Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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 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.
Detects the creation of files with a specific naming pattern '/mail/tmp/[a-zA-Z0-9]{3}[0-9]{3}.tar.gz' which has been observed to be used by the threat actor UNC4841 for staging and exfiltration of email-related data.
This rule detects the execution of the 'split' command on Linux systems. The 'split' command is used to break a file into smaller pieces, which can be a technique used by adversaries to bypass data transfer size limits during exfiltration or to make files easier to transfer.
Detects the presence of "bpf_probe_write_user" BPF helper-generated warning messages. Which could be a sign of suspicious eBPF activity on the system.
Detects a bash process initiating an outbound network connection to a remote IP address, which is a common indicator of a reverse shell. This rule specifically looks for '/bin/bash' processes making network connections, excluding connections to localhost or unspecified addresses.
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.
This rule detects the execution of the `nohup` command on Linux systems. `nohup` is a utility that allows a command to continue running in the background even after the user logs out or the terminal is closed. Attackers may leverage `nohup` to maintain persistence for malicious processes or to bypass restrictions in certain environments.
Detects an attempt to leverage the vulnerable servlet "mboximport" for an unauthenticated remote command injection in Zimbra Collaboration Suite Email Server, specifically targeting CVE-2022-27925. The rule looks for POST requests to the '/service/extension/backup/mboximport' endpoint with specific query parameters ('account-name', 'ow', 'no-switch', 'append') and then checks for subsequent requests to '/zimbraAdmin/*.jsp' with a 200 status code, indicating potential successful exploitation and web shell access.
Detects attempts to collect data stored in the clipboard from users using the 'xclip' tool. This rule specifically looks for the execution of 'xclip' with arguments indicating clipboard selection and output. It is highly recommended for server environments due to the frequent legitimate use of clipboard utilities on user workstations.
Detects exploitation attempts targeting CVE-2018-15473 in OpenSSH, specifically looking for a characteristic error message generated during the pre-authentication phase when an attacker attempts to enumerate valid usernames.
This rule detects the execution of common Linux commands used for system information discovery. Specifically, it looks for processes ending with '/uname', '/hostname', '/uptime', '/lspci', '/dmidecode', '/lscpu', and '/lsmod'. These commands are frequently used by adversaries to gather details about the operating system, hardware, and loaded modules on a compromised system.
This rule detects DNS queries for specific domains associated with the WannaCry ransomware killswitch. The presence of these queries indicates a potential WannaCry infection attempting to resolve its killswitch domain. If the domain resolves, the ransomware may cease its encryption activities.
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