Suspicious Insecure Proxy/DOH Transfer Through Curl.EXE (via process_creation)

title: Suspicious Insecure Proxy/DOH Transfer Through Curl.EXE (via process_creation)
id: ceeb5152-b405-504c-98f3-d4ec3aaa2c7a
status: stable
description: This rule detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.
references:
    - https://curl.se/docs/manpage.html
author: Huntrule Team
date: 2026-02-26
tags:
    - attack.execution
    - attack.command-and-control
    - attack.t1071
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\curl.exe'
        - OriginalFileName: 'curl.exe'
    selection_cli:
        CommandLine|contains:
            - '--doh-insecure'
            - '--proxy-insecure'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_insecure_proxy_or_doh/info.yml