Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects post-exploitation activity related to the exploitation of PHP StreamBucket SOAP deserialization vulnerabilities. It monitors for child process execution from PHP web server processes (e.g., php-fpm, php.exe), the creation of specific proof-of-concept (PoC) marker files, and the presence of identified exploit script filenames on disk.
Detects anomalous activity consistent with the Velvet Ant 'Operation Highland' methodology, which leverages Nginx/FastCGI to bridge external requests to internal SSH execution. The rule monitors three conditions: 1) HTTP POST requests to internal endpoints containing SSH-related command parameters; 2) suspicious Nginx configuration modifications or reload events; and 3) spawning of SSH processes by FastCGI handlers. Findings are correlated by time and entity to identify potential persistence or lateral movement mechanisms.
Detects potential Server-Side Template Injection (SSTI) attacks targeting the Flocci API Gateway using Velocity Template Language (VTL). The rule monitors for malicious VTL patterns in network traffic, subsequent OS command execution, anomalous file creation indicating RCE, and IAM scope bypass patterns in cloud environment logs.
Detects Claude or Node-based AI coding agents spawning child processes (e.g., bash, python) to execute commands commonly associated with repository setup, environment configuration, or potential malicious activity (e.g., base64 decoding, network connections, shell spawning). This is intended to identify indirect prompt injection where an AI agent is manipulated into executing unauthorized commands.
Detects anomalous application crashes of network-oriented utilities (curl, git, sftp, etc.) that leverage libssh2. This pattern is indicative of a heap over-read vulnerability, such as CVE-2025-15661, triggered by a malicious SFTP server response during an outbound session.
This rule monitors Cisco SD-WAN environments for indicators of post-exploitation, including unauthorized SSH lateral movement, abuse of administrative tools (vshell, confd_cli), suspicious tenant list modifications related to CVE-2026-20245, privilege escalation to backdoor accounts, system file tampering (/etc/passwd, /etc/shadow), and anti-forensic activities such as log and history deletion.
This rule detects indicators of exploitation for CVE-2026-20245 in Cisco Catalyst SD-WAN Manager. It monitors for the upload of malicious tenant configuration files, the creation of unauthorized 'troot' administrative accounts, subsequent lateral movement via 'su', modifications to critical system authentication files like /etc/passwd or /etc/shadow, and post-exploitation configuration exfiltration via REST API endpoints.
Detects successful SSH authentication to administrative accounts ('vmanage-admin' or 'admin') on Cisco Catalyst SD-WAN Manager (vManage) devices originating from IP addresses associated with the threat actor UAT-8616. This activity relates to exploits targeting CVE-2026-20127 and CVE-2026-20182 for unauthorized access via authentication bypass or certificate abuse.
This rule detects the modification or creation of sensitive Linux files often used for persistence, such as cron job configurations, system boot scripts, and custom system tools. It monitors for file writing and process execution events involving specific paths and filenames identified as associated with persistence mechanisms or monitoring tools.
Detects potential privilege escalation and unauthorized file modification by the 'egnyteservice' account. The rule monitors Syslog for sudo usage involving the 'tee' utility with 'NOPASSWD' configuration, or suspicious writes to critical system directories such as /usr/sbin/ and /etc/cron.d/, which are indicative of VerdantBamboo threat actor activity on edge appliances.
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.
Detects instances where the fcgiwrap or spawn-fcgi processes, commonly used for Nginx FastCGI handling, are observed spawning system utility binaries (such as uptime, id, ps, who, or hostname) from unconventional locations like /tmp, /var/tmp, /dev/shm, or /home. This behavior is associated with the Velvet Ant threat group for lateral movement and reconnaissance within segmented networks.
Detects the execution of GS-Netcat or GSSocket, known tools used by the Velvet Ant threat group to establish encrypted C2 tunnels and SOCKS proxies on Linux systems. The rule identifies suspicious command-line patterns, including secret keys (-s), listener configurations (-l -p), and shell redirection (-e), particularly when executed from volatile directories like /tmp/ or /dev/shm/.
Detects abnormal termination, crash, or error messages related to the 'sharingd' process on macOS. 'sharingd' is a daemon responsible for various sharing features including AirDrop, Handoff, and Instant Hotspot. Unexpected errors or crashes within this process may indicate service instability, potential exploitation attempts, or abnormal interactions with sharing services.
This rule detects potential SSH brute force attacks by identifying high-frequency authentication failures from sshd logs (more than 10 failures in 5 minutes) and rapid, potentially automated connection attempts on port 22 (more than 20 connections in 1 minute) originating from the same source IP on Linux systems.
This rule detects suspicious activity on Linux systems including unauthorized modification of SSH authorized_keys, creation of unauthorized system accounts (e.g., 'troot'), manipulation of critical system files like /etc/passwd or /etc/shadow, and the execution of specific suspicious scripts or commands indicative of an exploit or post-exploitation activity.
Detects reconnaissance and post-exploitation activity associated with the exploitation of the libssh2 CVE-2026-55200 vulnerability. The rule identifies the execution of known libpwn PoC binaries, libssh2-dependent client applications (curl, git, php) spawning unexpected shell processes, and unauthorized access to SSH-related configuration or key files by non-interactive processes.
This rule detects potential credential harvesting activities by monitoring for suspicious environment variable enumeration or unauthorized access to sensitive credential and configuration files (such as AWS credentials and .env files) by common command-line utilities. It is designed to identify post-compromise reconnaissance where an adversary attempts to extract cloud provider or AI API keys.
Detects the exploitation of a vulnerability in the SimpleHelp OIDC authentication flow where an attacker can register a forged technician account and self-register MFA during the first login, effectively bypassing mandatory multi-factor authentication requirements. The detection looks for specific sequences in server logs involving OIDC attribute fetching and 'New Anon' technician registration tags.
This rule detects potential exploitation of the CVE-2026-48558 vulnerability in SimpleHelp servers by monitoring for specific sequences of log markers related to authentication bypass and unauthorized configuration changes. It flags anomalous technician registrations, OIDC attribute fetching, and 'New Anon' configuration saves within a 60-second window, which are indicative of an attacker attempting to gain unauthorized access or manipulate session security.
Detects potential container escape attempts via 'docker cp' path traversal attacks or suspicious shell execution spawned from the Docker daemon. The rule monitors for directory traversal sequences in 'docker cp' commands, the use of PoC tooling strings, file modifications outside expected container paths, and shell process spawning originating from Docker-related parent processes.
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