Elastic Security Detection Rules

Curl SOCKS Proxy Activity from Unusual Parent

Last updated 20 days ago on 2024-11-04
Created 20 days ago on 2024-11-04

About

This rule detects the use of the `curl` command-line tool with SOCKS proxy options, launched from an unusual parent process. Attackers may use `curl` to establish a SOCKS proxy connection to bypass network restrictions and exfiltrate data or communicate with C2 servers.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: Command and ControlData Source: Elastic Defend
Severity
low
Risk Score
21
MITRE ATT&CK™

Command and Control (TA0011)(opens in a new tab or window)

↳ Protocol Tunneling (T1572)(opens in a new tab or window)

License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.*
Related Integrations

endpoint(opens in a new tab or window)

Query
process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
process.name == "curl" and (
  process.parent.executable like (
    "/dev/shm/*", "/tmp/*", "/var/tmp/*", "/var/run/*", "/root/*", "/boot/*", "/var/www/html/*", "/opt/.*"
  ) or
  process.parent.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
) and (
  process.args like ("--socks5-hostname", "--proxy", "--preproxy", "socks5*") or
  process.args == "-x" or 
  process.env_vars like ("http_proxy=socks5h://*", "HTTPS_PROXY=socks5h://*", "ALL_PROXY=socks5h://*")
)

Install detection rules in Elastic Security

Detect Curl SOCKS Proxy Activity from Unusual Parent in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).