Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to access directory listings on a web server via HTTP. It specifically looks for HTTP responses containing the string "Index of /" in the file data, which is a common indicator of an exposed directory listing. This exposure can allow attackers to discover sensitive files and directories on the server.
This rule detects HTTP requests attempting to access the AWS EC2 Instance Metadata service, specifically targeting the 'latest/meta-data' endpoint. This service, typically found at the IP address 169.254.169.254, provides information about the running EC2 instance, including credentials and other sensitive data. Unauthorized access to this endpoint can indicate an attacker attempting to gain further access or information within an AWS environment.
This rule detects the transmission of cleartext credentials over Telnet by looking for the string "Password:" in traffic flowing to the server on port 23. Telnet is an insecure protocol that sends data, including login credentials, in plain text, making it vulnerable to eavesdropping.
This rule detects the transmission of cleartext credentials over FTP by looking for the "PASS " string in network traffic flowing to an FTP server on port 21. This indicates that a password is being sent without encryption, which is a security risk.
SMB Authentication Brute Force
Suricata
This rule detects SMB authentication brute force attempts by looking for multiple NTLMSSP_AUTH messages over port 445 (SMB) from the same source IP within a 30-second window. A threshold of 10 attempts triggers the alert, indicating a potential brute force attack against SMB authentication.
This Suricata rule detects potential data exfiltration of password store information over HTTP. It specifically looks for HTTP POST requests where the client body contains both the words "password" and "username" (case-insensitive) and the body size is greater than 1000 bytes. This pattern suggests an attempt to send sensitive credential data from a compromised system to a remote server.
This rule detects the download of a Meterpreter reverse shell stage by looking for a specific byte sequence ('|fc e8 8f 00 00 00|') in TCP traffic flowing to the server on an established connection. This byte sequence is characteristic of the initial stage of a Meterpreter payload, which is often used for command and control.
Cobalt Strike DNS Beacon Pattern
Suricata
This rule detects a specific pattern associated with Cobalt Strike DNS beacons. It looks for HTTP requests where the URI contains '/updates' and the User-Agent header is 'Mozilla/4.0'. This combination of indicators is often used by Cobalt Strike for command and control communication.
This rule detects large HTTP POST requests containing GZIP compressed data (identified by the magic bytes '|1F 8B|') with a size greater than 100,000 bytes. This behavior is indicative of possible data staging or exfiltration, where an attacker might compress and upload sensitive data from a compromised system.
Confluence Wiki Bulk Export
Suricata
This rule detects HTTP requests to the '/spaces/exportspace.action' URI, which is associated with bulk export functionality in Confluence Wiki. This activity could indicate an attempt to exfiltrate data from a Confluence instance.
This rule detects a high volume of document downloads from SharePoint, specifically looking for repeated access to the `/_layouts/download.aspx` URI. A threshold of 30 downloads within 60 seconds from a single source IP address triggers the alert. This behavior could indicate an attempt to exfiltrate a large amount of data from SharePoint.
This rule detects attempts to drop executable files (.exe) into shared network folders (specifically those containing '\share\') over SMB (Server Message Block) protocol. This activity is indicative of an attacker attempting to move tools or malware laterally within a network.
This rule detects attempts to enumerate Docker containers via the Docker API. Specifically, it looks for HTTP requests to the '/containers/json' endpoint on TCP port 2375, which is commonly used for unauthenticated Docker API access. This activity is indicative of an adversary trying to discover running containers on a compromised host.
This rule detects a pattern indicative of ransomware encrypting files over SMB. It specifically looks for TCP traffic on port 445 (SMB) within the home network, containing the byte sequence '|FF|SMB'. A threshold of 500 such events from a single source IP within 30 seconds triggers the alert, classifying it as trojan activity.
XOR Encoded C2 Traffic Pattern
Suricata
This rule detects HTTP client body traffic that appears to be XOR encoded, characterized by a long sequence of non-printable ASCII characters (bytes 0x01-0x1f and 0x7f-0xff) of at least 50 characters. This pattern is often indicative of Command and Control (C2) communication used by malware to evade detection.
Bitsadmin Tool Transfer Download
Suricata
This rule detects the use of the 'bitsadmin' tool in HTTP user agent strings during a file transfer download. Bitsadmin is a legitimate Windows command-line tool used to create, manage, and monitor download and upload jobs, but it is frequently abused by adversaries for command and control, data transfer, and persistence.
This rule detects network reconnaissance activity by identifying HTTP requests where the User-Agent header contains the string "masscan". Masscan is a fast internet port scanner, and its User-Agent string often indicates scanning activity, which aligns with the MITRE ATT&CK technique T1595.002 for active scanning during reconnaissance.
This rule detects an SSH brute force attack by monitoring TCP connections to port 22 (SSH) on the home network. It triggers an alert if more than 20 TCP SYN packets are observed from a single source IP address within a 60-second window, indicating a high volume of connection attempts characteristic of a brute force.
This rule detects suspicious DNS lookups for 'pastebin.com'. It triggers an alert if a source IP performs 5 or more DNS queries for 'pastebin.com' within a 60-second window. This activity is often associated with reconnaissance, as attackers may use Pastebin to host command and control (C2) information, exfiltrated data, or other malicious content.
This rule detects unauthenticated access attempts to the Docker Daemon API, specifically targeting TCP port 2375. It triggers on the initial SYN packet of a TCP connection to this port, indicating an attempt to establish a connection to the Docker API without authentication. This activity is often associated with privilege escalation attempts, as an unauthenticated Docker API can be exploited to gain control over the host system.
This rule detects the creation of remote scheduled tasks over SMB by looking for the string "schtasks" in TCP traffic destined for port 445 (SMB). This activity is often associated with persistence techniques where attackers establish scheduled tasks on remote systems.
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