PEH Course: Dumping and Cracking Hashes, Kerberoasting, Token Impersonation, LNK File, and GPP/cPassword Attacks

👉 This is what I’ve been working on the last three days:

✅ Dumping and Cracking Hashes

• Use `hashdump` in Meterpreter to extract hashes from a compromised system.
• Example command: `hashdump`
  – Crack hashes using John the Ripper: `john –format=NT hashes.txt`

✅ Kerberoasting Attacks

• Request service tickets using `GetUserSPNs.py` from Impacket.
• Example command: `GetUserSPNs.py -request -dc-ip domain/user`
  – Crack the extracted TGS tickets using hashcat: `hashcat -m 13100 -a 0 kerberoast.txt wordlist.txt`

✅ Token Impersonation Attacks

• Use `incognito` in Meterpreter to impersonate tokens.
• Example command: `use incognito` followed by `list_tokens -u` and `impersonate_token `

✅ LNK File Attacks

• Create malicious LNK files using tools like lnk.py.
• Example command: `python lnk.py -t -o malicious.lnk`

✅ GPP / cPassword Attacks

• Extract Group Policy Preferences (GPP) passwords using gpp-decrypt.
• Example command: `gpp-decrypt `

  💡 One thing I really love about the course is how Professor Adams explains in details the attacks and he also gives his mitigation strategies. He really arms each student with all information they need.

🔥 Next up, Mimikatz! 🔥

What Undercode Say

In the realm of cybersecurity, mastering offensive security techniques is crucial for understanding how to defend against them. The PEH course provides a comprehensive look into various attack vectors, including hash dumping, Kerberoasting, token impersonation, LNK file attacks, and GPP/cPassword attacks. Each of these techniques requires a deep understanding of both the attack methodology and the corresponding mitigation strategies.

For instance, hash dumping is a common technique used to extract password hashes from a compromised system. Tools like `hashdump` in Meterpreter and `John the Ripper` are essential for both extracting and cracking these hashes. Similarly, Kerberoasting exploits the Kerberos protocol to extract service account credentials, which can then be cracked offline using tools like hashcat.

Token impersonation is another critical technique, allowing attackers to assume the identity of other users on a system. This can be particularly devastating in environments with poor privilege separation. Tools like `incognito` in Meterpreter make this process straightforward, but proper logging and monitoring can help detect such activities.

LNK file attacks and GPP/cPassword attacks highlight the importance of securing seemingly innocuous files and configurations. Malicious LNK files can be used to execute arbitrary code, while GPP passwords, if not properly secured, can be easily decrypted using tools like gpp-decrypt.

To mitigate these attacks, it’s essential to implement strong password policies, regularly update and patch systems, and employ robust monitoring and logging mechanisms. Additionally, understanding and using tools like `Mimikatz` for post-exploitation activities can provide further insights into securing systems against advanced threats.

For further reading and resources, consider the following links:
– Impacket GitHub Repository
– John the Ripper Official Site
– Hashcat Official Site
– Mimikatz GitHub Repository

By continuously learning and practicing these techniques, cybersecurity professionals can stay ahead of attackers and better protect their systems and networks.

References:

Hackers Feeds, Undercode AI