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Gone are the days when we have to wait for the days together torecover the Windows account password. Thanks to thetechnology, now we can crack the passwords in few secondswith 100% success rate.This Rainbow cracking technology works on simple concept. Instead ofcomputing the hashes for each password dynamically and comparing withthe correct one during cracking, password hashes are computedin advance for all character sets. These hashes are then stored indatasets called rainbow tables.So cracking involves just comparing the current password hash withthe pre computedhashes within the rainbow tables and get the associated plain textpassword.
Hence it takes very less timecompared to the traditional method of brute force cracking. Setting up therainbow table for various character sets is just one time activity andmay take days or months based on the character set andspeed of the machine. Once the rainbow tables are ready, you can feedthe password hash to it and get your password cracked in seconds.Recovering Windows Account Password. In order to recover your Windows user password,first you have to get theLM hash for the target user account. This can be done in many ways. You canuse any of the tools such aspwdump,or. Youneed to have administrator privileges to dump the hashes using thesetools.
If youhave lost administrator password itself, then you can boot thesystem using live cd or Windows restore CD and then copy the SAM &SYSTEM hive files (which is located in c:windowssystem32configfolder. Note that your system drive may be different). Next feed thesefiles to tool to get the LM hashes for the target account.Here is the screenshot of retrieving LM hash for users using theCain&Abel tool. Once you have collected the LMpassword hash, you can start the password cracking operation usingthe rcrack tool (part of the)with the rainbow tables that you have already created for certaincharacter sets.Note that with Vista onwards Windows no longer stores LM hashes(unless under certain configurations) as it was susceptible toeasy brute force cracking.
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In such cases, you can as well use the NTLMhash to recover password with RainbowCrack.Ideally setting up the rainbow tables takes huge amount of disk spaceand lot of computing time to generate the tables. Hence its notpractical for anyone to create such an setup on the home system.Online Rainbow CrackingTo make the game eaiser, lot of websites ( including free aswell as commericial ) offer free online rainbow cracking service. Theseorganizations have setup huge database of rainbow tables for all keysetson their high end machines which makes the cracking possible in fewseconds.
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Also these services offer password cracking for different typeof hashes such as LM, NTLM, SHA, MD5 etc.For FREE services you may have to wait for some time based on the loadand incoming requests. However you may also look for commercial servicesfor quick results at smaller cost.If you are an organization who needs this kind of passwordrecovery service frequently then you can consider buying precomputed rainbowtables for reasonable price and perform the password cracking operation usingtool.