{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/symbolic-link/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Splunk Enterprise","Splunk Enterprise Security","Splunk Cloud"],"_cs_severities":["high"],"_cs_tags":["privilege-escalation","symbolic-link","windows"],"_cs_type":"advisory","_cs_vendors":["Splunk"],"content_html":"\u003cp\u003eThe \u003ccode\u003esymboliclink-testing-tools\u003c/code\u003e toolkit, publicly available on GitHub, is leveraged to exploit Windows symbolic link vulnerabilities. This toolkit enables attackers to manipulate NTFS junctions, object manager symbolic links, and opportunistic locks (oplocks) to redirect file operations performed by privileged processes. This exploitation leads to local privilege escalation, allowing a standard user to gain SYSTEM privileges. These tools are typically used post-exploitation and are often utilized in scenarios where attackers have already gained initial access to a system. This threat matters because successful exploitation allows attackers to perform arbitrary actions with SYSTEM privileges, leading to complete system compromise, data theft, or the installation of malware.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to the target Windows system, typically through phishing or exploiting a remote vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker downloads or transfers the \u003ccode\u003esymboliclink-testing-tools\u003c/code\u003e toolkit to the compromised system.\u003c/li\u003e\n\u003cli\u003eThe attacker uses \u003ccode\u003eCreateNtfsSymlink.exe\u003c/code\u003e to create a symbolic link pointing to a sensitive system file or directory.\u003c/li\u003e\n\u003cli\u003eThe attacker utilizes \u003ccode\u003eSetOpLock.exe\u003c/code\u003e to set an opportunistic lock (oplock) on the target file, triggering a callback to the attacker-controlled process when the file is accessed.\u003c/li\u003e\n\u003cli\u003eA SYSTEM-level process attempts to access the original target file.\u003c/li\u003e\n\u003cli\u003eThe oplock triggers, allowing the attacker to intercept the file operation.\u003c/li\u003e\n\u003cli\u003eThe attacker redirects the privileged file operation to an arbitrary path, potentially overwriting or deleting critical system files.\u003c/li\u003e\n\u003cli\u003eThe attacker escalates privileges to SYSTEM due to the redirected privileged file operation, allowing arbitrary code execution.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of symbolic link vulnerabilities leads to local privilege escalation, granting attackers SYSTEM-level access. This can result in unauthorized access to sensitive data, installation of malware, and complete compromise of the affected system. The impact is high, especially in environments where least privilege principles are not strictly enforced. The compromise of even a single endpoint can provide an attacker with a foothold to move laterally within the network, impacting all connected systems.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eSymbolicLinkTestingToolsExecution\u003c/code\u003e to detect the execution of specific tools from the \u003ccode\u003esymboliclink-testing-tools\u003c/code\u003e toolkit and tune for your environment.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events (Sysmon EventID 1 or Windows Event Log Security 4688) for processes listed in the rule.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the Sigma rule, focusing on identifying the parent process and the user context of the executed tool.\u003c/li\u003e\n\u003cli\u003eImplement application control solutions to restrict the execution of unauthorized or unknown executables on endpoints to prevent the execution of the \u003ccode\u003esymboliclink-testing-tools\u003c/code\u003e utilities.\u003c/li\u003e\n\u003cli\u003eReview and enforce least privilege principles to minimize the impact of successful privilege escalation attempts, even if these tools are executed.\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-symboliclink-testing-tools/","summary":"The execution of utilities from the `symboliclink-testing-tools` toolkit is detected, which can be used by attackers to exploit Windows symbolic link vulnerabilities to achieve local privilege escalation from a standard user to SYSTEM.","title":"Execution of SymbolicLink-Testing-Tools Utility for Privilege Escalation","url":"https://feed.craftedsignal.io/briefs/2024-01-symboliclink-testing-tools/"}],"language":"en","title":"CraftedSignal Threat Feed — Symbolic-Link","version":"https://jsonfeed.org/version/1.1"}