title: Findstr GPP Passwords
id: 91a2c315-9ee6-4052-a853-6f6a8238f90d
status: test
description: Look for the encrypted cpassword value within Group Policy Preference files on the Domain Controller. This value can be decrypted with gpp-decrypt.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.006/T1552.006.md#atomic-test-1---gpp-passwords-findstr
author: frack113
date: 2021-12-27
modified: 2023-11-11
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\find.exe'
              - '\findstr.exe'
        - OriginalFileName:
              - 'FIND.EXE'
              - 'FINDSTR.EXE'
    selection_cli:
        CommandLine|contains|all:
            - 'cpassword'
            - '\sysvol\'
            - '.xml'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_findstr_gpp_passwords/info.yml
simulation:
    - type: atomic-red-team
      name: GPP Passwords (findstr)
      technique: T1552.006
      atomic_guid: 870fe8fb-5e23-4f5f-b89d-dd7fe26f3b5f

title: LSASS Process Reconnaissance Via Findstr.EXE
id: fe63010f-8823-4864-a96b-a7b4a0f7b929
status: test
description: Detects findstring commands that include the keyword lsass, which indicates recon actviity for the LSASS process PID
references:
    - https://blog.talosintelligence.com/2022/08/recent-cyber-attack.html?m=1
author: Florian Roth (Nextron Systems)
date: 2022-08-12
modified: 2024-06-04
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection_findstr_img:
        - Image|endswith:
              - '\find.exe'
              - '\findstr.exe'
        - OriginalFileName:
              - 'FIND.EXE'
              - 'FINDSTR.EXE'
    selection_findstr_cli:
        CommandLine|contains: 'lsass'
    selection_special:
        CommandLine|contains|windash:
            - ' /i "lsass'
            - ' /i lsass.exe'
            - 'findstr "lsass'
            - 'findstr lsass'
            - 'findstr.exe "lsass'
            - 'findstr.exe lsass'
    condition: all of selection_findstr_* or selection_special
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_findstr_lsass/info.yml

title: Access To Potentially Sensitive Sysvol Files By Uncommon Applications
id: d51694fe-484a-46ac-92d6-969e76d60d10
related:
    - id: 8344c19f-a023-45ff-ad63-a01c5396aea0
      type: derived
status: test
description: Detects file access requests to potentially sensitive files hosted on the Windows Sysvol share.
references:
    - https://github.com/vletoux/pingcastle
author: frack113
date: 2023-12-21
modified: 2024-07-29
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: file_access
    product: windows
    definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider'
detection:
    selection:
        FileName|startswith: '\\'
        FileName|contains|all:
            - '\sysvol\'
            - '\Policies\'
        FileName|endswith:
            - 'audit.csv'
            - 'Files.xml'
            - 'GptTmpl.inf'
            - 'groups.xml'
            - 'Registry.pol'
            - 'Registry.xml'
            - 'scheduledtasks.xml'
            - 'scripts.ini'
            - 'services.xml'
    filter_main_generic:
        Image|startswith:
            - 'C:\Program Files (x86)\'
            - 'C:\Program Files\'
            - 'C:\Windows\system32\'
            - 'C:\Windows\SysWOW64\'
    filter_main_explorer:
        Image: 'C:\Windows\explorer.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

title: Permission Misconfiguration Reconnaissance Via Findstr.EXE
id: 47e4bab7-c626-47dc-967b-255608c9a920
status: test
description: |
    Detects usage of findstr with the "EVERYONE" or "BUILTIN" keywords.
    This was seen being used in combination with "icacls" and other utilities to spot misconfigured files or folders permissions.
references:
    - https://www.absolomb.com/2018-01-26-Windows-Privilege-Escalation-Guide/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-12
modified: 2023-11-11
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection_findstr_img:
        - Image|endswith:
              - '\find.exe'
              - '\findstr.exe'
        - OriginalFileName:
              - 'FIND.EXE'
              - 'FINDSTR.EXE'
    selection_findstr_cli:
        CommandLine|contains:
            - '"Everyone"'
            - "'Everyone'"
            - '"BUILTIN\\"'
            - "'BUILTIN\\'"
    selection_special:
        CommandLine|contains|all:
            # Example CLI would be: icacls "C:\Program Files\*" 2>nul | findstr "(M)" | findstr "Everyone"
            # You could extend it for other groups and users
            #   Example: icacls "C:\Program Files\*" 2>nul | findstr "(M)" | findstr "BUILTIN\Users"
            # Note: This selection only detects the command when executed from a handler such as a "cmd /c" or "powershell -c"
            - 'icacls '
            - 'findstr '
            - 'Everyone'
    condition: all of selection_findstr_* or selection_special
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_findstr_recon_everyone/info.yml

title: Suspicious SYSVOL Domain Group Policy Access
id: 05f3c945-dcc8-4393-9f3d-af65077a8f86
status: test
description: Detects Access to Domain Group Policies stored in SYSVOL
references:
    - https://adsecurity.org/?p=2288
    - https://www.hybrid-analysis.com/sample/f2943f5e45befa52fb12748ca7171d30096e1d4fc3c365561497c618341299d5?environmentId=100
author: Markus Neis, Jonhnathan Ribeiro, oscd.community
date: 2018-04-09
modified: 2022-01-07
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '\SYSVOL\'
            - '\policies\'
    condition: selection
falsepositives:
    - Administrative activity
level: medium