John the Ripper/Rules

Using Rules with John

Download an excellent set of John the Ripper rules from KoreLogic security here: http://openwall.info/wiki/_media/john/korelogic-rules-20100801.txt

Based on the 2010 Defcon Crack Me If You Can contest.

Install the Rules

To install the rules, download that text file. Now run this command to add those rules to John's configure file:

$ cat korelogic-rules-20100801.txt >> /etc/john/john.conf

Using Rules

Now you can use any of the rules that are listed here (http://contest-2010.korelogic.com/rules.html) or that you see in the form of [List.Rules:KoreLogicRulesPrependSeason] in the rules file (just get rid of the List.Rules: part.)

$ john --wordlist=rockyou-10.txt --format=wpapsk --rules=KoreLogicRulesPrependYears crackme

List All the Rules

Here's a one-liner to list all the commands in the configuragion file, by grepping and cutting. Remember that each one of these options could have thousands of password variations that result!

$ for ruleset in `grep KoreLogicRules /etc/john/john.conf | cut -d: -f 2 | cut -d\] -f 1`; do echo ${ruleset}; done
KoreLogicRulesPrependSeason
KoreLogicRulesAppendSeason
KoreLogicRulesPrependHello
KoreLogicRulesPrependYears
KoreLogicRulesAppendYears
KoreLogicRulesAppendCurrentYearSpecial
KoreLogicRulesAppend4Num
KoreLogicRulesAppend5Num
KoreLogicRulesAppend6Num
KoreLogicRulesAppendSpecial3num
KoreLogicRulesAppendSpecial4num
KoreLogicRulesPrependCAPCAPAppendSpecial
KoreLogicRulesPrependNumNumAppendSpecial
KoreLogicRulesPrependNumNum
KoreLogicRulesPrependNumNumNum
KoreLogicRulesPrependNumNumNumNum
KoreLogicRulesPrependNumNumSpecial
KoreLogicRulesPrepend2NumbersAppend2Numbers
KoreLogicRulesPrependSpecialSpecial
KoreLogicRulesAppendSpecialNumberNumber
KoreLogicRulesAppendSpecialNumberNumberNumber
KoreLogicRulesPrependSpecialSpecialAppendNumber
KoreLogicRulesPrependSpecialSpecialAppendNumbersNumber
KoreLogicRulesPrependSpecialSpecialAppendNumbersNumberNumber
KoreLogicRulesAppend2Letters
KoreLogicRulesPrepend4NumAppendSpecial
KoreLogicRulesAppend4NumSpecial
KoreLogicRulesAppend3NumSpecial
KoreLogicRulesAppend2NumSpecial
KoreLogicRulesAddJustNumbersLimit8
KoreLogicRulesDevProdTestUAT
KoreLogicRulesPrependAndAppendSpecial
KoreLogicRulesAppendJustNumbers
KoreLogicRulesAppendNumbers_and_Specials_Simple
KoreLogicRulesAppendJustSpecials
KoreLogicRulesMonthsFullPreface
KoreLogicRulesAddShortMonthsEverywhere
KoreLogicRulesPrepend4LetterMonths
KoreLogicRulesAdd2010Everywhere
KoreLogicRulesPrependDaysWeek
KoreLogicRulesAdd1234_Everywhere
KoreLogicRulesAppendMonthDay
KoreLogicRulesAppendMonthCurrentYear
KoreLogicRulesReplaceNumbers2Special
KoreLogicRulesReplaceNumbers
KoreLogicRulesReplaceLettersCaps
KoreLogicRulesAddDotCom
KoreLogicRulesAppendCap-Num_or_Special-Twice
KoreLogicRulesAppendSpecialLowerLower
KoreLogicRulesAppendJustSpecials3Times
KoreLogicRulesPrependJustSpecials
KoreLogicRulesAppend1_AddSpecialEverywhere
KoreLogicRulesPrependNumNum_AppendNumSpecial
KoreLogicRulesAppendNum_AddSpecialEverywhere
KoreLogicRulesAppendNumNum_AddSpecialEverywhere
KoreLogicRulesAppendNumNumNum_AddSpecialEverywhere
KoreLogicRulesAppendYears_AddSpecialEverywhere
KoreLogicRulesL33t
KoreLogicRulesReplaceSpecial2Special
KoreLogicRulesReplaceLetters

Use All the Rules

This is overkill, but it extracts every rule from the KoreLogic rule list and runs john with every one of those rules. From the full list here http://contest-2010.korelogic.com/rules.html you can see that'll take a loooooooong time. But this would be handy to use with grep to filter out some of the rule names.

$ for ruleset in `grep KoreLogicRules /etc/john/john.conf | cut -d: -f 2 | cut -d\] -f 1`; do john --wordlist=rockyou-10.txt --format=wpapsk --rules=${ruleset} crackme; done

A nice subset:

$ grep KoreLogicRules /etc/john/john.conf | cut -d: -f 2 | cut -d\] -f 1 | grep Year | grep -v Special
KoreLogicRulesPrependYears
KoreLogicRulesAppendYears
KoreLogicRulesAppendMonthCurrentYear

Put into use:

$ for ruleset in `grep KoreLogicRules /etc/john/john.conf | cut -d: -f 2 | cut -d\] -f 1 | grep Year | grep -v Special`; do john --wordlist=rockyou-10.txt --format=wpapsk --rules=${ruleset} crackme; done

Other Wiki Pages

Also on the wiki:

More information about how to do password generation using wordlists and the KoreLogic rules, as well as writing your own rules: John the Ripper/Password Generation