Suspicious React Server Child Process

Last updated a day ago on 2025-12-04
Created a day ago on 2025-12-04

About

This rule detects suspicious child process activity from a React server application. This could be related to successful exploitation of CVE-2025-55182 or CVE-2025-66478. These vulnerabilities allow attackers to execute remote code due to insecure deserialization of React Server Components (RSC) Flight payloads, leading to unauthenticated RCE on servers running React 19.x or Next.js 14.3.0-canary+, 15.x, and 16.x with the App Router enabled
Tags
Domain: EndpointOS: LinuxOS: macOSOS: WindowsUse Case: Threat DetectionTactic: Initial AccessData Source: Elastic DefendData Source: Auditd ManagerData Source: SentinelOneData Source: SysmonLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Initial Access (TA0001)(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
auditbeat-*logs-auditd_manager.auditd-*logs-endpoint.events.process*logs-sentinel_one_cloud_funnel.*logs-windows.sysmon_operational-*
Related Integrations

endpoint(opens in a new tab or window)

windows(opens in a new tab or window)

auditd_manager(opens in a new tab or window)

sentinel_one_cloud_funnel(opens in a new tab or window)

Query
process where event.type == "start" and event.action in ("exec", "executed", "process_started", "start", "ProcessRollup2") and
process.name in ("sh", "bash", "zsh", "curl", "wget", "id", "whoami", "uname", "cmd.exe", "cat", "powershell.exe") and
(
 ?process.working_directory : ("*react-dom*", "*.next*", "*node_modules/next*", "*react-server*", "*bin/next*", "*--experimental-https*", "*app/server*", "*.pnpm/next*", "*/app/*", "*next/dist/server*", "*react-scripts*") or
 
 (process.parent.name in ("node", "bun", "node.exe", "bun.exe") and
  process.parent.command_line : ("*react-dom*", "*.next*", "*node_modules/next*", "*react-server*", "*bin/next*", "*--experimental-https*", "*app/server*", "*.pnpm/next*", "*next start*", "*next dev*", "*react-scripts start*", "*next/dist/server*"))
 )

Install detection rules in Elastic Security

Detect Suspicious React Server Child Process 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).