67 lines
2.0 KiB
YAML
67 lines
2.0 KiB
YAML
title: Suspicious Scripting in a WMI Consumer
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author: Florian Roth, Jonhnathan Ribeiro
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date: 2019/04/15
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description: Detects suspicious scripting in WMI Event Consumers
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detection:
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SELECTION_1:
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EventID: 19
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SELECTION_10:
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Destination: '* iex(*'
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SELECTION_11:
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Destination: '*WScript.shell*'
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SELECTION_12:
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Destination: '* -nop *'
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SELECTION_13:
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Destination: '* -noprofile *'
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SELECTION_14:
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Destination: '* -decode *'
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SELECTION_15:
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Destination: '* -enc *'
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SELECTION_16:
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Destination: '*WScript.Shell*'
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SELECTION_17:
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Destination: '*System.Security.Cryptography.FromBase64Transform*'
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SELECTION_2:
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EventID: 20
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SELECTION_3:
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EventID: 21
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SELECTION_4:
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Destination: '*new-object*'
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SELECTION_5:
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Destination: '*net.webclient*'
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SELECTION_6:
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Destination: '*.downloadstring*'
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SELECTION_7:
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Destination: '*new-object*'
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SELECTION_8:
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Destination: '*net.webclient*'
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SELECTION_9:
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Destination: '*.downloadfile*'
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condition: ((SELECTION_1 or SELECTION_2 or SELECTION_3) and ((SELECTION_4 and
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SELECTION_5 and SELECTION_6) or (SELECTION_7 and SELECTION_8 and SELECTION_9)
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or (SELECTION_10 or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14
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or SELECTION_15) or (SELECTION_16 or SELECTION_17)))
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falsepositives:
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- Administrative scripts
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fields:
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- User
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- Operation
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id: fe21810c-2a8c-478f-8dd3-5a287fb2a0e0
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level: high
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logsource:
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category: wmi_event
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product: windows
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modified: 2021/09/01
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references:
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- https://in.security/an-intro-into-abusing-and-identifying-wmi-event-subscriptions-for-persistence/
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- https://github.com/Neo23x0/signature-base/blob/master/yara/gen_susp_lnk_files.yar#L19
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- https://github.com/RiccardoAncarani/LiquidSnake
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status: experimental
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tags:
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- attack.t1086
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- attack.execution
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- attack.t1059.005
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yml_filename: sysmon_wmi_susp_scripting.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/wmi_event
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