Explain The Use Of Hashcat Token Length Exceptions.

374    Asked by DianeCarr in SQL Server , Asked on Aug 4, 2023

Is it possible to explain how the line length exception works in Hashcat? Hashcat refers to a password cracking tool meant for legal and illegal purposes. It is a fast, and well-built hacking device that supports brute-force attacks by executing them with hash values of passwords that the device implements. It can also expose compromised credentials as well. It is well-known for being deployed for nefarious objectives. Hackers use it to automate threats against passwords. It provides the capacity to brute-force credential stores utilizing familiar hashes, to execute dictionary threats and reverse engineer legible data on user behavior into hashed-password combination threats. 


Answered by Diane Carr

NTLM ashes must be segregated out into the LM and NTLM elements for hashcat to attack them.


$ cat lm.hashes
[lm-hash1]
[lm-hash2]
$ cat ntlm.hashes
[ntlm-hash1]
[ntlm-hash2]

 It can also be used by users deploying the username hashcat parameter as given below:

$ cat lm-users.hashes
user1:[lm-hash1]
user2:[lm-hash2]
$ cat ntlm-users.hashes
user1:[ntlm-hash1]
User2:[ntlm-hash2]

Hashcat throws the line-length exception error while hashcat gets anything that it attempted to translate to a hash, however the information received is not the assumed length for the requested hash type. While performing with hashcat command line, you may pass something that hashcat is assuming to be a hash, but it is not. This produces the error as mentioned-below.

The hashes are not of the common type. Hence, the hash length does not match the requested type. The best method to check is to try the same command against the respective instance hash in the hashcat example hashes list.

The hashes contain absurd characters at the end such as whitespace.

The given hashes have users and salts when they are not expected. You can give hashes in the username:hash. However hashcat cannot tell if string:string is indeed hash:salt. Due to any typo, you pass a non-hashes file as the initial unflagged parameter to hashcat. Also when you pass a file having various hashes on the command line, but the file is not present, this is due to a quirk in the way hashcat processes the command line. Hence, when you interpret the error as there is anything improper with your input, you must be capable of settling the line-length exception errors.

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