![]() ![]() However, configuring this policy does not remove existing LM hashes. If the Active Directory domain was created before this change was implemented (on Server 2003 or before), it will still store LM hashes, unless a specific Group Policy setting is configured to prevent the storage of LM hashes. This means that in a modern environment there should only be LM hashes stored on local systems, but Active Directory makes this a bit more complicated. Windows stored both LM and NTLM hashes by default until Windows Vista/Server 2008, from which point only NTLM hashes were stored (along with the empty LM hash AAD3B435B51404EEAAD3B435B51404EE). These, and the fact that the LM algorithm is relatively fast and does not use salts, means that almost any LM hash can be cracked using brute-force or rainbow table attacks in a matter of hours (often minutes or seconds), on commodity hardware. This means that cracking a 14 character password is twice as hard as cracking a 7 character password, rather than being billions of times harder as it would be with an algorithm that did not split the passwords. Secondly, and more importantly, the algorithm pads the password to 14 characters, and then splits it into two 7 character strings, which are hashed separately (using DES). Firstly, it is case insensitive, with all letters being converted to uppercase, which greatly reduces the possible keyspace. The LM hashing algorithm is very old, and is considered very insecure for a number of reasons. Windows stores passwords using two different hashing algorithms – LM (Lan Manager) and NTLM (NT Lan Manager). If you’re not interested in the background, feel free to skip this section. Hash Typesįirst a quick introduction about how Windows stores passwords in the NTDS.dit (or local SAM) files. Now we need to crack the hashes to get the clear-text passwords. ![]() #CRACK LM HASH NT HASH DECRYPT HOW TO#In part 1 we looked how to dump the password hashes from a Domain Controller using NtdsAudit. ![]()
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