Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects suspicious command-line executions that attempt to create symbolic links to the `/etc/passwd` file. Attackers might do this to gain unauthorized access to user account information, potentially leading to credential dumping or privilege escalation. The rule specifically looks for `ln -s /etc/passwd` and `ln -s -f /etc/passwd` patterns in command lines.
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.
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.
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.
Detects the execution of the 'curl' command on Linux systems when it includes options to set a custom user agent. This behavior can be indicative of command and control communication or data exfiltration attempts where an adversary tries to mimic legitimate web traffic or evade detection by changing the default user agent string.
Detects changes to critical syslog daemon configuration files on Linux hosts. Adversaries may modify these files to disable or reconfigure logging, thereby impairing defenses and hindering the detection of their activities.
Detects attempts to exploit the Shellshock vulnerability (CVE-2014-6271) by looking for specific shellshock expressions in log files. These expressions are commonly used to inject and execute arbitrary commands.
Detects exploitation attempts related to the Nimbuspwn privilege escalation vulnerabilities (CVE-2022-29799 and CVE-2022-29800) on Linux systems. The rule looks for specific keywords that indicate the `networkd-dispatcher` service is being manipulated, potentially to execute arbitrary code with elevated privileges.
This rule detects a suspicious command sequence often associated with the JexBoss exploitation tool. Specifically, it looks for the execution of 'bash -c /bin/bash' followed by a network connection attempt using '&/dev/tcp/'. This combination indicates an attempt to establish a reverse shell or exfiltrate data over TCP.
Detects potential overwriting and deletion of a file using the 'dd' command. This rule specifically looks for executions of 'dd' where the output file ('of=') is specified and the input is either '/dev/zero' (writing zeros) or '/dev/null' (effectively truncating/deleting content). This pattern is commonly used for data destruction.
Detects the use of 'arp -a' or 'ping' commands targeting common private and loopback IP address ranges on Linux systems, which can indicate an adversary performing remote system discovery.
Detects attempts to force stop the Uncomplicated Firewall (ufw) using the 'ufw-init' script with the 'force-stop' argument, or disabling ufw using the 'ufw disable' command. This activity can indicate an adversary attempting to bypass host-based firewall controls to facilitate network communications for C2, lateral movement, or data exfiltration.
Detects the usage of the 'base64' utility with the decode flag ('-d' or '--decode') on Linux systems. This activity can indicate an adversary attempting to deobfuscate or decode base64-encoded text, which is a common technique for hiding malicious payloads or commands.
Detects the creation of a new named pipe using the "mkfifo" utility in a potentially suspicious location
Detects the enumeration of other remote systems.
Detects system information discovery commands
Detects usage of the "usermod" binary to add users add users to the root or suoders groups
Detects shellshock expressions in log files
Detects when the file "passwd" or "shadow" is copied from tmp path
Detects the use of grep to identify information about the operating system architecture. Often combined beforehand with the execution of "uname" or "cat /proc/cpuinfo"
Detects the creation of a new named pipe using the "mkfifo" utility
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