39 lines
1.2 KiB
YAML
39 lines
1.2 KiB
YAML
title: Abusing Findstr for Defense Evasion
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author: Furkan CALISKAN, @caliskanfurkan_, @oscd_initiative
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date: 2020/10/05
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description: Attackers can use findstr to hide their artifacts or search specific
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strings and evade defense mechanism
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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: '*findstr*'
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SELECTION_3:
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CommandLine: '*/V*'
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SELECTION_4:
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CommandLine: '*/L*'
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SELECTION_5:
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CommandLine: '*/S*'
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SELECTION_6:
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CommandLine: '*/I*'
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condition: (SELECTION_1 and (SELECTION_2) and ((SELECTION_3 and SELECTION_4) or
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(SELECTION_5 and SELECTION_6)))
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falsepositives:
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- Administrative findstr usage
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id: bf6c39fc-e203-45b9-9538-05397c1b4f3f
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level: medium
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logsource:
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category: process_creation
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product: windows
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references:
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- https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSBinaries/Findstr.yml
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- https://oddvar.moe/2018/04/11/putting-data-in-alternate-data-streams-and-how-to-execute-it-part-2/
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- https://gist.github.com/api0cradle/cdd2d0d0ec9abb686f0e89306e277b8f
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status: experimental
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tags:
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- attack.defense_evasion
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- attack.t1218
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yml_filename: win_susp_findstr.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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