{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/tags/socat/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["socat","execution","c2","macos","linux"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe 'socat' (multipurpose relay) utility is a powerful networking tool often abused by adversaries to establish bidirectional data channels, including reverse shells and C2 tunnels. When executed with the 'echo=0' flag, socat suppresses local terminal echo, a common technique used in malicious scripts to conceal interactive command execution and prevent sensitive data, such as passwords or command output, from being echoed to the local console or logged by terminal history. This behavior is particularly concerning when observed on macOS or Linux endpoints in conjunction with remote TCP, TCP4, TCP6, or OpenSSL sockets. Defenders should monitor for this process pattern as it may indicate an attacker establishing a stealthy remote access session or performing lateral movement across the internal network.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to a macOS or Linux endpoint.\u003c/li\u003e\n\u003cli\u003eAttacker downloads or identifies the presence of the legitimate 'socat' binary on the system.\u003c/li\u003e\n\u003cli\u003eAttacker constructs a command string incorporating 'echo=0' and connection parameters like 'tcp' or 'openssl'.\u003c/li\u003e\n\u003cli\u003eAttacker executes the socat command via an exploited process or terminal session.\u003c/li\u003e\n\u003cli\u003eThe utility establishes a connection to an attacker-controlled listener.\u003c/li\u003e\n\u003cli\u003eThe disabled local echo flag ensures that subsequent interactive input and output are not printed to the host terminal.\u003c/li\u003e\n\u003cli\u003eAttacker performs post-exploitation activities, such as credential theft or internal network scanning, over the encrypted or obscured tunnel.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful abuse of socat in this manner allows attackers to maintain stealthy, interactive remote access to compromised systems. This can lead to unauthorized data exfiltration, internal network reconnaissance, and the deployment of additional malicious tools, significantly increasing the risk of environment-wide compromise.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritize the investigation of socat executions that utilize the 'echo=0' flag.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided Sigma rule to detect socat executions with the specified command-line arguments.\u003c/li\u003e\n\u003cli\u003eEstablish a baseline for legitimate socat usage by administrators and developers in your environment to reduce false positives.\u003c/li\u003e\n\u003cli\u003eUtilize EDR or OSquery telemetry to inspect the parent process of any socat instance identified with these parameters, as anomalous parent-child relationships (e.g., web server processes spawning socat) are a primary indicator of compromise.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-07T04:41:34Z","date_published":"2026-09-07T04:41:34Z","id":"https://feed.craftedsignal.io/briefs/2026-09-socat-echo-disabled/","summary":"The socat utility is being identified in malicious contexts when used with local terminal echo disabled and configured for remote TCP or OpenSSL connections, often indicating C2 or lateral movement.","title":"Detection of Socat Usage for Stealthy Remote Connections","url":"https://feed.craftedsignal.io/briefs/2026-09-socat-echo-disabled/"}],"language":"en","title":"CraftedSignal Threat Feed - Socat","version":"https://jsonfeed.org/version/1.1"}