137 lines
4.1 KiB
YAML
137 lines
4.1 KiB
YAML
title: Weak Encryption Enabled and Kerberoast
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author: '@neu5ron'
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date: 2017/07/30
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description: Detects scenario where weak encryption is enabled for a user profile
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which could be used for hash/password cracking.
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detection:
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SELECTION_1:
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EventID: 4738
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SELECTION_10:
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OldUacValue: '*8???'
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SELECTION_11:
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OldUacValue: '*9???'
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SELECTION_12:
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OldUacValue: '*A???'
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SELECTION_13:
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OldUacValue: '*B???'
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SELECTION_14:
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OldUacValue: '*C???'
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SELECTION_15:
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OldUacValue: '*D???'
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SELECTION_16:
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OldUacValue: '*E???'
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SELECTION_17:
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OldUacValue: '*F???'
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SELECTION_18:
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NewUacValue: '*1????'
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SELECTION_19:
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NewUacValue: '*3????'
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SELECTION_2:
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NewUacValue: '*8???'
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SELECTION_20:
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NewUacValue: '*5????'
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SELECTION_21:
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NewUacValue: '*7????'
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SELECTION_22:
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NewUacValue: '*9????'
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SELECTION_23:
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NewUacValue: '*B????'
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SELECTION_24:
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NewUacValue: '*D????'
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SELECTION_25:
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NewUacValue: '*F????'
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SELECTION_26:
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OldUacValue: '*1????'
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SELECTION_27:
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OldUacValue: '*3????'
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SELECTION_28:
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OldUacValue: '*5????'
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SELECTION_29:
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OldUacValue: '*7????'
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SELECTION_3:
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NewUacValue: '*9???'
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SELECTION_30:
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OldUacValue: '*9????'
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SELECTION_31:
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OldUacValue: '*B????'
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SELECTION_32:
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OldUacValue: '*D????'
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SELECTION_33:
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OldUacValue: '*F????'
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SELECTION_34:
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NewUacValue: '*8??'
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SELECTION_35:
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NewUacValue: '*9??'
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SELECTION_36:
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NewUacValue: '*A??'
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SELECTION_37:
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NewUacValue: '*B??'
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SELECTION_38:
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NewUacValue: '*C??'
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SELECTION_39:
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NewUacValue: '*D??'
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SELECTION_4:
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NewUacValue: '*A???'
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SELECTION_40:
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NewUacValue: '*E??'
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SELECTION_41:
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NewUacValue: '*F??'
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SELECTION_42:
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OldUacValue: '*8??'
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SELECTION_43:
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OldUacValue: '*9??'
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SELECTION_44:
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OldUacValue: '*A??'
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SELECTION_45:
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OldUacValue: '*B??'
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SELECTION_46:
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OldUacValue: '*C??'
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SELECTION_47:
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OldUacValue: '*D??'
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SELECTION_48:
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OldUacValue: '*E??'
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SELECTION_49:
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OldUacValue: '*F??'
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SELECTION_5:
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NewUacValue: '*B???'
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SELECTION_6:
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NewUacValue: '*C???'
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SELECTION_7:
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NewUacValue: '*D???'
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SELECTION_8:
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NewUacValue: '*E???'
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SELECTION_9:
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NewUacValue: '*F???'
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condition: (SELECTION_1 and ((((SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5
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or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9) and not ((SELECTION_10
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or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14 or SELECTION_15
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or SELECTION_16 or SELECTION_17))) or ((SELECTION_18 or SELECTION_19 or SELECTION_20
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or SELECTION_21 or SELECTION_22 or SELECTION_23 or SELECTION_24 or SELECTION_25)
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and not ((SELECTION_26 or SELECTION_27 or SELECTION_28 or SELECTION_29 or
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SELECTION_30 or SELECTION_31 or SELECTION_32 or SELECTION_33)))) or ((SELECTION_34
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or SELECTION_35 or SELECTION_36 or SELECTION_37 or SELECTION_38 or SELECTION_39
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or SELECTION_40 or SELECTION_41) and not ((SELECTION_42 or SELECTION_43 or
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SELECTION_44 or SELECTION_45 or SELECTION_46 or SELECTION_47 or SELECTION_48
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or SELECTION_49)))))
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falsepositives:
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- Unknown
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id: f6de9536-0441-4b3f-a646-f4e00f300ffd
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level: high
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logsource:
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definition: 'Requirements: Audit Policy : Account Management > Audit User Account
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Management, Group Policy : Computer Configuration\Windows Settings\Security
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Settings\Advanced Audit Policy Configuration\Audit Policies\Account Management\Audit
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User Account Management'
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product: windows
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service: security
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references:
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- https://adsecurity.org/?p=2053
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- https://www.harmj0y.net/blog/activedirectory/roasting-as-reps/
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tags:
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- attack.defense_evasion
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- attack.t1089
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- attack.t1562.001
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yml_filename: win_alert_enable_weak_encryption.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/builtin
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