Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the creation of a new named pipe using the "mkfifo" utility in a potentially suspicious location, specifically within the /tmp/ directory. Named pipes can be used for inter-process communication and their creation in temporary directories might indicate malicious activity such as local privilege escalation or data exfiltration.
Detects the execution of the 'userdel' binary, which is used to delete a user account and associated files. This activity can be abused by threat actors to remove accounts, hindering forensic analysis and covering their tracks.
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 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.
This rule detects attempts to discover if a process is running inside a Docker container by listing or reading the '.dockerenv' file. Attackers often perform container discovery to understand their environment and plan subsequent actions. The rule specifically looks for common Linux utilities like 'cat', 'ls', 'find', 'dir', 'stat', 'test', or 'grep' being executed with '.dockerenv' in their command line arguments.
Detects the execution of 'wget' to download a '.tar' file from an untrusted direct IP address, specifically when the '--no-check-certificate' flag is used. This behavior has been observed in attacks attributed to UNC4841 during their exploitation of Barracuda ESG zero-day vulnerabilities.
Detects exceptions in the Velocity template renderer, which likely indicates dynamic rendering of user-controlled input. This vulnerability, known as Server-Side Template Injection (SSTI), can lead to Remote Code Execution (RCE) if successfully exploited.
This rule detects attempts to shut down or reboot a Linux system using common commands like 'shutdown', 'reboot', 'halt', 'poweroff', or by using 'init' or 'telinit' with specific runlevel arguments (0 for halt/shutdown, 6 for reboot). Adversaries may use these methods to disrupt system availability or aid in the destruction of data.
Detects the execution of binaries located in potentially suspicious locations, specifically within the '/tmp/' directory, using the 'nohup' command. This behavior is often associated with malware attempting to maintain execution even after a user logs off or a session terminates.
Detects executions of scripts located in potentially suspicious locations such as "/tmp" via a shell such as "bash", "sh", etc. This behavior is often associated with malware or adversaries attempting to execute payloads from temporary or user-writable directories.
This rule detects attempts to enumerate local network configuration on Linux systems. It specifically looks for the execution of common network utilities such as 'firewall-cmd', 'ufw', 'iptables', 'netstat', 'ss', 'ip', 'ifconfig', 'systemd-resolve', and 'route'. Additionally, it triggers if '/etc/resolv.conf' is present in the command line, indicating an attempt to inspect DNS resolver configuration.
Detects the execution of common network scanning or service enumeration tools like telnet, nmap, and netcat on Linux systems, as captured by auditd logs. This activity can indicate an adversary attempting to discover local or remote network services.
Detects commands that attempt to clear or tamper with the Linux command history. This technique is often used by threat actors to evade detection and execute commands without leaving a record in files like "bash_history" or "zsh_history". The rule specifically looks for various commands and patterns used to delete, truncate, or otherwise manipulate history files, as well as the specific log message "empty_bash_history" which can be generated by a provided monitoring script.
This rule detects outbound network connections to ngrok tunneling service endpoints. Ngrok is a legitimate tool that can be used to expose local servers to the internet, but it is also frequently leveraged by malicious actors for data exfiltration, command and control, and bypassing network restrictions. Detection of communication to these specific ngrok domains could indicate unauthorized use of the service for malicious purposes.
Detects the execution of 'openssl' with specific command-line arguments to connect to an IP address on ports 443 or 8080. This activity has been observed in campaigns by UNC4841 for SSL certificate exfiltration and as a C2 channel using named pipes. Further investigation of commands executed in the temporal vicinity of this activity is recommended.
Detects the execution of 'wget' to download compressed files ('.zip' or '.rar') from 'temp.sh'. This activity has been observed in attacks attributed to UNC4841, specifically during their exploitation of Barracuda ESG zero-day vulnerabilities.
Detects suspicious command-line activity on Linux systems where base64 encoded input is piped directly into a shell for execution. This technique is often used by adversaries for defense evasion and to obfuscate malicious commands.
Detects the execution of the Bash shell with the '-i' flag, which indicates an interactive shell. This is commonly used in reverse shells or other scenarios where an attacker wants to interact with the compromised system.
Detects attempts to collect data stored in the clipboard from users using the 'xclip' tool. This rule is particularly relevant for servers, where legitimate usage of clipboard utilities is less common than on user workstations. The rule specifically looks for the execution of 'xclip' with parameters '-sel', 'clip', and '-o', which are used to output the contents of the clipboard.
This rule detects command-line patterns indicative of reconnaissance activities on Linux systems, specifically searching for '.htpasswd' files which often contain credentials, and files with SUID/SGID permissions ('-perm -4000') which can be exploited for privilege escalation. These commands are commonly used by attackers to gather information about the system's configuration and potential credential storage locations.
This rule detects when an Nginx worker process crashes and generates a core dump, indicated by the log message 'exited on signal 6 (core dumped)'. This event can signify a serious underlying problem with the Nginx configuration, a plugin, or potentially an exploitation attempt targeting the Nginx server. Core dumps contain the memory state of the process at the time of the crash, which can be valuable for debugging but also sensitive if exposed.
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