Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects exploitation attempts against the Log4j RCE vulnerability, also known as Log4Shell (CVE-2021-44228). It looks for various JNDI (Java Naming and Directory Interface) lookup patterns, including LDAP, RMI, LDAPS, DNS, NIS, NDS, CORBA, and IIOP, as well as obfuscated forms of these patterns, which are commonly used to trigger the vulnerability. The rule specifically filters out known vulnerability scanning traffic from Nessus to reduce false positives.
Detects attempts to exploit the Grafana path traversal vulnerability (CVE-2021-43798) by looking for specific path traversal sequences combined with requests to known Grafana plugin directories that result in a successful HTTP status code (200).
This rule detects potential SQL injection attempts by looking for common SQL injection strings and keywords within the URI of GET requests in web server access logs. It specifically targets patterns often used to extract database information, bypass authentication, or execute arbitrary SQL commands.
This rule detects attempts to execute common Windows operating system commands via HTTP GET requests, which is a common characteristic of web shell activity. The rule specifically looks for URL-encoded versions of commands like 'whoami', 'net user', 'cmd /c', 'powershell', 'tasklist', 'wmic', 'ssh', 'python', 'ipconfig', 'wget', 'curl', 'certutil', 'copy \\', 'dsquery', and 'nltest'. These commands are often used by attackers to gain information about the compromised system, escalate privileges, or establish further persistence after deploying a web shell.
Detects exploitation attempts against the Log4j RCE vulnerability (CVE-2021-44228), commonly known as Log4Shell. The rule specifically looks for various JNDI injection patterns within web server log fields such as User-Agent, URI query, and Referer headers, which are common vectors for this vulnerability.
This rule detects suspicious sub-processes spawned by common web server processes on Linux systems. It specifically looks for web server processes (Apache, Nginx, Lighttpd, Node, Caddy, Tomcat, WebSphere) executing common system utilities and commands such as 'whoami', 'ifconfig', 'ip', 'uname', 'cat', 'crontab', 'hostname', 'iptables', 'netstat', 'pwd', and 'route'. This behavior is indicative of a web shell being used to execute commands on the compromised server.
Detects attempts to exploit Java-based web applications by identifying common payload strings often used in vulnerabilities like those affecting Confluence (CVE-2022-26134, CVE-2021-26084) and other Java deserialization or expression language injection flaws. The rule looks for specific patterns in web access logs that indicate the presence of Java code execution attempts, such as references to Java classes, runtime execution commands, and encoded characters often used in exploit payloads.
Detects HTTP requests to URIs ending with the ".class" extension. This can indicate attempts to download Java classes, potentially as part of exploitation attacks such as Log4shell against Log4j vulnerabilities. This rule is useful for threat hunting to identify such activities.
This rule detects HTTP requests containing user-agent strings commonly associated with known scanning and reconnaissance tools such as Wfuzz, WPScan, and Recon-ng. These tools are often used by attackers to gather information about web applications and infrastructure before launching an attack.
Detects the exploitation of the Wazuh RCE vulnerability described in CVE-2021-26814. This rule specifically looks for a URI query containing '/manager/files?path=etc/lists/../../../../..' which is indicative of a path traversal attempt to access sensitive files outside the intended directory.
Detects exploitation attempts against Citrix Netscaler, Application Delivery Controller (ADS), and Citrix Gateway by identifying specific URI query patterns associated with CVE-2020-8193 and CVE-2020-8195.
Detects exploitation attempts targeting CVE-2021-27905, an arbitrary file read and SSRF vulnerability affecting Apache Solr versions up to and including 8.8.1. The rule looks for specific patterns in HTTP request URIs that are indicative of this vulnerability being exploited, such as requests containing '/solr/', '/debug/dump?', 'param=ContentStream', or 'command=fetchindex' with 'masterUrl='.
Detects exploitation attempts of CVE-2021-41773, a path traversal vulnerability in Apache HTTP Server 2.4.49. This flaw allows an attacker to map URLs to files outside the expected document root, potentially leading to information disclosure (e.g., source code of CGI scripts) or arbitrary file access if not properly protected. This vulnerability has been actively exploited in the wild and specifically affects Apache HTTP Server version 2.4.49.
Detects a potential exploitation attempt of CVE-2023-25157, a SQL injection vulnerability in GeoServer. The rule looks for specific GET requests to '/geoserver/ows' containing 'CQL_FILTER=' along with known vulnerable functions or SQL injection keywords in the query string.
Detects exploitation attempts of the OWASSRF variant targeting Exchange servers. This exploit leverages the OWA endpoint to access the PowerShell backend endpoint, often associated with CVE-2022-41080 and CVE-2022-41082.
Detects Server-Side Template Injection (SSTI) attempts made via GET requests. The rule looks for common SSTI payload strings within the request, specifically excluding requests that result in a 404 Not Found status code to reduce false positives.
This rule detects attempts to inject Cross-Site Scripting (XSS) payloads via GET requests in web access logs. It specifically looks for common XSS strings and encoded variations within the request URL, such as '<script>', '<iframe>', '<svg>', 'document.cookie', 'document.domain', 'onerror=', 'onresize=', 'onload=', 'onmouseover=', '${alert', 'javascript:alert', and their URL-encoded forms. The rule filters out requests that result in a 404 HTTP status code to reduce false positives.
Detects access attempts to the SUPERNOVA webshell, specifically looking for requests to 'logoimagehandler.ashx' with 'clazz' in the query string, or requests to 'logoimagehandler.ashx' resulting in a 500 HTTP status code. This activity is indicative of an adversary interacting with a deployed webshell.
Detects an attempt to leverage the vulnerable servlet "mboximport" for an unauthenticated remote command injection in Zimbra Collaboration Suite Email Server, specifically targeting CVE-2022-27925. The rule looks for POST requests to the '/service/extension/backup/mboximport' endpoint with specific query parameters ('account-name', 'ow', 'no-switch', 'append') and then checks for subsequent requests to '/zimbraAdmin/*.jsp' with a 200 status code, indicating potential successful exploitation and web shell access.
This rule detects potential ReGeorg webshell activity by looking for specific query parameters in web server logs. It focuses on requests that contain 'cmd=read', 'connect&target', 'cmd=connect', 'cmd=disconnect', or 'cmd=forward' in the URI query string, combined with a null referrer and null user agent, and using the POST method. This combination of indicators is highly suspicious for webshell communication.
Detects exploitation attempts targeting Pulse Secure VPN appliances via CVE-2019-11510. Specifically, it looks for requests to a URI path containing '/dana/html5acc/guacamole/', which is indicative of an attacker attempting to access the Guacamole component of the Pulse Secure appliance.
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