Detection rules › Sigma
Insecure Proxy/DOH Transfer Via Curl.EXE
Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
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
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\curl.exe'
- OriginalFileName: 'curl.exe'
Stage 2: selection_cli
selection_cli:
CommandLine|contains:
- '--doh-insecure'
- '--proxy-insecure'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|