nsldaps Hash

What is nsldaps?

The **NSLDAPS** hash format emerged as a proprietary extension of the legacy **NTLMv1** challenge-response mechanism, originally designed to secure authentication within Microsoft’s legacy **Network Service (NS) and Lightweight Directory Access Protocol (LDAP)** environments. Structurally, NSLDAPS hashes are derived from a hybrid of NTLMv1’s 128-bit hash and an additional 64-bit salt concatenated to the plaintext password before hashing, resulting in a 128-bit output (typically represented as a 32-character hexadecimal string). Unlike traditional NTLM, NSLDAPS was intended for LDAPS (LDAP over SSL/TLS) sessions to mitigate eavesdropping, though it retained the core flawed design of NTLMv1—namely, the lack of a cryptographically secure salt in its core hashing process. Its primary use-case was in legacy enterprise environments where NTLMv1 was already deployed, often as a transitional measure before migration to more secure protocols like Kerberos or modern hash formats (e.g., NTLMv2 or SHA-256-based schemes). The format’s reliance on MD4 for hashing and its absence of iterative hashing or key stretching made it inherently unsuitable for modern security standards, despite its TLS-layered encapsulation.

NSLDAPS hashes are vulnerable to cracking primarily due to their **combination of weak cryptographic primitives, predictable structures, and susceptibility to GPU-accelerated brute-force attacks**. The core MD4 hash function, which underpins the NSLDAPS derivation, is known to be vulnerable to collision attacks and suffers from poor avalanche effects, allowing attackers to exploit rainbow tables or precomputed hash databases (e.g., via tools like **Hashcat’s `ntlm` mode**) due to the absence of a per-password salt in the initial hashing phase. While the appended 64-bit salt mitigates *some* rainbow table attacks, it is applied post-hash and does not interact with the MD4 iteration, rendering it ineffective against brute-force or dictionary attacks. Additionally, the format’s reliance on **32-bit word operations** and lack of key stretching make it highly amenable to GPU-optimized cracking frameworks, which can evaluate millions of hashes per second. The absence of iterative hashing (e.g., as in bcrypt or PBKDF2) ensures that even a single correct guess yields the full hash in constant time, further exacerbating its vulnerability. Finally, the format’s legacy design—rooted in NTLMv1’s flaws—inherits its **no-salt-in-hash** weakness, making it trivially crackable when combined with leaked password databases, where attackers can precompute hashes for common passwords and compare them against stolen NSLDAPS hashes.

Identifying nsldaps Hashes

Identifying a hash blindly is often difficult because multiple algorithms can output strings of the exact same length. For example, a standard 32-character hexadecimal string could be MD5, NTLM, MD4, or LM. To definitively identify nsldaps, security researchers analyze the hash against a strict regular expression (regex) signature (shown above) to find structural matches.

How to Crack nsldaps

If you need to recover the plaintext password for a nsldaps hash during a penetration test or forensics investigation, you must supply the correct module ID to your cracking software. Use the exact commands provided at the top of this page to target the hash successfully.