Curl

Adversaries frequently abuse the legitimate curl command-line utility to exfiltrate collected sensitive data to external Command and Control (C2) servers via network protocols.

This brief details the detection of Linux processes utilizing `curl` to contact known public IP address lookup web services, a common post-exploitation technique employed by malware and adversaries to ascertain a host's internet-facing IP, impacting reconnaissance and command-and-control tailoring.

A high-severity threat involves the abuse of `curl.exe` on Windows systems to download potentially malicious files from various public file-sharing and content delivery network (CDN) domains, a technique observed in campaigns by threat actors such as FIN7, leading to further system compromise.

Adversaries may abuse Curl for Windows to download files or upload data to a remote URL for command and control or exfiltration purposes.

Multiple vulnerabilities in cURL could allow an attacker to bypass security measures, disclose confidential information, or manipulate data.

A remote, anonymous attacker can exploit a vulnerability in cURL to manipulate files on a vulnerable system.

Detection of Node.js directly or via a shell spawning curl or wget, potentially indicating command and control behavior where adversaries download tools or payloads onto the system.

This rule detects potential data exfiltration attempts on Linux systems using the curl command-line tool to upload files to external servers, potentially indicating unauthorized data transfer.