PowerShell Script With File Upload Capabilities — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: low. Source dates: 2022-01-07 / 2025-07-18.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "bade5735-5ab0-4aa7-a642-a11be0e40872"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 227a8809e5e4ec6a163a2cb4b8a9f18222b5ecae2739d4688accbeea907b9149

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

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

Original YAML and metadata in JSON

False positives

• Unknown

Source 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