Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects the presence of a common China Chopper web shell pattern in HTTP client body content. Specifically, it looks for the string "eval(base64_decode(" (case-insensitive) within HTTP requests flowing to the server. This pattern is characteristic of how China Chopper web shells execute commands on compromised web servers.
This rule detects HTTP traffic where the URI contains ".sct" (scriptlet) in a case-insensitive manner. This is indicative of an attempt to download a scriptlet, which can be used by MSHTA (Microsoft HTML Application host) for defense evasion, often to execute malicious code.
This rule detects potential phishing landing pages by looking for HTTP responses that contain both 'login' and 'microsoft' in the URI, and where the HTTP host is an IP address. This combination suggests an attempt to mimic a Microsoft login page hosted on an IP address rather than a legitimate domain, which is a common tactic in phishing attacks.
This rule detects attempts at SQL Injection using the 'UNION SELECT' statement within HTTP URI requests. It specifically looks for the case-insensitive string 'UNION SELECT' in the URI of HTTP traffic flowing to the server.
This rule detects the presence of a large Base64 encoded string (at least 100 characters) within the HTTP client body of network traffic. This pattern is often used by attackers to obfuscate malicious payloads, aligning with the MITRE ATT&CK technique T1027 for Defense Evasion.
This rule detects potential web shell access by looking for HTTP requests to PHP files that contain a 'cmd=' parameter in the URI. This pattern is commonly used by web shells to execute commands on a compromised web server, aligning with MITRE ATT&CK technique T1505.003 for web shell persistence.
This rule detects a password spraying attack targeting LDAP services. It triggers an alert if there are 50 or more TCP connections to port 389 (LDAP) on the home network within a 60-second window, originating from the same destination IP address. This pattern is indicative of an attacker attempting to authenticate with a small set of passwords against many accounts.
This rule detects internal Server Message Block (SMB) lateral movement attempts. It triggers when there are 10 or more SMB connections (identified by the "|FF|SMB" content signature) from a single source IP address to any destination on port 445 within a 60-second window, within the home network. This behavior is indicative of an attacker attempting to move laterally within a network using SMB.
This rule detects attempts to list processes via a web shell by looking for the string "tasklist" (case-insensitive) in the HTTP URI. This activity is indicative of an attacker using a compromised web server to gain information about the system, specifically process enumeration, which aligns with the MITRE ATT&CK technique T1057 (Process Discovery).
This rule detects potential Global Catalog LDAP enumeration attempts. It triggers when a source IP makes 10 or more TCP connections to destination port 3268 (the default port for Global Catalog LDAP) within a 60-second window. This behavior can indicate an attacker attempting to discover information about users, groups, and computers within an Active Directory environment.
This rule detects DNS queries for 'pastebin.com'. This activity is often associated with Command and Control (C2) communication, where attackers use services like Pastebin to host malicious code, configuration data, or receive commands. The rule triggers if 10 such queries are observed from the same source IP within a 300-second (5-minute) window, indicating potential C2 activity or data exfiltration attempts.
This rule detects TCP connections to port 8888, which is commonly used by Remote Access Trojans (RATs) for Command and Control (C2) communications. The rule specifically looks for the SYN flag in the TCP handshake, indicating the initiation of a new connection from the internal network ($HOME_NET) to any external destination.
This rule detects network connections to TCP port 4444, which is a commonly used default handler port for Metasploit, a popular penetration testing framework. The rule specifically looks for the initial SYN packet (flags:S) of a TCP connection from any source to any destination on port 4444 within the home network. This activity is often associated with command and control (C2) communication or reverse shells established by attackers using Metasploit.
This rule detects the download of executable files (such as .exe, .dll, .bat, .ps1, .vbs, .hta) over HTTP. It specifically looks for the 'MZ' header, which is characteristic of Windows executables, and checks the HTTP URI for common executable file extensions. This activity is often associated with initial access or command and control techniques where adversaries download malicious payloads.
This rule detects a high rate of DNS queries originating from a single source IP address within a specified time frame, which can be indicative of DNS Command and Control (C2) beaconing activity. Specifically, it triggers an alert if a source IP makes 50 or more DNS queries within a 60-second window. This behavior is often associated with malware attempting to communicate with a C2 server by encoding data within DNS requests or using DNS as a covert communication channel.
This rule detects potential audio stream exfiltration using the Real-time Transport Protocol (RTP). It specifically looks for UDP traffic with a packet size between 160 and 200 bytes, which is characteristic of some RTP audio streams. A threshold of 100 such packets from the same source within 10 seconds triggers the alert, indicating a sustained audio stream.
This rule detects the upload of a PNG image file over HTTP using a POST request. This could indicate an attacker exfiltrating screen captures, which aligns with MITRE ATT&CK technique T1113 (Screen Capture). The rule specifically looks for the HTTP POST method and the PNG file signature (89 50 4E 47) within the file data.
This rule detects a UDP flood Denial of Service (DoS) attack targeting the home network. It triggers an alert if more than 1000 UDP packets are observed from any source to any destination within the home network within a 5-second interval, tracked per destination.
This rule detects a TCP SYN Flood Denial of Service (DoS) attack. It triggers when a high volume of TCP SYN packets (1000 packets within 5 seconds) are observed targeting a single destination IP address within the HOME_NET, indicating an attempt to overwhelm the target's network resources.
This rule detects the exfiltration of encrypted archives over HTTP POST requests. It specifically looks for HTTP POST methods, the presence of file data, the 'PK' magic bytes indicating a ZIP or similar archive, and a file size greater than 50,000 bytes. This combination suggests an attempt to send a large, potentially encrypted, archive out of the network.
This rule detects network connections to TCP port 45700, which is a default port used by the XMRig cryptocurrency miner. The detection specifically looks for the initiation of a connection (SYN flag) from the internal network ($HOME_NET) to any external host. This activity is indicative of a system within the internal network potentially running an XMRig miner, which aligns with the MITRE ATT&CK technique T1496 (Resource Hijacking).
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