sigmamediumHunting

Insecure Transfer Via Curl.EXE

Detects execution of "curl.exe" with the "--insecure" flag.

Detection Query

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

Author

X__Junior (Nextron Systems)

Created

2023-06-30

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://curl.se/docs/manpage.html

Tags

attack.execution

Raw Content

title: Insecure Transfer Via Curl.EXE
id: cb9cc1d1-e84e-4bdc-b7ad-c31b1b7908ec
status: test
description: Detects execution of "curl.exe" with the "--insecure" flag.
references:
    - https://curl.se/docs/manpage.html
author: X__Junior (Nextron Systems)
date: 2023-06-30
tags:
    - attack.execution
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:
    - Access to badly maintained internal or development systems
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_insecure_connection/info.yml