{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/openjs-foundation/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Elastic Defend","Microsoft Defender XDR","SentinelOne Cloud Funnel","Sysmon","Windows Security Event Logs"],"_cs_severities":["high"],"_cs_tags":["nodejs","execution","windows"],"_cs_type":"threat","_cs_vendors":["Elastic","Microsoft","SentinelOne","Crowdstrike","OpenJS Foundation"],"content_html":"\u003cp\u003eThis detection identifies suspicious Node.js execution patterns on Windows systems. Attackers may leverage Node.js, especially if it\u0026rsquo;s running from user-writable locations, to execute malicious code. The rule focuses on identifying instances where Node.js is executed from unusual paths like AppData, uses preload arguments (-r) potentially to inject malicious modules, or uses inline JavaScript execution techniques like \u003ccode\u003eeval\u003c/code\u003e, \u003ccode\u003eatob\u003c/code\u003e, or \u003ccode\u003echild_process\u003c/code\u003e to spawn other processes. The rule is designed to work with multiple data sources, including Elastic Defend, CrowdStrike, Microsoft Defender XDR, SentinelOne, Sysmon, and Windows Security Event Logs. This is important for defenders as malicious Node.js execution can lead to code injection, privilege escalation, and ultimately, system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eA user downloads or receives a malicious Node.js script, often disguised as a legitimate file.\u003c/li\u003e\n\u003cli\u003eThe script is saved to a user-writable directory such as the user\u0026rsquo;s AppData folder.\u003c/li\u003e\n\u003cli\u003eThe attacker executes \u003ccode\u003enode.exe\u003c/code\u003e from the AppData directory, specifying the malicious script as an argument.\u003c/li\u003e\n\u003cli\u003eAlternatively, PowerShell is used to launch Node.js with the \u003ccode\u003e-r\u003c/code\u003e argument to preload a malicious module, bypassing standard execution controls.\u003c/li\u003e\n\u003cli\u003eThe Node.js script uses the \u003ccode\u003eeval()\u003c/code\u003e or \u003ccode\u003eatob()\u003c/code\u003e functions to execute obfuscated code.\u003c/li\u003e\n\u003cli\u003eThe script leverages the \u003ccode\u003echild_process\u003c/code\u003e module to spawn a new process, such as \u003ccode\u003ecmd.exe\u003c/code\u003e or \u003ccode\u003epowershell.exe\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe spawned process executes malicious commands, potentially downloading additional payloads or establishing a reverse shell.\u003c/li\u003e\n\u003cli\u003eThe attacker gains unauthorized access to the system and performs malicious activities, such as data exfiltration or lateral movement.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful attack could lead to a complete compromise of the affected system. This includes the potential for data theft, installation of backdoors, and further propagation of the attack to other systems on the network. While the number of victims is not specified, the broad applicability of Node.js makes this a significant threat across various sectors.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the \u0026ldquo;Suspicious Execution with NodeJS\u0026rdquo; Sigma rule to your SIEM to detect the execution patterns described in this brief, tuning it for your specific environment.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events for \u003ccode\u003enode.exe\u003c/code\u003e executing from user-writable paths like \u003ccode\u003e\\Users\\*\\AppData\\*\u003c/code\u003e, as highlighted in the Sigma rule and attack chain.\u003c/li\u003e\n\u003cli\u003eInvestigate any instances of \u003ccode\u003enode.exe\u003c/code\u003e being launched with the \u003ccode\u003e-r\u003c/code\u003e argument by \u003ccode\u003epowershell.exe\u003c/code\u003e, as this indicates a potential module preload attack, which is covered in the Sigma rule.\u003c/li\u003e\n\u003cli\u003eReview command-line arguments for \u003ccode\u003enode.exe\u003c/code\u003e containing \u003ccode\u003eeval(\u003c/code\u003e, \u003ccode\u003eatob(\u003c/code\u003e, or \u003ccode\u003erequire*child_process*\u003c/code\u003e to identify potential inline code execution and child process spawning, as per the Sigma rule description.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"/briefs/2024-01-03-susp-nodejs-execution/","summary":"This rule detects suspicious Node.js execution patterns on Windows systems, including user-writable runtimes, preload arguments, and inline eval, decode, or child-process usage, indicating potential malicious activity.","title":"Suspicious Execution with NodeJS","url":"https://feed.craftedsignal.io/briefs/2024-01-03-susp-nodejs-execution/"}],"language":"en","title":"CraftedSignal Threat Feed — OpenJS Foundation","version":"https://jsonfeed.org/version/1.1"}