Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the execution of known exploit binaries or the compilation of source files associated with the Linux PACKET_EDIT_MEME exploit (CVE-2026-46331). The rule monitors for specific binary names associated with the exploit, execution of these binaries from common staging directories (/tmp, /dev/shm, /run), and the use of GCC or CC compilers to build the exploit source files.
Detects unauthorized access and command execution associated with MSP service accounts. The rule triggers on successful SSH authentication using specific service account names (e.g., egnyteservice) followed by the execution of interactive shells under those same service account contexts, which is indicative of potential lateral movement or compromise in downstream environments.
Detects signs of the VerdantBamboo threat actor's BRICKSTORM/PLENET campaign, specifically targeting Linux-based edge appliances like pfSense and Synology NAS. The rule monitors for sudo abuse by specific service accounts (e.g., egnyteservice, www-data) attempting to leverage NOPASSWD sudo privileges for the 'tee' utility to write malicious content into sensitive system files (e.g., /usr/sbin/, /etc/cron.d/, /etc/sudoers). Additionally, it identifies unauthorized sudo enumeration commands that may indicate early-stage reconnaissance or persistence efforts.
Detects the execution and download of the 'isp.sh' shell dropper and the 'lambsys' Go-based cryptominer binary on Linux systems. This rule monitors for common dropper patterns, including shell execution of piped commands, use of curl/wget to fetch known malicious components, and instances where Langflow processes attempt to spawn shell-related child processes for potential payload execution.
Detects host fingerprinting and geolocation activity performed by the Lambsys/procq cryptominer. The rule identifies processes like curl or wget querying external IP intelligence services (ipinfo.io, ip-api.com) when associated with suspicious binary paths or spawned by known miner processes.
Detects the use of the 'git commit --date' flag to manually set commit timestamps, a technique utilized by the IronWorm campaign to backdate malicious commits and manipulate repository history to appear benign or legacy-originating.
Detects post-exploitation activities related to the CVE-2026-45257 BUMSRAKETE vulnerability on FreeBSD. The rule monitors for kernel module loading using kldload from suspicious directories, kldstat execution, unauthorized root-level crontab modifications, and suspicious root-level shell execution spawned from non-standard parent processes, all of which indicate potential persistence or rootkit installation following a local privilege escalation.
Detects execution of the BUMSRAKETE exploit targeting the CVE-2026-45257 FreeBSD kTLS-RX page-cache corruption vulnerability. The rule identifies the exploit binary launching from a non-privileged context alongside the creation of staging files used to corrupt system binaries and escalate privileges to root.
Detects non-privileged execution of system commands (sysctl, freebsd-version, uname) used to query kernel parameters and system configuration. These actions serve as reconnaissance prerequisites for exploiting the BUMSRAKETE (CVE-2026-45257) local privilege escalation vulnerability on FreeBSD systems.
Detects multiple failed SSH login attempts from a single source IP address, indicating a potential brute force attack. The rule identifies 'Invalid user' or 'Failed password' messages in syslog from the 'sshd' process and groups them by source IP and time to count unique attempted users and total attempts. A threshold of more than 5 attempted users from a single source IP within a 10-minute window triggers an alert.
Detects evidence of Linux-based cryptomining malware, such as xmrig and associated droppers, along with their persistence mechanisms and efforts to disable system security controls (e.g., SELinux, AppArmor, ufw). The rule monitors process execution, file creation, cron job configuration, and modifications to system immutability locks via chattr.
Detects the modification or creation of Pluggable Authentication Module (PAM) files or shared libraries in Linux environments. This technique is often used to establish persistence or intercept authentication credentials by replacing legitimate modules like pam_unix.so with malicious counterparts.
Detects the 'Operation Highland' technique where an attacker-controlled binary named 'uptime' is executed by the 'fcgiwrap' process. This configuration acts as a FastCGI bridge, which subsequently spawns 'ssh' to establish unauthorized network connections into isolated network segments based on parameters received via HTTP POST requests.
Detects successful authentication for a user account immediately following a password change event. This pattern is indicative of a compromised PAM (Pluggable Authentication Modules) component or similar authentication backdoor that utilizes a hardcoded 'master' password to maintain access, bypassing credential rotation. This behavior is associated with the threat actor Velvet Ant (Operation Highland).
Detects execution of GS-Netcat covert C2 tunnels or masqueraded 'uptime' binaries running from non-standard system paths, consistent with persistent implants used by the Velvet Ant threat actor in Operation Highland.
Detects an internet-facing host in the DMZ that receives an inbound connection from an external non-RFC1918 address and subsequently authenticates to an internal RFC1918 host within a one-hour window. This behavior is indicative of a compromised DMZ host being used as a pivot point for lateral movement into the internal network.
This rule detects potentially suspicious modifications to Nginx configuration files or the usage of FastCGI directives such as fcgiwrap, fastcgi_pass, and proxy_pass. It specifically monitors for actions related to configuration changes (write, modify, create) or the establishment of backend communication via FastCGI parameters, which may indicate an attempt to gain remote code execution or persistence on a web server.
Detects malicious shell script execution on Linux edge/IoT devices associated with the JDY botnet exploitation of CVE-2026-35616. The rule identifies processes checking for MIPS-based architectures, using download utilities (wget, curl) for payload retrieval, and subsequent file deletion activity indicative of post-exploitation cleanup.
This rule detects successful SSH login attempts from external IP addresses (not within common private IP ranges). It specifically looks for 'Accepted' messages in syslog from the 'sshd' process and filters out internal source IPs.
This rule detects potential SSH brute force attacks by monitoring syslog for multiple failed SSH login attempts, connection closures, or invalid user attempts from a single source IP address within a short time frame. It specifically looks for keywords like 'error', 'Connection closed', 'authentication failure', and 'invalid user' in SSHD logs.
Detects the upload and execution of a specific malicious CSV file (evil_tenant.csv) on Cisco SD-WAN Manager (vManage) systems. This file is associated with exploitation of CVE-2026-20245, enabling attackers to inject a persistent root backdoor account into the system files.
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