4A616D6573
fdbdca003b
Broader rule for detecting web requests via various methods using Windows PowerShell, slightly crosses over the below rules but caters for different methods: https://github.com/Neo23x0/sigma/blob/99b15edf8add183543ca5738ec93f87416c34bd9/rules/windows/process_creation/win_powershell_download.yml https://github.com/Neo23x0/sigma/blob/0fa914139ca85966b49f0a8eda40a3f26608e86b/rules/windows/powershell/powershell_suspicious_download.yml
43 lines
1.5 KiB
YAML
43 lines
1.5 KiB
YAML
title: Windows PowerShell Web Request
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status: experimental
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description: Detects the use of various web request methods (including aliases) via Windows PowerShell
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references:
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- https://4sysops.com/archives/use-powershell-to-download-a-file-with-http-https-and-ftp/
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- https://blog.jourdant.me/post/3-ways-to-download-files-with-powershell
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author: James Pemberton / @4A616D6573
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date: 2019/10/24
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tags:
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- attack.execution
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- attack.t1059
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- attack.t1086
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logsource:
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category: powershell/sysmon
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product: windows
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definition: 'Recommended: Turn on PowerShell Script Block Logging = Enabled - see https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_logging_windows?view=powershell-6#enabling-script-block-logging'
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detection:
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eventcode:
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EventCode:
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- '1'
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- '4688'
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- '4104'
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powershell:
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ScriptBlockText:
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- '*Invoke-WebRequest*'
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- '*iwr *'
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- '*wget *'
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- '*curl *'
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- '*Net.WebClient*'
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- '*Start-BitsTransfer*'
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cmdsysmon:
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CommandLine:
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- '*Invoke-WebRequest*'
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- '*iwr *'
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- '*wget *'
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- '*curl *'
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- '*Net.WebClient*'
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- '*Start-BitsTransfer*'
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condition: eventcode and (powershell or cmdsysmon)
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falsepositives:
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- Use of Get-Command and Get-Help modules to reference Invoke-WebRequest and Start-BitsTransfer.
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level: medium
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