Convert indexed Sigma rules into analyst-ready detections.
This studio is built around Phoenix's own rule corpus, not a blank editor. Search by title or rule id, choose a local pySigma backend, then reveal pipelines only when you actually need them.
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pySigma Versions
2
Newest: 2.0.1
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Active Rule
Curl File Upload To File Sharing Websites
Backends follow their supported pySigma version. Select 1.5.1 for Elasticsearch, Kusto, and other 1.x plugins.
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Curl File Upload To File Sharing Websites
Using Splunk · Default · pySigma 2.0.1
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
title: Curl File Upload To File Sharing Websites
id: e328cc73-f92a-42fb-b3fa-7c2cffda981a
related:
- id: 00bca14a-df4e-4649-9054-3f2aa676bc04
type: derived
- id: 7d1aaf3d-4304-425c-b7c3-162055e0b3ab
type: similar
status: experimental
description: Detects usage of curl to upload files to known file sharing domains, which may indicate data exfiltration.
author: Swachchhanda Shrawan Poudel (Nextron Systems)
references:
- https://unit42.paloaltonetworks.com/advanced-backdoor-squidoor/
date: 2026-03-29
tags:
- attack.exfiltration
- attack.t1567.002
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\curl.exe'
- OriginalFileName: 'curl.exe'
selection_cli_domain:
CommandLine|contains:
- '0x0.st'
- 'bashupload.com'
- 'chunk.io'
- 'file.io'
- 'filebin.net'
- 'pastebin'
- 'send.firefox.com'
- 'temp.sh'
- 'transfer.sh'
- 'ufile.io'
- 'uploadfiles.io'
- 'wetransfer.com'
- 'x0.at'
selection_cli_flags:
- CommandLine|contains:
- ' --form'
- ' --upload-file'
- ' --data'
- ' -X POST'
- ' --request POST '
- CommandLine|re:
- '\s-[FTd]\s' # We use regex to ensure a case sensitive argument detection
- '\s-sT\s'
condition: all of selection_*
falsepositives:
- Legitimate file uploads to these services by administrators or developers
level: high
CLI command
Sigma CLI 4.0.0 · Install matching versions, then run from the Phoenix project directory.
python -m pip install 'sigma-cli==4.0.0' 'pysigma==2.0.1' 'pysigma-backend-splunk==3.0.0'
sigma convert --without-pipeline -t splunk -f default 'sigma/rules/windows/process_creation/proc_creation_win_curl_upload_file_sharing_websites.yml'