46 lines
1.4 KiB
YAML
46 lines
1.4 KiB
YAML
title: Change Default File Association
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author: Timur Zinniatullin, oscd.community
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date: 2019/10/21
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description: When a file is opened, the default program used to open the file (also
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called the file association or handler) is checked. File association selections
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are stored in the Windows Registry and can be edited by users, administrators,
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or programs that have Registry access or by administrators using the built-in
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assoc utility. Applications can modify the file association for a given file extension
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to call an arbitrary program when a file with the given extension is opened.
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detection:
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SELECTION_1:
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EventID: 1
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SELECTION_2:
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CommandLine: '*cmd*'
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SELECTION_3:
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CommandLine: '*/c*'
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SELECTION_4:
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CommandLine: '*assoc*'
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condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4)
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falsepositives:
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- Admin activity
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fields:
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- Image
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- CommandLine
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- User
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- LogonGuid
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- Hashes
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- ParentProcessGuid
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- ParentCommandLine
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id: 3d3aa6cd-6272-44d6-8afc-7e88dfef7061
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level: low
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logsource:
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category: process_creation
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product: windows
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modified: 2019/11/04
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1546.001/T1546.001.md
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status: experimental
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tags:
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- attack.persistence
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- attack.t1546.001
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- attack.t1042
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yml_filename: win_change_default_file_association.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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