for access. To securely connect to this database, you can use Chisel to create a proxy tunnel, forwarding the remote database port to your local machine. This allows you to interact with the database as if it were running locally, bypassing network restrictions and adding an extra layer of security to your connection. By setting up this proxy, you gain seamless and secure access to the database without directly exposing sensitive credentials.

Unexpectedly, an SQL command was executed to read the contents of root.txt. Please use an appropriate SQL statement to perform this read operation. Make sure the command is structured correctly to retrieve the file’s contents from the database. Double-check your SQL syntax and confirm that you have the necessary permissions to access the file.

[/ays_block]

Exploiting Found Vulnerabilities

Exploiting Found Vulnerabilities: Employ your acquired knowledge to capitalize on identified weaknesses in the system. This phase demands precision and ingenuity to maneuver through the breach successfully, leveraging any security gaps discovered during the reconnaissance phase. Execute strategic maneuvers to gain control and access deeper into the system. This is where your prowess in hacking skills truly shines, as you navigate through the network using the vulnerabilities to your advantage. Stay vigilant and adapt to the evolving challenges presented by the Infiltrator.

Conclusion

Congratulations on completing the Infiltrator challenge on HackTheBox! By mastering this task, you have refined your hacking skills and gained valuable experience in navigating complex security systems. Remember, every hack is an opportunity to learn and grow. Stay curious, keep exploring, and continue honing your cybersecurity expertise. Good luck on your next hacking adventures!

Frequently Asked Questions

What is the best way for a beginner to start with HackTheBox?

To start with HackTheBox as a beginner, focus on completing easier challenges like Infiltrator. Engage in the HTB community, watch walkthroughs, and practice essential hacking skills. Build a solid foundation before tackling more complex challenges.