Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects large HTTP POST requests (over 5MB) directed at external hosts that utilize multipart or chunked encoding, which are commonly used to obfuscate or stream large volumes of data during an exfiltration event.
Detects HTTP beaconing activity indicative of Cobalt Strike Malleable C2 communication. The rule monitors for specific URI patterns ('/updates', '/pixel', '/submit.php') in combination with a default User-Agent string commonly used by Cobalt Strike malleable profiles.
Detects network exploitation attempts related to the Log4j vulnerability (CVE-2021-44228), where an adversary sends an HTTP request containing a JNDI lookup string (e.g., ldap://, rmi://, dns://) designed to trigger a remote code execution via vulnerable Log4j libraries.
Detects repeated RDP connection attempts to port 3389 from a single source within a short timeframe, characteristic of brute force or password spraying activity. The rule monitors for consecutive TLS ClientHello or MCS Connect-Initial packets.
Detects common SQL injection attack patterns within HTTP URI or POST body traffic, such as UNION SELECT, tautologies (e.g., OR 1=1), schema enumeration, and database functions like benchmark or sleep.
Detects high-frequency TCP SYN scanning behavior targeting Telnet (port 23) and SSH (port 22) ports, characteristic of Mirai botnet propagation and reconnaissance activities.
Detects the use of the HTTP CONNECT method on non-standard ports (8888, 9999, 4444). The CONNECT method is frequently used by HTTP proxies to establish TCP tunnels; unauthorized use of this method on uncommon ports is a common indicator of protocol tunneling used to bypass network egress filtering or for command and control (C2) communication.
Detects outbound HTTP POST requests with specific URI patterns (/rob/ or /ins/) that are indicative of TrickBot malware command and control (C2) check-in activity.
Detects DNS query traffic where the subdomain label length exceeds 50 characters and contains patterns consistent with Base64 or Hexadecimal encoding. This behavior is indicative of potential data exfiltration or command-and-control communication performed over the DNS protocol by tunneling data within query labels.
This rule detects common Cross-Site Scripting (XSS) patterns within the HTTP URI, specifically looking for script tags, javascript: URI handlers, and common event handlers (onerror/onload) that are frequently used in XSS injection attacks.
This rule monitors incoming HTTP requests for classic SQL injection patterns, such as UNION SELECT, SLEEP, BENCHMARK, and various SQL commands like DROP or ALTER. These signatures are commonly associated with attempts to gain unauthorized access to database contents, exfiltrate data, or compromise the database integrity via web applications.
Detects SMB authentication attempts using NTLM with a blank Lan Manager (LM) hash. This specific pattern is often associated with Pass-the-Hash attacks where tools inject malformed or blank hashes to initiate authentication, a common indicator of lateral movement attempts.
This rule detects multiple Network Level Authentication (NLA) negotiation attempts targeting port 3389 from a single source within a 60-second window, which is indicative of an RDP brute-force attack.
Detects high-frequency DNS query patterns characterized by long, potentially encoded, subdomain labels (exceeding 40 characters) that are indicative of DNS-based command and control (C2) beaconing activity.
Detects outbound ICMP Type 8 (Echo Request) packets that contain an abnormally large payload (greater than 64 bytes). This behavior is characteristic of ICMP tunneling, where attackers encapsulate data within the payload of ICMP packets to bypass network security controls or establish covert command and control communication.
Detects attempts to exploit Apache Struts vulnerabilities by identifying OGNL (Object-Graph Navigation Language) expressions (starting with %{ or ${) within the Content-Type HTTP header, combined with requests to .action or .do endpoints.
Detects common XSS attack patterns within HTTP URI requests, specifically monitoring for script tags or event handler attributes such as 'onerror' and 'onload' which are used to execute malicious JavaScript in a user's browser.
Detects network traffic consistent with the Metasploit Meterpreter reverse HTTPS payload, specifically looking for the default 'CN=metasploit' certificate subject name used by the framework in SSL/TLS handshakes, or connections targeting default Meterpreter ports like 4444.
Detects the initial handshake communication pattern associated with AsyncRAT, characterized by a specific base64-encoded configuration blob sent to external non-standard ports (6606, 7707, 8808) as identified by the Snort rule logic.
This rule detects potential bulk data exfiltration by monitoring for outbound HTTP POST requests to non-standard ports where the Content-Length header indicates a transfer of over 10 megabytes. This behavior can be indicative of an attacker exfiltrating large amounts of sensitive data from the network to an external server.
Detects outbound FTP STOR (Store) commands directed to external networks. This indicates that a host inside the local network is attempting to upload data to an external server. The rule uses a threshold to filter out isolated commands, triggering when 3 or more STOR commands are detected within 120 seconds, which is characteristic of data exfiltration or staging behavior.
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