Suspicious Insecure Transfer Through Curl.EXE (via process_creation)

title: Suspicious Insecure Transfer Through Curl.EXE (via process_creation)
id: 8504ec6c-cbc8-5333-b706-8d45de48cbf6
status: stable
description: This rule detects execution of "curl.exe" with the "--insecure" flag.
references:
    - https://curl.se/docs/manpage.html
author: Huntrule Team
date: 2026-02-20
tags:
    - attack.execution
    - attack.command-and-control
    - attack.t1105
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\curl.exe'
        - OriginalFileName: 'curl.exe'
    selection_cli:
        - CommandLine|re: '\s-k\s'
        - CommandLine|contains: '--insecure'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_insecure_connection/info.yml