Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
2,132 detections
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Detects the creation or modification of a local NetScaler administrative account with superuser (nsroot-level) privileges via the appliance CLI or management API. This activity is indicative of persistent administrative backdoors potentially established after the exploitation of vulnerabilities such as CVE-2026-88771 or CVE-2026-88772.
Detects a multi-stage compromise sequence involving anomalous authentication followed by VPN session establishment and a burst of outbound connections from Citrix ADC/Gateway appliances. Tightened to reduce false positives from legitimate admin access, routine VPN sessions, and authorized appliance telemetry/updates.
Detects exploitation attempts against Microsoft SharePoint leveraging the ToolShell exploit chain, as well as subsequent post-exploitation webshell activity involving anomalous 'layoutNsp.aspx' naming conventions. This covers initial exploitation of vulnerabilities such as CVE-2025-49704 and associated variants, followed by the deployment of webshells associated with the ToolShell campaign.
Detects HTTP POST requests directed at Grav CMS endpoints where the __unique_form_id__ parameter contains directory traversal sequences (e.g., ../). This behavior is indicative of attempted exploitation of CVE-2026-42608, aimed at bypassing file system restrictions to write files to unauthorized locations outside the application's expected form data directory.
Detects potential exploitation attempts targeting unpatched Citrix NetScaler ADC or Gateway devices, specifically looking for unauthenticated requests to management or sensitive endpoints that contain command execution indicators. This rule is designed to identify activity associated with vulnerabilities similar to CVE-2026-88771.
Detects attempts to exploit a SharePoint vulnerability that involves bypassing SafeControls via quote-injection within the Register directive. The rule monitors POST requests to .aspx files for specific malicious patterns, including the use of 'ignoreParentFrozen' and malformed 'Register' tags that facilitate unauthorized code execution.
Detects incoming HTTP POST requests with unusually large payloads or malformed URI structures directed at Citrix NetScaler Gateway authentication endpoints, which are characteristic of exploitation attempts against CVE-2026-88771.
Detects core NetScaler service processes (nsppe, httpd, aslearning) initiating outbound network connections to external, non-private IP addresses. This behavior is indicative of post-exploitation C2 beaconing activity on a compromised NetScaler appliance.
Detects potential exploitation attempts targeting unpatched Citrix NetScaler ADC or Gateway devices, specifically looking for unauthenticated requests to management or sensitive endpoints that contain command execution indicators. This rule is designed to identify activity associated with vulnerabilities similar to CVE-2026-88771.
Detects anomalous process execution by PeopleSoft application server processes (e.g., psappsrv, jsvc) immediately following an inbound network request. This behavior is indicative of exploitation of a Java deserialization gadget chain, such as those used by the threat actor UNC6240 to achieve Remote Code Execution (RCE) and spawn command interpreters.
Detects the spawning of shells, network utilities, or scripting interpreters from Citrix NetScaler processes (nsppe or httpd), which may indicate post-exploitation activity following an initial access vulnerability.
Detects command-line activity on a NetScaler appliance indicative of defense evasion by truncating, deleting, or disabling audit logs (ns.log) and syslog forwarding services. This activity often follows the exploitation of public-facing application vulnerabilities where an attacker seeks to hide their presence.
Detects exploitation attempts against Microsoft SharePoint leveraging the ToolShell exploit chain, as well as subsequent post-exploitation webshell activity involving anomalous 'layoutNsp.aspx' naming conventions. This covers initial exploitation of vulnerabilities such as CVE-2025-49704 and associated variants, followed by the deployment of webshells associated with the ToolShell campaign.
Detects exploitation attempts against Microsoft SharePoint leveraging the ToolShell exploit chain, as well as subsequent post-exploitation webshell activity involving anomalous 'layoutNsp.aspx' naming conventions. This covers initial exploitation of vulnerabilities such as CVE-2025-49704 and associated variants, followed by the deployment of webshells associated with the ToolShell campaign.
Detects a potential web shell deployment by identifying a web server process creating or modifying a file in common web directory locations, followed shortly (within 10 minutes) by the execution of that same file.
Identifies NetScaler ADC or Gateway software versions in the inventory that are known to be vulnerable to CVE-2026-88771 and CVE-2026-88772, despite having received the patch for CVE-2026-19490.
Detects execution of shell commands containing obfuscated patterns (such as base64 decoding, hex character sequences, or piped commands) when spawned by core Citrix NetScaler service processes (nsppe, httpd, or nsaaad). This behavior is often indicative of exploitation attempts or post-exploitation activities on network appliances.
Detects anomalous web request patterns against Citrix NetScaler ADC or Gateway devices, characterized by excessively long URLs or request contexts combined with high-frequency parameter variation from a single source. This behavior is indicative of potential fuzzing or exploit attempts targeting web application vulnerabilities, specifically input validation flaws in edge infrastructure.
Detects web server processes (e.g., IIS w3wp.exe, Apache, Nginx, PHP-FPM) spawning suspicious child processes such as command shells (cmd, powershell, bash, sh), network utilities (curl, wget), or interpreters (python, perl). This behavior is strongly indicative of exploitation of a public-facing web application and the subsequent execution of a webshell or post-exploitation command activity.
This rule performs a retrospective search across device file and network events for indicators of compromise associated with the UNC6240/ShinyHunters actor's activity against PeopleSoft, specifically linked to CVE-2026-35273. It monitors for known malicious file hashes (JSP webshells and executables), connections to known C2 infrastructure, and DNS lookups for specific malicious domains.
Detects unauthorized attempts to access the Ray Dashboard Job Submission API, which is vulnerable to remote code execution (CVE-2023-48022). Attackers can leverage this API endpoint to execute arbitrary commands on the Ray cluster.
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