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PowerShell Script With File Upload Capabilities

Detects PowerShell scripts leveraging the "Invoke-WebRequest" cmdlet to send data via either "PUT" or "POST" method.

MITRE ATT&CK

exfiltration

Detection Query

selection_cmdlet:
  ScriptBlockText|contains:
    - Invoke-RestMethod
    - Invoke-WebRequest
    - "irm "
    - "iwr "
selection_flag:
  ScriptBlockText|contains:
    - -Method "POST"
    - -Method "PUT"
    - -Method POST
    - -Method PUT
    - -Method 'POST'
    - -Method 'PUT'
condition: all of selection_*

Author

frack113

Created

2022-01-07

Data Sources

windowsps_script

Platforms

windows

References

Tags

attack.exfiltrationattack.t1020

Raw Content

title: PowerShell Script With File Upload Capabilities
id: d2e3f2f6-7e09-4bf2-bc5d-90186809e7fb
status: test
description: Detects PowerShell scripts leveraging the "Invoke-WebRequest" cmdlet to send data via either "PUT" or "POST" method.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1020/T1020.md
    - https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
    - https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/invoke-webrequest?view=powershell-7.4
author: frack113
date: 2022-01-07
modified: 2025-07-18
tags:
    - attack.exfiltration
    - attack.t1020
logsource:
    product: windows
    category: ps_script
    definition: bade5735-5ab0-4aa7-a642-a11be0e40872
detection:
    selection_cmdlet:
        ScriptBlockText|contains:
            - 'Invoke-RestMethod'
            - 'Invoke-WebRequest'
            - 'irm '
            - 'iwr '
    selection_flag:
        ScriptBlockText|contains:
            - '-Method "POST"'
            - '-Method "PUT"'
            - '-Method POST'
            - '-Method PUT'
            - "-Method 'POST'"
            - "-Method 'PUT'"
    condition: all of selection_*
falsepositives:
    - Unknown
level: low