Suspicious File Download Through Nscurl - MacOS (via process_creation)

title: Suspicious File Download Through Nscurl - MacOS (via process_creation)
id: a4cb7867-08de-562c-ad2d-43d352468fc7
status: stable
description: This rule detects the execution of the nscurl utility to download files.
references:
    - https://attack.mitre.org/techniques/T1105/
    - https://www.loobins.io/binaries/nscurl/
    - https://www.agnosticdev.com/content/how-diagnose-app-transport-security-issues-using-nscurl-and-openssl
    - https://gist.github.com/nasbench/ca6ef95db04ae04ffd1e0b1ce709cadd
author: Huntrule Team
date: 2026-05-23
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        Image|endswith: '/nscurl'
        CommandLine|contains:
            - '--download '
            - '--download-directory '
            - '--output '
            - '-dir '
            - '-dl '
            - '-ld'
            - '-o '
    condition: selection
falsepositives:
    - Unknown
level: medium