46 lines
1.5 KiB
YAML
46 lines
1.5 KiB
YAML
title: Powershell Defender Exclusion
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author: Florian Roth
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date: 2021/04/29
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description: Detects requests to exclude files, folders or processes from Antivirus
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scanning using PowerShell cmdlets
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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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EventID: 1
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SELECTION_3:
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CommandLine: '*Add-MpPreference *'
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SELECTION_4:
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CommandLine: '* -ExclusionPath *'
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SELECTION_5:
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CommandLine: '* -ExclusionExtension *'
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SELECTION_6:
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CommandLine: '* -ExclusionProcess *'
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SELECTION_7:
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CommandLine: '*QWRkLU1wUHJlZmVyZW5jZ*'
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SELECTION_8:
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CommandLine: '*FkZC1NcFByZWZlcmVuY2*'
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SELECTION_9:
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CommandLine: '*BZGQtTXBQcmVmZXJlbmNl*'
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condition: (SELECTION_1 and ((SELECTION_2 and SELECTION_3 and (SELECTION_4 or
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SELECTION_5 or SELECTION_6)) or (SELECTION_7 or SELECTION_8 or SELECTION_9)))
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falsepositives:
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- Possible Admin Activity
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- Other Cmdlets that may use the same parameters
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id: 17769c90-230e-488b-a463-e05c08e9d48f
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level: high
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logsource:
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category: process_creation
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product: windows
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modified: 2021/07/12
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references:
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- https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/configure-process-opened-file-exclusions-microsoft-defender-antivirus
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md
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status: experimental
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tags:
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- attack.defense_evasion
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- attack.t1562.001
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yml_filename: win_powershell_defender_exclusion.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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