Curl Download And Execute Combination — Sigma Rule

Rule metadata and linked tags

Author: Sreeman, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2020-01-13 / 2024-03-05.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9febe7da7a7bb4206637136fd19903ab283c65d17aed78637e8b9b1154c1df9b

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Curl Download And Execute Combination
id: 21dd6d38-2b18-4453-9404-a0fe4a0cc288
status: test
description: Adversaries can use curl to download payloads remotely and execute them. Curl is included by default in Windows 10 build 17063 and later.
references:
    - https://medium.com/@reegun/curl-exe-is-the-new-rundll32-exe-lolbin-3f79c5f35983 # Dead Link
author: Sreeman, Nasreddine Bencherchali (Nextron Systems)
date: 2020-01-13
modified: 2024-03-05
tags:
    - attack.stealth
    - attack.t1218
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|windash: ' -c '
        CommandLine|contains|all:
            - 'curl '
            - 'http'
            - '-o'
            - '&'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://medium.com/@reegun/curl-exe-is-the-new-rundll32-exe-lolbin-3f79c5f35983