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38 lines
1.4 KiB
YAML
Executable File
38 lines
1.4 KiB
YAML
Executable File
title: In-memory PowerShell
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id: 092bc4b9-3d1d-43b4-a6b4-8c8acd83522f
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status: experimental
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description: Detects loading of essential DLL used by PowerShell, but not by the process powershell.exe. Detects meterpreter's "load powershell" extension.
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author: Tom Kern, oscd.community
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date: 2019/11/14
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modified: 2019/11/30
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references:
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- https://adsecurity.org/?p=2921
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- https://github.com/p3nt4/PowerShdll
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tags:
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- attack.t1086 # an old one
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- attack.t1059.001
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- attack.execution
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logsource:
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category: image_load
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product: windows
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detection:
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selection:
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ImageLoaded|endswith:
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- '\System.Management.Automation.Dll'
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- '\System.Management.Automation.ni.Dll'
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filter:
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Image|endswith:
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- '\powershell.exe'
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- '\powershell_ise.exe'
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- '\WINDOWS\System32\sdiagnhost.exe'
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- '\mscorsvw.exe' # c:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorsw.exe for instance
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- '\WINDOWS\System32\RemoteFXvGPUDisablement.exe' # on win10
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# User: 'NT AUTHORITY\SYSTEM' # if set, matches all powershell processes not launched by SYSTEM
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condition: selection and not filter
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falsepositives:
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- Used by some .NET binaries, minimal on user workstation.
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level: high
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enrichment:
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- EN_0001_cache_sysmon_event_id_1_info # http://bit.ly/314zc6x
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- EN_0003_enrich_other_sysmon_events_with_event_id_1_data # http://bit.ly/2ojW7fw
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