Insecure Proxy/DOH Transfer Via Curl.EXE

Description

Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.

Query · sigma

selection_img:
- Image|endswith: \curl.exe
- OriginalFileName: curl.exe
selection_cli:
  CommandLine|contains:
  - --doh-insecure
  - --proxy-insecure
condition: all of selection_*

Known false positives

  • Access to badly maintained internal or development systems
Raw source Insecure Proxy/DOH Transfer Via Curl.EXE · Sigma
Esc
Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Insecure Proxy/DOH Transfer Via Curl.EXE
id: 2c1486f5-02e8-4f86-9099-b97f2da4ed77
status: test
description: Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.
references:
    - https://curl.se/docs/manpage.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-07-27
tags:
    - attack.execution
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:
    - Access to badly maintained internal or development systems
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_insecure_proxy_or_doh/info.yml

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