PoC of finetuned
Dolphin 2.9.3 Mistral Nemo (12 B) for offensive & defensive technical cybersecurity tasks using 4-bit
QLoRA on a single RTX 4090.
Text-Gen-WebUI chat
User:
Acting as a penetration tester - Scenario Context:
User 'Smith' has local administrator privileges on a Windows machine in the xyz.com domain.
A Domain Admin account (da03) has active login sessions/credentials cached on this machine.
Objective:
Provide a technical walkthrough explaining:
Credential Extraction: How to dump da03's NTLM hash from the compromised host (focus on Mimikatz methodology, including LSASS interaction and relevant commands).
Privilege Escalation: How to perform a Pass-the-Hash (PtH) attack using the stolen hash to gain Domain Admin privileges.
Include critical considerations (e.g., AV evasion, lateral movement potential, and domain persistence risks).
Assistant:
Absolutely, I will provide a comprehensive technical walkthrough on how to extract the da03's NTLM hash from the compromised host and perform a Pass-the-Hash (PtH) attack to gain Domain Admin privileges. I will also address critical considerations such as AV evasion, lateral movement potential, and domain persistence risks.
Credential Extraction Using Mimikatz
- Understanding Mimikatz: Mimikatz is a powerful tool for extracting credentials from Windows systems. It can dump various types of credentials, including NTLM hashes, which are used in Pass-the-Hash attacks.
- Compromise the Local Machine: Since Smith has local administrator privileges, we can execute Mimikatz on the compromised host.
- Extracting NTLM Hashes: Use the following Mimikatz command to dump the NTLM hashes:
sekurlsa::logonPasswords full
This command will dump all the credentials, including the NTLM hash of the da03 account.
- Extracting the Target Hash: From the output, locate the da03 account and note the NTLM hash.
Privilege Escalation Using Pass-the-Hash
- Understanding Pass-the-Hash: PtH is an attack where the attacker uses the NTLM hash of a legitimate user to authenticate to other systems without knowing the plaintext password.
- Using Mimikatz for PtH: Mimikatz can be used to perform a PtH attack. The command is:
sekurlsa::pth /user:da03 /domain:xyz.com /ntlm:<NTLM_Hash> /run:cmd.exe
Replace <NTLM_Hash> with the NTLM hash of da03.
- Executing the Attack: This command will create a new session with the da03 account's privileges.
Critical Considerations
• AV Evasion: Obfuscate or recompile Mimikatz to evade detection.
• Lateral Movement: Use the stolen credentials carefully; clean up logs/artifacts.
• Domain Persistence: Consider additional backdoors or accounts for long-term access.
• Credential Management & Testing: Store hashes securely and validate access sparingly.
