[Blackhash] Audit Passwords Without Hashes

A traditional password audit typically involves extracting password hashes from systems and then sending those hashes to a third-party security auditor or an in-house security team. These security specialists have the knowledge and tools to effectively audit password hashes. They use password cracking software such as John the Ripper and Hashcat in an effort to uncover weak passwords.

However, there are many risks associated with traditional password audits. The password hashes may be lost or stolen from the security team. A rogue security team member may secretly make copies of the password hashes. How would anyone know? Basically, once the password hashes are given to the security team, the system manager must simply trust that the password hashes are handled and disposed of securely and that access to the hashes is not abused.

Blackhash works by building a bloom filter from the system password hashes. The system manager extracts the password hashes and then uses Blackhash to build the filter. The filter is saved to a file, then compressed and given to the security team. The filter is just a bitset that contains ones and zeros. It does not contain the password hashes or any other information about the users or the accounts from the system. It’s just a string of ones and zeros. You may

view a Blackhash filter with a simple text editor. It will look similar to this:

00000100000001000100001

When the security team receives the filter, they use Blackhash to test it for known weak password hashes. If weak passwords are found, the security team creates a weak filter and sends that back to the system manager. Finally, the system manager tests the weak filter to identify individual users so that they can be contacted and asked to change passwords.

This enables you to audit passwords without actually giving out the hashes.

Pros

• Password hashes never leave the system team.
• Works with any simple, un-salted hash. LM, NT, MD5, SHA1, etc.
• Security auditors do not have to transmit, handle or safe-guard the password hashes.
• Anonymizes the users. The filter contains no data about the users at all.

Cons

• Slower than traditional password cracking methods.
• More complex than traditional password cracking methods.
• Bloom Filters may produce a few false positives (very few in this case).

Download Blackhash: Windows - Linux

[Hashcat v0.47] The world’s fastest CPU-based password recovery tool

Hashcat is the world’s fastest CPU-based password recovery tool.

While it’s not as fast as its GPU counterparts oclHashcat-plus and oclHashcat-lite, large lists can be easily split in half with a good dictionary and a bit of knowledge of the command switches.

Changelog v0.47

• added -m 123 = EPi
• added -m 1430 = sha256(unicode($pass).$salt)
• added -m 1440 = sha256($salt.unicode($pass))
• added -m 1441 = EPiServer 6.x >= v4
• added -m 1711 = SSHA-512(Base64), LDAP {SSHA512}
• added -m 1730 = sha512(unicode($pass).$salt)
• added -m 1740 = sha512($salt.unicode($pass))
• added -m 7400 = SHA-256(Unix)
• added -m 7600 = Redmine SHA1
• debug mode can now be used also together with -g, generate rule
• support added for using external salts together with mode 160 = HMAC-SHA1 (key = $salt)
• allow empty salt/key for HMAC algos
• allow variable rounds for hash modes 500, 1600, 1800, 3300, 7400 using rounds= specifier
• added –generate-rules-seed, sets seed used for randomization so rulesets can be reproduced
• added output-format type 8 (position:hash:plain)
• updated/added some hcchr charset files in /charsets, some new files: Bulgarian, Polish, Hungarian
• format output when using –show according to the –outfile-format option
• show mask length in status screen
• –disable-potfile in combination with –show or –left resulted in a crash, combination was disallowed

Features

• Multi-Threaded
• Free
• Multi-Hash (up to 24 million hashes)
• Multi-OS (Linux, Windows and OSX native binaries)
• Multi-Algo (MD4, MD5, SHA1, DCC, NTLM, MySQL, …)
• SSE2, AVX and XOP accelerated
• All Attack-Modes except Brute-Force and Permutation can be extended by rules
• Very fast Rule-engine
• Rules compatible with JTR and PasswordsPro
• Possible to resume or limit session
• Automatically recognizes recovered hashes from outfile at startup
• Can automatically generate random rules
• Load saltlist from external file and then use them in a Brute-Force Attack variant
• Able to work in an distributed environment
• Specify multiple wordlists or multiple directories of wordlists
• Number of threads can be configured
• Threads run on lowest priority
• Supports hex-charset
• Supports hex-salt
• 90+ Algorithms implemented with performance in mind
• …and much more

Download hashcat v0.47